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sctp: clear control chunk transport if it is being removed

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport.

Announced Source revision 1
Original source ↗

CVE-2026-74688

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-2026-74688

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": [
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "fad4766a74220fe579c6fcaa10ba01c23529814f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "936658ec41c28c397ef390140e02d4c91ade92f0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "8de65194a04d2552cd39b6c67d942d490f22d174",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "6160e756db81d6cb63e3e2952efcf6c5134be385",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "18d704bdd809377dfd81a3c2f42426763b5da227",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a07eb0a50aebc8c95478d49c28c7f8419a26cef",
        "lessThan": "c9158ceaf27780ef64534ad72f44ffde3f8ccc49",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sctp/associola.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sctp/associola.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74688

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#34271 · Revision 1
Added to Heist Feed
Publisher date
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