CVE-2026-98586 (GCVE-0-2026-98586)
Vulnerability from cvelistv5
Published
2026-10-18 15:18
Modified
2026-10-19 09:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: hold asoc or transport before mod_timer() in timer handlers Take the association or transport reference before rearming a timer in the timer handlers. The existing code calls mod_timer() before taking the reference needed by the rearmed timer without holding the sock lock. This creates a race with timer cleanup: if the timer is deleted after mod_timer() returns but before the reference is taken, the cleanup path can drop the timer's reference and destroy the transport or association. The timer handler then takes a reference on the already freed object and eventually drops it, causing a refcount underflow. Hold the object before mod_timer() and drop the reference if mod_timer() reports that the timer was already pending in timer handlers. Apply the same ordering to the proto-unreachable path, which can rearm a transport timer outside the timer handlers without holding the sock lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: hold asoc or transport before mod_timer() in timer handlers\n\nTake the association or transport reference before rearming a timer in the\ntimer handlers.\n\nThe existing code calls mod_timer() before taking the reference needed by\nthe rearmed timer without holding the sock lock. This creates a race with\ntimer cleanup: if the timer is deleted after mod_timer() returns but before\nthe reference is taken, the cleanup path can drop the timer\u0027s reference and\ndestroy the transport or association. The timer handler then takes a\nreference on the already freed object and eventually drops it, causing a\nrefcount underflow.\n\nHold the object before mod_timer() and drop the reference if mod_timer()\nreports that the timer was already pending in timer handlers. Apply the\nsame ordering to the proto-unreachable path, which can rearm a transport\ntimer outside the timer handlers without holding the sock lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:22:11.899Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/f7dea7eaea20fe9b80f8f77ba44d02b4a17f8050"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9d929026d487a988bfa12c065f892e823e5b6ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d3d39da054476e7aa05cd877b93ca73a9a77434"
        },
        {
          "url": "https://git.kernel.org/stable/c/27c51a9b55b227309161c903f9ecfbf022516bc2"
        },
        {
          "url": "https://git.kernel.org/stable/c/d18cb8fd1b6ba95c85de644203cfe1b071ff0c0f"
        },
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          "url": "https://git.kernel.org/stable/c/35bf3b23c9a871f44c1453d85f8332be4e088dda"
        },
        {
          "url": "https://git.kernel.org/stable/c/cae23ae3f7887a1cf8a75da38edcebeef695040f"
        }
      ],
      "title": "sctp: hold asoc or transport before mod_timer() in timer handlers",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98586",
    "datePublished": "2026-10-18T15:18:59.046Z",
    "dateReserved": "2026-09-25T10:25:14.358Z",
    "dateUpdated": "2026-10-19T09:22:11.899Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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