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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.",
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        "summary": "Canonical URL",
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          "date": "2025-06-18T10:15:00Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Annotate FDB data races\n\nThe 'used' and 'updated' fields in the FDB entry structure can be\naccessed concurrently by multiple threads, leading to reports such as\n[1]. Can be reproduced using [2].\n\nSuppress these reports by annotating these accesses using\nREAD_ONCE() / WRITE_ONCE().\n\n[1]\nBUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit\n\nwrite to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0:\n vxlan_xmit+0xb29/0x2380\n dev_hard_start_xmit+0x84/0x2f0\n __dev_queue_xmit+0x45a/0x1650\n packet_xmit+0x100/0x150\n packet_sendmsg+0x2114/0x2ac0\n __sys_sendto+0x318/0x330\n __x64_sys_sendto+0x76/0x90\n x64_sys_call+0x14e8/0x1c00\n do_syscall_64+0x9e/0x1a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nread to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2:\n vxlan_xmit+0xadf/0x2380\n dev_hard_start_xmit+0x84/0x2f0\n __dev_queue_xmit+0x45a/0x1650\n packet_xmit+0x100/0x150\n packet_sendmsg+0x2114/0x2ac0\n __sys_sendto+0x318/0x330\n __x64_sys_sendto+0x76/0x90\n x64_sys_call+0x14e8/0x1c00\n do_syscall_64+0x9e/0x1a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nvalue changed: 0x00000000fffbac6e -> 0x00000000fffbac6f\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014\n\n[2]\n #!/bin/bash\n\n set +H\n echo whitelist > /sys/kernel/debug/kcsan\n echo !vxlan_xmit > /sys/kernel/debug/kcsan\n\n ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1\n bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1\n taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &\n taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &",
          "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-2025-38037"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7",
          "url": "https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/13cba3f837903f7184d6e9b6137d5165ffe82a8f",
          "url": "https://git.kernel.org/stable/c/13cba3f837903f7184d6e9b6137d5165ffe82a8f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/4eceb7eae6ea7c950384c34e6dbbe872c981935f",
          "url": "https://git.kernel.org/stable/c/4eceb7eae6ea7c950384c34e6dbbe872c981935f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/784b78295a3a58bf052339dd669e6e03710220d3",
          "url": "https://git.kernel.org/stable/c/784b78295a3a58bf052339dd669e6e03710220d3"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1",
          "url": "https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/a6644aeb8ddf196dec5f8e782293c36f065df4d7",
          "url": "https://git.kernel.org/stable/c/a6644aeb8ddf196dec5f8e782293c36f065df4d7"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e033da39fc6abbddab6c29624acef80757f273fa",
          "url": "https://git.kernel.org/stable/c/e033da39fc6abbddab6c29624acef80757f273fa"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612",
          "url": "https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
        }
      ],
      "release_date": "2025-06-18T10:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-01T16:05:30.902495Z",
          "details": "This issue is a KCSAN-reported data race on non-security‑critical “used/updated” fields in the VXLAN FDB, and the upstream change merely annotates these accesses (READ_ONCE/WRITE_ONCE), indicating no memory corruption, privilege escalation, or confidentiality/integrity impact. Triggering it practically requires local code execution and a deliberately configured VXLAN interface with static FDB entries—conditions that are not present by default and generally need elevated networking capabilities to set up or drive. Consequently, the risk is confined to a narrow, local availability disturbance on hosts actively running VXLAN overlays, making this a low‑priority item in centrally managed server/VM environments.",
          "product_ids": [
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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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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}