netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator

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Summary

CVECVE-2026-43085
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:21 UTC
Updated2026-05-06 13:08:07 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 368c22aea490f6f50df831b4f9e3623787686c5b git Not specified
CNA Linux Linux affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 d1399632ba255d2e02c757af5d9f5d9279ce168c git Not specified
CNA Linux Linux affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 d552bcfca323d175664d7444989b04f55666978a git Not specified
CNA Linux Linux affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 15d209bccf9273b4a8b4e579ba0e92d065b6ec8c git Not specified
CNA Linux Linux affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 1f3083aec8836213da441270cdb1ab612dd82cf4 git Not specified
CNA Linux Linux affected 2.6.23 Not specified
CNA Linux Linux unaffected 2.6.23 semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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