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sctp: prevent peer transport count overflow

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: prevent peer transport count overflow sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero. SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail. Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit.

Announced Source revision 1
Original source ↗

CVE-2026-74469

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-2026-74469

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": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "b453e00da1211e997b82743d28af7714c59c05c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "dfea32dd76f390e3155177b0038cc47b01386198",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "80f48523a0fe42db2e7375dff4e38a25c117090a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "546221b86ceeba0d8fec92d46a0604bb7b62be07",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "09e722030e8148ba4ed1e42c6b2ea57bda9f9895",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
        "lessThan": "bd0e9289e2642f6a5c54faad304ce0f41e926d22",
        "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": "4.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.7",
        "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": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "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-2026-74469

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33163 · Revision 1
Added to Heist Feed
Publisher date
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