Skip to content
Heist/ feed
Unrated

netfilter: ctnetlink: use netlink policy range checks

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: use netlink policy range checks Replace manual range and mask validations with netlink policy annotations in ctnetlink code paths, so that the netlink core rejects invalid values early and can generate extack errors. - CTA_PROTOINFO_TCP_STATE: reject values > TCP_CONNTRACK_SYN_SENT2 at policy level, removing the manual >= TCP_CONNTRACK_MAX check. - CTA_PROTOINFO_TCP_WSCALE_ORIGINAL/REPLY: reject values > TCP_MAX_WSCALE (14). The normal TCP option parsing path already clamps to this value, but the ctnetlink path accepted 0-255, causing undefined behavior when used as a u32 shift count. - CTA_FILTER_ORIG_FLAGS/REPLY_FLAGS: use NLA_POLICY_MASK with CTA_FILTER_F_ALL, removing the manual mask checks. - CTA_EXPECT_FLAGS: use NLA_POLICY_MASK with NF_CT_EXPECT_MASK, adding a new mask define grouping all valid expect flags. Extracted from a broader nf-next patch by Florian Westphal, scoped to ctnetlink for the fixes tree.

Announced Source revision 1
Original source ↗

CVE-2026-31495

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-2026-31495

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": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "435b576cd2faa75154777868f8cbb73bf71644d3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "2ef71307c86a9f866d6e28f1a0c06e2e9d794474",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "4f7d25f3f0786402ba48ff7d13b6241d77d975f5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "fcec5ce2d73a41668b24e3f18c803541602a59f6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "675c913b940488a84effdeeac5a1cfb657b59804",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "c6cb41eaae875501eaaa487b8db6539feb092292",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "45c33e79ae705b7af97e3117672b6cd258dd0b1b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c8e2078cfe414a99cf6f2f2f1d78c7e75392e9d4",
        "lessThan": "8f15b5071b4548b0aafc03b366eb45c9c6566704",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/uapi/linux/netfilter/nf_conntrack_common.h",
      "net/netfilter/nf_conntrack_netlink.c",
      "net/netfilter/nf_conntrack_proto_tcp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.22"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.22",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.131",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.21",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.11",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/uapi/linux/netfilter/nf_conntrack_common.h",
      "net/netfilter/nf_conntrack_netlink.c",
      "net/netfilter/nf_conntrack_proto_tcp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31495

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28284 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement