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sctp: stream: fully roll back denied add-stream state

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: stream: fully roll back denied add-stream state When ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path. Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp_stream_outq_migrate(), and then reschedule the remaining streams. This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions.

Announced Source revision 1
Original source ↗

CVE-2026-52929

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-2026-52929

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": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "a6724b7b812ac8793514a1d5938db5d9d29ae725",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "9662eb0401518f0b4681f10e7fbf688f504f24cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "7dd9a42b044aad2dbe037db1c1e2943582485b44",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "39dc2b0eb5371a669ebc9ec6072b9184eac95418",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "d5ea0b3e261fcb2cfff142675516165244cab1da",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "1c6773b8c081509dcd5cd2954f2b02c50c00f151",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "637784ade221a3c8a7ecd0f583eddd95d6276b9a",
        "lessThan": "a5f8a90ac9f77c678a9781c0a464b635e0d63e49",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sctp/stream.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sctp/stream.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-52929

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40698 · Revision 1
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Publisher date
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