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sctp: fix uninit-value in __sctp_rcv_asconf_lookup()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: fix uninit-value in __sctp_rcv_asconf_lookup() __sctp_rcv_asconf_lookup() in net/sctp/input.c only checks that the ASCONF chunk can hold the ADDIP header and a parameter header, then calls af->from_addr_param(), which reads the full address (16 bytes for IPv6) trusting the parameter's declared length. An unauthenticated peer can send a truncated trailing ASCONF chunk that declares an IPv6 address parameter but stops after the 4-byte parameter header; reached from the no-association lookup path, from_addr_param() then reads uninitialized bytes past the parameter. Impact: an unauthenticated SCTP peer makes the receive path read up to 16 bytes of uninitialized memory past a truncated ASCONF address parameter. The sibling __sctp_rcv_init_lookup() bounds parameters with sctp_walk_params(); this path open-codes the fetch and omits the bound. Verify the whole address parameter lies within the chunk before from_addr_param() reads it, the same class of fix as commit 51e5ad549c43 ("net: sctp: fix KMSAN uninit-value in sctp_inq_pop").

Announced Source revision 1
Original source ↗

CVE-2026-53225

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-2026-53225

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "df21857714398acb8b24a8bb5a6d2286dd9c59ef",
        "lessThan": "446e0ecd845abc394b24ae2030a883572bec9d16",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef",
        "lessThan": "928dd94db23e8ba340f83d68f7f24d831b7a4426",
        "versionType": "git"
      },
      {
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        "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef",
        "lessThan": "d796cfd06074b579d265b28401306cadd30db945",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef",
        "lessThan": "8ce96f1182644079249a24ac7e2ffc32e0301a46",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "d6bd0bb7697ea8c0387b0d9d973453f479017b23",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "f76a8b323e28e0951f979dbef20a7496383c47df",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "df21857714398acb8b24a8bb5a6d2286dd9c59ef",
        "lessThan": "8e86817b8af4d552f3c6fe04ca52bb0c8c57411d",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "f8373d7090b745728de66308deeecc67e8d319ce",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sctp/input.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.25"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.25",
        "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/input.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53225

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40786 · Revision 1
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Publisher date
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