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  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* TuxCare ELS build of the Debian 11 (bullseye) 5.10.262 kernel\n     (x86_64/aarch64/armel).\n   * Reconstructed on the newer bullseye-security 5.10.262-1 base (rolls up\n     upstream stable 5.10.260 / .261 / .262), replacing the prior 5.10.259-1\n     base. Debian patch set re-imported as git commits (ip6_vti patch dropped —\n     now upstream; firmware log-message patch refreshed).\n   * Single-source: embed the linux-latest + linux-signed meta packages into the\n     source tree (debian/meta/) so one dpkg-buildpackage run produces the\n     versioned kernel AND the meta/signed packages.\n   * ABI: this ELS changelog entry increments the gencontrol-computed abiname\n     5.10.0-46 -> 5.10.0-47, so the ELS kernel ships as linux-image-5.10.0-47-*,\n     a distinct, co-installable package vs Debian stock 5.10.0-46.\n   * Disable the rt and cloud featuresets/flavours (not shipped by ELS).\n   * Fix the duplicate pinned image/headers meta on signed arches under\n     disable-signed: gate the pinned-meta emission on raw signed-code so only the\n     embed's fallback meta (linux-image-5.10.0-47-amd64 | ...-unsigned) ships.\n   * Backport security fixes for potentially-exploited (KCARE 0/1-day) CVEs:\n     CVE-2026-46113 (KVM x86 shadow-paging UAF, unexpected GFN/role),\n     CVE-2026-64561 (KVM x86: check obsolete root after making MMU pages\n     available),\n     CVE-2026-64564 (SCTP ASCONF DEL-IP transport use-after-free),\n     CVE-2026-64600 (XFS: resample data-fork mapping after cycling ILOCK).\n   * Drop the prior CVE-2026-43499 (rtmutex remove_waiter UAF) and\n     CVE-2026-46331 (net/sched pedit partial-COW) backports — both are included\n     upstream in the 5.10.260 / .261 / .262 stable roll-up.",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787918353",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787918353"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/advisories/2026/clsa-2026_1787918353.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-08-28T12:00:49Z",
      "generator": {
        "date": "2026-08-28T12:00:49Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1787918353",
      "initial_release_date": "2026-08-28T12:00:49Z",
      "revision_history": [
        {
          "date": "2026-08-28T12:00:49Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-46113, CVE-2026-64561, CVE-2026-64564, CVE-2026-64600"
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        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Check for invalid/obsolete root *after* making MMU pages available\n\nCheck for a \"stale\" page fault, i.e. for an invalid and/or obsolete root,\nafter making MMU pages available for the shadow MMU.  If reclaiming shadow\npages zaps an in-use root, i.e. marks it invalid, then KVM will attempt to\nmap memory into an invalid root.  On its own, populating an invalid root is\n\"fine\", but because child shadow pages inherit their parent's role, any\nchildren created during the map/fetch will be created as invalid pages,\nthus violating KVM's invariant that invalid pages are never on the list of\nactive MMU pages.\n\nNote, the underlying flaw has existed since KVM first started tracking\ninvalid roots in 2008 (commit 2e53d63acba7, \"KVM: MMU: ignore zapped root\npagetables\"), but the true badness only came along in 2020 (Linux 5.9)\nwith the invariant that invalid shadow pages can't be on the list of\nactive pages.\n\nNote #2, inheriting role.invalid when creating child shadow pages is also\nfar from ideal; that flaw will be addressed separately.",
          "title": "Vulnerability description"
        }
      ],
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        "name": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
      },
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: resample the data fork mapping after cycling ILOCK\n\nxfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode,\na data fork mapping, and a cow fork mapping.  Unfortunately, these two\nhelpers cycle the ILOCK to grab a transaction, which means that the\nmappings are stale as soon as we reacquire the ILOCK.  Currently we\nrefresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but\nwe don't refresh the data fork mapping beforehand, which means that the\nxfs_bmap_trim_cow in that function queries the refcount btree about the\nwrong physical blocks and returns an inaccurate value in *shared.\n\nIf *shared is now false, the directio write proceeds with a stale data\nfork mapping.  Fix this by querying the data fork mapping if the\nsequence counter changes across the ILOCK cycle.",
          "title": "Vulnerability description"
        }
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            "Debian-11:linux-perf-5.10-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-source-0:5.10.262-1+tuxcare.els1.all",
            "Debian-11:linux-source-5.10-0:5.10.262-1+tuxcare.els1.all",
            "Debian-11:linux-support-5.10.0-47-0:5.10.262-1+tuxcare.els1.all"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787918353"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-64564",
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: don't free the ASCONF's own transport in DEL-IP processing\n\nsctp_process_asconf() caches the transport the ASCONF chunk is processed\nagainst in asconf->transport (== chunk->transport, set once in sctp_rcv()).\nFor an ASCONF located through its Address Parameter by\n__sctp_rcv_asconf_lookup(), that cached transport corresponds to the\nAddress Parameter, which need not be the packet's source address.\n\nsctp_process_asconf_param() rejects a DEL-IP for the packet source address\n(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.\nA single ASCONF can therefore carry, in order:\n\n    [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]\n\nwhere L differs from the source. The DEL-IP for L passes the D8 check and\ncalls sctp_assoc_rm_peer() on the transport that asconf->transport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf->transport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (->ipaddr, ->state) and plants the dangling pointer into\nasoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping\nonly the pointer that is no longer on the list, removes every real\ntransport, leaving the association with a transport_count of 0 and\nprimary_path/active_path pointing at freed memory.\n\nReject a DEL-IP that targets the transport the ASCONF is being processed\nagainst, mirroring the existing source-address guard, so the wildcard\nbranch can never reuse a freed transport.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "fixed": [
          "Debian-11:bpftool-0:5.10.262-1+tuxcare.els1.amd64",
          "Debian-11:hyperv-daemons-0:5.10.262-1+tuxcare.els1.amd64",
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          "Debian-11:linux-source-5.10-0:5.10.262-1+tuxcare.els1.all",
          "Debian-11:linux-support-5.10.0-47-0:5.10.262-1+tuxcare.els1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-64564"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/2b324ba3494ae958cba16a453e3e71489b4de7fc",
          "url": "https://git.kernel.org/stable/c/2b324ba3494ae958cba16a453e3e71489b4de7fc"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603",
          "url": "https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b",
          "url": "https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f",
          "url": "https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/a63afa1f9b12d5293cbe0b77fd45dc0632533a13",
          "url": "https://git.kernel.org/stable/c/a63afa1f9b12d5293cbe0b77fd45dc0632533a13"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293",
          "url": "https://git.kernel.org/stable/c/a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462",
          "url": "https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740",
          "url": "https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740"
        },
        {
          "category": "external",
          "summary": "https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564",
          "url": "https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/06/13",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/06/13"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/06/3",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/06/3"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/06/4",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/06/4"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/07/1",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/07/1"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/07/2",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/07/2"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/07/8",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/07/8"
        }
      ],
      "release_date": "2026-08-04T07:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-28T11:59:16.792120Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1787918353",
          "product_ids": [
            "Debian-11:bpftool-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:hyperv-daemons-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:libcpupower-dev-0:5.10.262-1+tuxcare.els1.amd64",
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            "Debian-11:linux-compiler-gcc-10-x86-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-config-5.10-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-cpupower-0:5.10.262-1+tuxcare.els1.amd64",
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            "Debian-11:linux-headers-5.10.0-47-common-0:5.10.262-1+tuxcare.els1.all",
            "Debian-11:linux-headers-amd64-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-image-5.10.0-47-amd64-unsigned-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-image-amd64-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-image-amd64-signed-template-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-kbuild-5.10-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-libc-dev-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-perf-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-perf-5.10-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-source-0:5.10.262-1+tuxcare.els1.all",
            "Debian-11:linux-source-5.10-0:5.10.262-1+tuxcare.els1.all",
            "Debian-11:linux-support-5.10.0-47-0:5.10.262-1+tuxcare.els1.all"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787918353"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-46113",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Fix shadow paging use-after-free due to unexpected GFN\n\nThe shadow MMU computes GFNs for direct shadow pages using sp->gfn plus\nthe SPTE index. This assumption breaks for shadow paging if the guest\npage tables are modified between VM entries (similar to commit\naad885e77496, \"KVM: x86/mmu: Drop/zap existing present SPTE even\nwhen creating an MMIO SPTE\", 2026-03-27).  The flow is as follows:\n\n- a PDE is installed for a 2MB mapping, and a page in that area is\n  accessed.  KVM creates a kvm_mmu_page consisting of 512 4KB pages;\n  the kvm_mmu_page is marked by FNAME(fetch) as direct-mapped because\n  the guest's mapping is a huge page (and thus contiguous).\n\n- the PDE mapping is changed from outside the guest.\n\n- the guest accesses another page in the same 2MB area.  KVM installs\n  a new leaf SPTE and rmap entry; the SPTE uses the \"correct\" GFN\n  (i.e. based on the new mapping, as changed in the previous step) but\n  that GFN is outside of the [sp->gfn, sp->gfn + 511] range; therefore\n  the rmap entry cannot be found and removed when the kvm_mmu_page\n  is zapped.\n\n- the memslot that covers the first 2MB mapping is deleted, and the\n  kvm_mmu_page for the now-invalid GPA is zapped.  However, rmap_remove()\n  only looks at the [sp->gfn, sp->gfn + 511] range established in step 1,\n  and fails to find the rmap entry that was recorded by step 3.\n\n- any operation that causes an rmap walk for the same page accessed\n  by step 3 then walks a stale rmap and dereferences a freed kvm_mmu_page.\n  This includes dirty logging or MMU notifier invalidations (e.g., from\n  MADV_DONTNEED).\n\nThe underlying issue is that KVM's walking of shadow PTEs assumes that\nif a SPTE is present when KVM wants to install a non-leaf SPTE, then the\nexisting kvm_mmu_page must be for the correct gfn.  Because the only way\nfor the gfn to be wrong is if KVM messed up and failed to zap a SPTE...\nwhich shouldn't happen, but *actually* only happens in response to a\nguest write.\n\nThat bug dates back literally forever, as even the first version of KVM\nassumes that the GFN matches and walks into the \"wrong\" shadow page.\nHowever, that was only an imprecision until 2032a93d66fa (\"KVM: MMU:\nDon't allocate gfns page for direct mmu pages\") came along.\n\nFix it by checking for a target gfn mismatch and zapping the existing\nSPTE.  That way the old SP and rmap entries are gone, KVM installs\nthe rmap in the right location, and everyone is happy.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "fixed": [
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          "Debian-11:hyperv-daemons-0:5.10.262-1+tuxcare.els1.amd64",
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          "Debian-11:linux-image-amd64-0:5.10.262-1+tuxcare.els1.amd64",
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          "Debian-11:linux-source-5.10-0:5.10.262-1+tuxcare.els1.all",
          "Debian-11:linux-support-5.10.0-47-0:5.10.262-1+tuxcare.els1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-46113"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/06c19c967b845b63172601fe459667d973b7e6b7",
          "url": "https://git.kernel.org/stable/c/06c19c967b845b63172601fe459667d973b7e6b7"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/0cb2af2ea66ad8ff195c156ea690f11216285bdf",
          "url": "https://git.kernel.org/stable/c/0cb2af2ea66ad8ff195c156ea690f11216285bdf"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/14d1e55dfd2cf4711bff164a6aaaddb783552134",
          "url": "https://git.kernel.org/stable/c/14d1e55dfd2cf4711bff164a6aaaddb783552134"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/488e386484ec8c0e558be6e156edf34ed9f4d5c8",
          "url": "https://git.kernel.org/stable/c/488e386484ec8c0e558be6e156edf34ed9f4d5c8"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/738ec97b1855df6c08fe2369f798fa0b972e556b",
          "url": "https://git.kernel.org/stable/c/738ec97b1855df6c08fe2369f798fa0b972e556b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e9d4ea13aa2b6400bb10ec64b370ba3dadcd22f0",
          "url": "https://git.kernel.org/stable/c/e9d4ea13aa2b6400bb10ec64b370ba3dadcd22f0"
        }
      ],
      "release_date": "2026-05-28T09:35:23Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-28T11:59:16.792120Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1787918353",
          "product_ids": [
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            "Debian-11:linux-headers-amd64-0:5.10.262-1+tuxcare.els1.amd64",
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            "Debian-11:linux-image-amd64-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-image-amd64-signed-template-0:5.10.262-1+tuxcare.els1.amd64",
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            "Debian-11:linux-perf-0:5.10.262-1+tuxcare.els1.amd64",
            "Debian-11:linux-perf-5.10-0:5.10.262-1+tuxcare.els1.amd64",
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            "Debian-11:linux-source-5.10-0:5.10.262-1+tuxcare.els1.all",
            "Debian-11:linux-support-5.10.0-47-0:5.10.262-1+tuxcare.els1.all"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787918353"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}