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sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START The SCTP_CMD_TIMER_START handler checks timer_pending() before calling timer_reduce(). The timer can expire and detach between these operations, causing timer_reduce() to rearm the timer without taking the association reference required for the newly armed timer. The timer callback later unconditionally drops its association reference, which can leave the association reference count unbalanced and result in use-after-free during association teardown. Use the return value of timer_reduce() to determine whether the timer was actually armed. Take the association reference only when timer_reduce() successfully starts a new timer, closing the race between checking the timer state and rearming it. This issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero Day Initiative.

Announced Source revision 1
Original source ↗

CVE-2026-98130

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98130

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
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        "status": "affected",
        "version": "20a785aa52c82246055a089e55df9dac47d67da1",
        "lessThan": "cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "versionType": "git"
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        "versionType": "git"
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        "status": "affected",
        "version": "085bb270b4b1168c93afb37bbafc881207d15443",
        "versionType": "git"
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        "status": "affected",
        "version": "4.19.126",
        "lessThan": "4.20",
        "versionType": "semver"
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    ],
    "programFiles": [
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    ],
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  },
  {
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    "vendor": "Linux",
    "product": "Linux",
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        "version": "5.7"
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        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
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        "version": "5.10.271",
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        "lessThanOrEqual": "5.10.*"
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        "version": "5.15.222",
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        "version": "6.1.189",
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        "lessThanOrEqual": "6.1.*"
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        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
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        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
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        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sctp/sm_sideeffect.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98130

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38225 · Revision 1
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Publisher date
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