{"api_version":"1","generated_at":"2026-04-19T01:10:08+00:00","cve":"CVE-2026-31428","urls":{"html":"https://cve.report/CVE-2026-31428","api":"https://cve.report/api/cve/CVE-2026-31428.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31428","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31428"},"summary":{"title":"netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-13 14:16:12","updated_at":"2026-04-18 09:16:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a","name":"https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c","name":"https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aae","name":"https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62","name":"https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926","name":"https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482","name":"https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5","name":"https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7","name":"https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31428","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31428","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected df6fb868d6118686805c2fa566e213a8f31c8e4f 7f3e5d72455936f42709116fabeca3bb216cda62 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected df6fb868d6118686805c2fa566e213a8f31c8e4f 21d8efda029948d3666b0db5afcc0d36c0984aae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected df6fb868d6118686805c2fa566e213a8f31c8e4f fc961dd7272b5e4a462999635e44a4770d7f2482 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected df6fb868d6118686805c2fa566e213a8f31c8e4f a8365d1064ded323797c5e28e91070c52f44b76c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.131 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.80 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.21 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.11 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31428","cve":"CVE-2026-31428","epss":"0.000240000","percentile":"0.066100000","score_date":"2026-04-18","updated_at":"2026-04-19 00:10:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nfnetlink_log.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7f3e5d72455936f42709116fabeca3bb216cda62","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"},{"lessThan":"21d8efda029948d3666b0db5afcc0d36c0984aae","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"},{"lessThan":"fc961dd7272b5e4a462999635e44a4770d7f2482","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"},{"lessThan":"a8365d1064ded323797c5e28e91070c52f44b76c","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"},{"lessThan":"a2f6ff3444b663d6cfa63eadd61327a18592885a","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"},{"lessThan":"c9f6c51d36482805ac3ffadb9663fe775a13e926","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"},{"lessThan":"7eff72968161fb8ddb26113344de3b92fb7d7ef5","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"},{"lessThan":"52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7","status":"affected","version":"df6fb868d6118686805c2fa566e213a8f31c8e4f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nfnetlink_log.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.24"},{"lessThan":"2.6.24","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.131","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.131","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.80","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.21","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.11","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.24","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-04-18T08:59:45.785Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31428","datePublished":"2026-04-13T13:40:30.987Z","dateReserved":"2026-03-09T15:48:24.089Z","dateUpdated":"2026-04-18T08:59:45.785Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-13 14:16:12","lastModifiedDate":"2026-04-18 09:16:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31428","Ordinal":"1","Title":"netfilter: nfnetlink_log: fix uninitialized padding leak in NFUL","CVE":"CVE-2026-31428","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31428","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"netfilter: nfnetlink_log: fix uninitialized padding leak in NFUL"}]}}}