{"id":"CVE-2026-74579","revision":"18de8243b27345668a264a243b1cf356","records":[{"revision":"18de8243b27345668a264a243b1cf356","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74579","aliases":[],"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":0,"publishedAt":"2026-08-17T05:28:27.768+00:00","modifiedAt":"2026-10-16T19:05:57.728+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/nft_payload.c\"\n ],\n \"versions\": [\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"8720df4504e0ed1781a702f65251bd47b3534d5e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"363c3a84a946d53e5e121c9f47c7c2b7d228c46b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"b19b5d2e042c294e2cc1c908dc598f9d64015396\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"a375d8ace807767f29f276b681b6324c74929b1d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"16b553c46e347bc9de9946c4960654d5884a86de\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"630295d5bba1d0e0f494cc459452eb0a0058c545\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5d45bc0dc50f9dd83703510e9804d813a9cac32\",\n \"lessThan\": \"39e88f28fb32bf02bd4b525c24c842c9cff5663d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5c2b4b4f9fa5b765b927e361e3d310bcb5773015\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.9.14\",\n \"lessThan\": \"5.10\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/nft_payload.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.151\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.103\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.44\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.8\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7","https://git.kernel.org/stable/c/8720df4504e0ed1781a702f65251bd47b3534d5e","https://git.kernel.org/stable/c/363c3a84a946d53e5e121c9f47c7c2b7d228c46b","https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396","https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d","https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de","https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545","https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74579","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74579","identifiers":["CVE-2026-74579"]},"retained":false,"historicalAffected":[]}],"coverage":[]}