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netfilter: conntrack: add missing netlink policy validations

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly. Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.

Announced Source revision 1
Original source ↗

CVE-2026-31407

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-2026-31407

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": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "e7b5766693477c52424cc6c79dd30a7a9c7db52c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "78bba9f73942aa7dca47d817d8cec0fb9b443b70",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "be88a337bf07afb1ee173f1099294d1b7ab3fefe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "c5e918390002edf0cff80a0e7ce1f86f16a9507c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "9174d28f3f15d8c4962f5980c0be167633880443",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "67c53c1978cef3c504237275e39c857e2f6af56e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "0fbae1e74493d5a160a70c51aeba035d8266ea7d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
        "lessThan": "f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_netlink.c",
      "net/netfilter/nf_conntrack_proto_sctp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.27"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.27",
        "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": "6.6.136",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.83",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_netlink.c",
      "net/netfilter/nf_conntrack_proto_sctp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31407

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39869 · Revision 1
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Publisher date
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