{"api_version":"1","generated_at":"2026-08-17T11:24:44+00:00","cve":"CVE-2026-74579","urls":{"html":"https://cve.report/CVE-2026-74579","api":"https://cve.report/api/cve/CVE-2026-74579.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74579","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74579"},"summary":{"title":"netfilter: nft_payload: fix mask build for partial field offload","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field.  For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 << 120, which\nis undefined on the 32-bit int operand.  It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n  UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n  shift exponent 120 is too large for 32-bit type 'int'\n  ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-17 06:19:56","updated_at":"2026-08-17 06:19:56"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de","name":"https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d","name":"https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d","name":"https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396","name":"https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545","name":"https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74579","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74579","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 b19b5d2e042c294e2cc1c908dc598f9d64015396 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 a375d8ace807767f29f276b681b6324c74929b1d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 16b553c46e347bc9de9946c4960654d5884a86de git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 630295d5bba1d0e0f494cc459452eb0a0058c545 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 39e88f28fb32bf02bd4b525c24c842c9cff5663d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c2b4b4f9fa5b765b927e361e3d310bcb5773015 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.9.14 5.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.151 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nft_payload.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b19b5d2e042c294e2cc1c908dc598f9d64015396","status":"affected","version":"a5d45bc0dc50f9dd83703510e9804d813a9cac32","versionType":"git"},{"lessThan":"a375d8ace807767f29f276b681b6324c74929b1d","status":"affected","version":"a5d45bc0dc50f9dd83703510e9804d813a9cac32","versionType":"git"},{"lessThan":"16b553c46e347bc9de9946c4960654d5884a86de","status":"affected","version":"a5d45bc0dc50f9dd83703510e9804d813a9cac32","versionType":"git"},{"lessThan":"630295d5bba1d0e0f494cc459452eb0a0058c545","status":"affected","version":"a5d45bc0dc50f9dd83703510e9804d813a9cac32","versionType":"git"},{"lessThan":"39e88f28fb32bf02bd4b525c24c842c9cff5663d","status":"affected","version":"a5d45bc0dc50f9dd83703510e9804d813a9cac32","versionType":"git"},{"status":"affected","version":"5c2b4b4f9fa5b765b927e361e3d310bcb5773015","versionType":"git"},{"lessThan":"5.10","status":"affected","version":"5.9.14","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nft_payload.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.10"},{"lessThan":"5.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.151","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field.  For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 << 120, which\nis undefined on the 32-bit int operand.  It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n  UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n  shift exponent 120 is too large for 32-bit type 'int'\n  ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes."}],"providerMetadata":{"dateUpdated":"2026-08-17T05:28:27.768Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396"},{"url":"https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d"},{"url":"https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de"},{"url":"https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545"},{"url":"https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d"}],"title":"netfilter: nft_payload: fix mask build for partial field offload","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74579","datePublished":"2026-08-17T05:28:27.768Z","dateReserved":"2026-08-15T05:44:03.917Z","dateUpdated":"2026-08-17T05:28:27.768Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-17 06:19:56","lastModifiedDate":"2026-08-17 06:19:56","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74579","Ordinal":"1","Title":"netfilter: nft_payload: fix mask build for partial field offload","CVE":"CVE-2026-74579","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74579","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field.  For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 << 120, which\nis undefined on the 32-bit int operand.  It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n  UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n  shift exponent 120 is too large for 32-bit type 'int'\n  ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes.","Type":"Description","Title":"netfilter: nft_payload: fix mask build for partial field offload"}]}}}