{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31428","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.089Z","datePublished":"2026-04-13T13:40:30.987Z","dateUpdated":"2026-05-11T22:08:31.017Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:08:31.017Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD\n\n__build_packet_message() manually constructs the NFULA_PAYLOAD netlink\nattribute using skb_put() and skb_copy_bits(), bypassing the standard\nnla_reserve()/nla_put() helpers. While nla_total_size(data_len) bytes\nare allocated (including NLA alignment padding), only data_len bytes\nof actual packet data are copied. The trailing nla_padlen(data_len)\nbytes (1-3 when data_len is not 4-byte aligned) are never initialized,\nleaking stale heap contents to userspace via the NFLOG netlink socket.\n\nReplace the manual attribute construction with nla_reserve(), which\nhandles the tailroom check, header setup, and padding zeroing via\n__nla_reserve(). The subsequent skb_copy_bits() fills in the payload\ndata on top of the properly initialized attribute."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nfnetlink_log.c"],"versions":[{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"7f3e5d72455936f42709116fabeca3bb216cda62","status":"affected","versionType":"git"},{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"21d8efda029948d3666b0db5afcc0d36c0984aae","status":"affected","versionType":"git"},{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"fc961dd7272b5e4a462999635e44a4770d7f2482","status":"affected","versionType":"git"},{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"a8365d1064ded323797c5e28e91070c52f44b76c","status":"affected","versionType":"git"},{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"a2f6ff3444b663d6cfa63eadd61327a18592885a","status":"affected","versionType":"git"},{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"c9f6c51d36482805ac3ffadb9663fe775a13e926","status":"affected","versionType":"git"},{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"7eff72968161fb8ddb26113344de3b92fb7d7ef5","status":"affected","versionType":"git"},{"version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","lessThan":"52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nfnetlink_log.c"],"versions":[{"version":"2.6.24","status":"affected"},{"version":"0","lessThan":"2.6.24","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.131","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.80","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.21","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.11","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62"},{"url":"https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aae"},{"url":"https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482"},{"url":"https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c"},{"url":"https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a"},{"url":"https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926"},{"url":"https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5"},{"url":"https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7"}],"title":"netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD","x_generator":{"engine":"bippy-1.2.0"}}}}