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        "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"
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        "summary": "Canonical URL",
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          "date": "2026-05-01T13:55:59Z",
          "number": "1",
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          "date": "2026-08-25T12:53:53Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp: Don't attempt to copy CSR to userspace if PSP command failed\n\nWhen retrieving the PEK CSR, don't attempt to copy the blob to userspace\nif the firmware command failed.  If the failure was due to an invalid\nlength, i.e. the userspace buffer+length was too small, copying the number\nof bytes _firmware_ requires will overflow the kernel-allocated buffer and\nleak data to userspace.\n\n  BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n  BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n  BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n  Read of size 2084 at addr ffff898144612e20 by task syz.9.219/21405\n\n  CPU: 14 UID: 0 PID: 21405 Comm: syz.9.219 Tainted: G     U     O        7.0.0-smp-DEV #28 PREEMPTLAZY\n  Tainted: [U]=USER, [O]=OOT_MODULE\n  Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120\n   print_address_description ../mm/kasan/report.c:378 [inline]\n   print_report+0xbc/0x260 ../mm/kasan/report.c:482\n   kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595\n   check_region_inline ../mm/kasan/generic.c:-1 [inline]\n   kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200\n   instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n   _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n   _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n   copy_to_user ../include/linux/uaccess.h:236 [inline]\n   sev_ioctl_do_pek_csr+0x31f/0x590 ../drivers/crypto/ccp/sev-dev.c:1872\n   sev_ioctl+0x3a4/0x490 ../drivers/crypto/ccp/sev-dev.c:2562\n   vfs_ioctl ../fs/ioctl.c:51 [inline]\n   __do_sys_ioctl ../fs/ioctl.c:597 [inline]\n   __se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583\n   do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   </TASK>\n\nWARN if the driver says the command succeeded, but the firmware error code\nsays otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any\nfirwmware error.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-31699"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/0fb87e44b81385f940b482cba5b3f0bd18fb8185",
          "url": "https://git.kernel.org/stable/c/0fb87e44b81385f940b482cba5b3f0bd18fb8185"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/111dcc6d0f016076745824a787d25609d0022f4c",
          "url": "https://git.kernel.org/stable/c/111dcc6d0f016076745824a787d25609d0022f4c"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/372116eece159adff631b1508344c8b85ebf9559",
          "url": "https://git.kernel.org/stable/c/372116eece159adff631b1508344c8b85ebf9559"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3b4fd8f15765d9a3105b834dba8a05d025e5e16e",
          "url": "https://git.kernel.org/stable/c/3b4fd8f15765d9a3105b834dba8a05d025e5e16e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/502d10a1d9d477e6c7fc7021a2dac7018f4ab8b5",
          "url": "https://git.kernel.org/stable/c/502d10a1d9d477e6c7fc7021a2dac7018f4ab8b5"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/59e9ae81f8670ccc780bc75f45a355736f640ec9",
          "url": "https://git.kernel.org/stable/c/59e9ae81f8670ccc780bc75f45a355736f640ec9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/607ba280f2adb5092cf5386c3935afac2ca0031a",
          "url": "https://git.kernel.org/stable/c/607ba280f2adb5092cf5386c3935afac2ca0031a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/abe4a6d6f606113251868c2c4a06ba904bb41eed",
          "url": "https://git.kernel.org/stable/c/abe4a6d6f606113251868c2c4a06ba904bb41eed"
        }
      ],
      "release_date": "2026-05-01T13:55:59Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-06T12:25:27.564783Z",
          "details": "Deprioritize: this bug is confined to AMD SEV host provisioning code and is only reachable via the SEV_PEK_CSR ioctl on the /dev/sev device, which requires local code with write access to that node; guest VMs use /dev/sev-guest and do not traverse this path. The issue results in an out-of-bounds read that can crash the kernel but offers no remote vector or privilege escalation. In typical enterprise VM/server footprints, this narrow, hardware‑specific, local‑only path makes practical exploitation unlikely.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          "details": "Moderate"
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}