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netfilter: nf_conntrack: defer invalid log until after unlock

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: defer invalid log until after unlock TCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock is still held. When invalid logging is routed to nfnetlink_log and conntrack export is enabled, the log path can re-enter conntrack netlink glue and dump the same conntrack again. Protocol attribute dumping may take ct->lock, so logging while holding that lock can deadlock. Defer the TCP invalid logs by storing only the minimal log context while ct->lock is held and emitting the log after unlocking. Also make the TCP timeout-lowering invalid path return whether a log is needed, then emit that log after unlocking. Do the same for the SCTP invalid state-transition log that can be reached while ct->lock is held. Add a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers that log invalid conntracks while holding ct->lock are caught outside TCP and SCTP as well.

Announced Source revision 1
Original source ↗

CVE-2026-74624

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-2026-74624

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": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
        "lessThan": "ca97360eba4b3dc67f1804625542f4ccc774242a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
        "lessThan": "63853eb20bba4e00b7cd0b8cfc19337bbaaf5037",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
        "lessThan": "9480fcf70a5aa9d320088a01c95df0e5e6391f4a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
        "lessThan": "0424186d570aa4d1ad17f516afb86bd9eaa4f42e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
        "lessThan": "c0224327b7cbed9d3198e8dbec847281053dcd06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
        "lessThan": "2d19b95c9723001f214f7a47d67b09f46238f200",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_proto.c",
      "net/netfilter/nf_conntrack_proto_sctp.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": "6.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_proto.c",
      "net/netfilter/nf_conntrack_proto_sctp.c",
      "net/netfilter/nf_conntrack_proto_tcp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74624

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34246 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement