Answer in brief
CVE-2026-74579 records a High severity (CVSS 7.1) vulnerability in netfilter: nft_payload: fix mask build for partial field offload. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <b19b5d2e042c294e2cc1c908dc598f9d64015396 || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <a375d8ace807767f29f276b681b6324c74929b1d || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <16b553c46e347bc9de9946c4960654d5884a86de || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <630295d5bba1d0e0f494cc459452eb0a0058c545 || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <39e88f28fb32bf02bd4b525c24c842c9cff5663d || 5c2b4b4f9fa5b765b927e361e3d310bcb5773015 || >=5.9.14 <5.10 | b19b5d2e042c294e2cc1c908dc598f9d64015396, a375d8ace807767f29f276b681b6324c74929b1d, 16b553c46e347bc9de9946c4960654d5884a86de, 630295d5bba1d0e0f494cc459452eb0a0058c545, 39e88f28fb32bf02bd4b525c24c842c9cff5663d, 5.10 |
| Linux/Linuxgeneric | 5.10 | Not reported |
| Linux/Linuxgeneric | >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7 || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <8720df4504e0ed1781a702f65251bd47b3534d5e || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <363c3a84a946d53e5e121c9f47c7c2b7d228c46b || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <b19b5d2e042c294e2cc1c908dc598f9d64015396 || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <a375d8ace807767f29f276b681b6324c74929b1d || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <16b553c46e347bc9de9946c4960654d5884a86de || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <630295d5bba1d0e0f494cc459452eb0a0058c545 || >=a5d45bc0dc50f9dd83703510e9804d813a9cac32 <39e88f28fb32bf02bd4b525c24c842c9cff5663d || 5c2b4b4f9fa5b765b927e361e3d310bcb5773015 || >=5.9.14 <5.10 | 3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7, 8720df4504e0ed1781a702f65251bd47b3534d5e, 363c3a84a946d53e5e121c9f47c7c2b7d228c46b, b19b5d2e042c294e2cc1c908dc598f9d64015396, a375d8ace807767f29f276b681b6324c74929b1d, 16b553c46e347bc9de9946c4960654d5884a86de, 630295d5bba1d0e0f494cc459452eb0a0058c545, 39e88f28fb32bf02bd4b525c24c842c9cff5663d, 5.10 |
Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.