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net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring When an sk_msg scatterlist ring wraps (sg.end < sg.start), tls_push_record() chains the tail portion of the ring to the head using sg_chain(). An extra entry in the sg array is reserved for this: struct sk_msg_sg { [...] /* The extra two elements: * 1) used for chaining the front and sections when the list becomes * partitioned (e.g. end < start). The crypto APIs require the * chaining; * 2) to chain tailer SG entries after the message. */ struct scatterlist data[MAX_MSG_FRAGS + 2]; The current code uses MAX_SKB_FRAGS + 1 as the ring size: sg_chain(&msg_pl->sg.data[msg_pl->sg.start], MAX_SKB_FRAGS - msg_pl->sg.start + 1, msg_pl->sg.data); This places the chain pointer at sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. = &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 = data[start + (MAX_SKB_FRAGS - start + 1) - 1] = data[MAX_SKB_FRAGS] instead of the true last entry. This is likely due to a "race" of the commit under Fixes landing close to commit 031097d9e079 ("bpf: sk_msg, zap ingress queue on psock down") Convert to ARRAY_SIZE and drop the data[start] / - start (as suggested by Sabrina).

Announced Source revision 1
Original source ↗

CVE-2026-64047

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-2026-64047

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": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "73963a375885d5ccb7def39fd0b4f542e0f343dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "47110c3a9ac247b688657337f5981efcfcb240dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "84158c2997159df4a0d70cd9c46774512d32a522",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "131ef12057d92b77b636321b7849c69222405a97",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "66339b71f105e6f83e0da3b9583d95077534fe1d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "eca989eab4b2599dcb02f72140a7c08f08838520",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "2fb0dc7e0099686c4e9d2732745d8a31b18c3628",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
        "lessThan": "285943c6e7ca309bbea84b253745154241d9788a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d529d6c9f7e3aaeac13c4948f79799ccb825f29d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.4.14",
        "lessThan": "5.5",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/tls/tls_sw.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.142",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.92",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.34",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.11",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/tls/tls_sw.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64047

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40947 · Revision 1
Added to Heist Feed
Publisher date
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