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netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body. Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers.

Announced Group revision 1
Original source ↗

CVE-2026-43085

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-2026-43085

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": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "296f18e1c3a87c915a92ed27832d5040a22d1072",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "9e2182865de781c41ab16b7985e9d26dcefea867",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "57cc509d82b46150a11dcecc8b25eaa177eda34d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "368c22aea490f6f50df831b4f9e3623787686c5b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "d1399632ba255d2e02c757af5d9f5d9279ce168c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "d552bcfca323d175664d7444989b04f55666978a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "15d209bccf9273b4a8b4e579ba0e92d065b6ec8c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
        "lessThan": "1f3083aec8836213da441270cdb1ab612dd82cf4",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_log.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.23"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.23",
        "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": "6.19.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_log.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43085

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28345 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-43085 · Revision 1Source updated