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sctp: auth: verify auth requirement when auth_chunk is NULL

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: auth: verify auth requirement when auth_chunk is NULL sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when: 1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this. 2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL. Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.

Announced Source revision 1
Original source ↗

CVE-2026-68300

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-2026-68300

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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "a129792b3aef15002746c13522781d92ed3522c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "5a022ac51ad83b4ce6c898f4b9eefc65bd26b247",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "6caf0e8590c0bf05a76b0d387726adf3a6f3725c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "ec2e157fc9678a9bc411305a25aec3fd337d7efb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "28c5fdce9dd955d2baf5e28987819b6d7cfaf646",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "18957373920caf5cdaf5cf32e5d1d7a99ca7700a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "83f5031f2a6a49d696eb4cc0898345d12f9c6451",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
        "lessThan": "8e04823c120b376ef7dab14b60ebf6823aa16c14",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sctp/sm_statefuns.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.24"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.24",
        "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": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sctp/sm_statefuns.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68300

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#41692 · Revision 1
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Publisher date
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