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CVE-2026-89771 ring-buffer: Fix subbuf resize race with ring buffer readers

🗓️ 11 Sep 2026 19:47:10Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 45 Views

Race in Linux kernel ring-buffer: subbuf_size read lockless during concurrent resize.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/trace/ring_buffer.c"
    ],
    "versions": [
      {
        "version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b",
        "lessThan": "6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b",
        "lessThan": "50f4a793c4ff24826efb0ac700989a5063cc53df",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b",
        "lessThan": "0c7c517827a453128a8f58bfd849546a29813b27",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b",
        "lessThan": "8a5f63637890f03177146efddaba5ec7a1b4d61f",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/trace/ring_buffer.c"
    ],
    "versions": [
      {
        "version": "6.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.8",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.109",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.50",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2.4",
        "lessThanOrEqual": "7.2.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.3",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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19 Oct 2026 08:52Current
CVSS 3.17.8
EPSS0.0012
45