{"apiVersion":"1.0","identifier":"CVE-2026-74579","description":"In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_payload: fix mask build for partial field offload nft_payload_offload_mask() builds the offload match mask for a payload expression that covers only part of a header field. For a partial IPv6 address match (field_len = 16, priv_len = 1) that shift is 1 << 120, which is undefined on the 32-bit int operand. It also trims only one word, so the remaining words stay 0xffffffff (and when priv_len is a multiple of 4 the trim is skipped entirely), leaving the mask covering more bytes than the rule matches. UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20 shift exponent 120 is too large for 32-bit type -int- ... The match is byte-granular and struct nft_data is zero-initialised, so the correct mask is simply the first priv_len bytes set to 0xff. Set those bytes directly and drop the word/shift trimming; this removes the undefined shift and no longer over-masks the trailing bytes.","publishedAt":"2026-08-17T06:19:56","lastModifiedAt":"2026-08-25T06:18:30","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74579","cvssScore":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","epssProbability":0.0012,"riskScore":0.72,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74579","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74579","en":"https://www.redsauce.net/en/cves/CVE-2026-74579","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74579","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74579","de":"https://www.redsauce.net/de/cves/CVE-2026-74579","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74579","el":"https://www.redsauce.net/el/cves/CVE-2026-74579"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74579"}}