CVE-2026-43085 (GCVE-0-2026-43085)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17
VLAI?
Title
netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < 368c22aea490f6f50df831b4f9e3623787686c5b (git)
Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < d1399632ba255d2e02c757af5d9f5d9279ce168c (git)
Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < d552bcfca323d175664d7444989b04f55666978a (git)
Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < 15d209bccf9273b4a8b4e579ba0e92d065b6ec8c (git)
Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < 1f3083aec8836213da441270cdb1ab612dd82cf4 (git)
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Linux Linux Affected: 2.6.23
Unaffected: 0 , < 2.6.23 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "net/netfilter/nfnetlink_log.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator\n\nWhen batching multiple NFLOG messages (inst-\u003eqlen \u003e 1), __nfulnl_send()\nappends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via\nnlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()\nhelper only zeroes alignment padding after the payload, not the payload\nitself, so four bytes of stale kernel heap data are leaked to userspace\nin the NLMSG_DONE message body.\n\nUse nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes\nthe nfgenmsg payload via nfnl_fill_hdr(), consistent with how\n__build_packet_message() already constructs NFULNL_MSG_PACKET headers."
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        "dateUpdated": "2026-05-11T22:17:26.120Z",
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4"
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      ],
      "title": "netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator",
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    "cveId": "CVE-2026-43085",
    "datePublished": "2026-05-06T07:40:19.915Z",
    "dateReserved": "2026-05-01T14:12:55.983Z",
    "dateUpdated": "2026-05-11T22:17:26.120Z",
    "state": "PUBLISHED"
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  }
}


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