Answer in brief
CVE-2026-74579 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 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.
Answer in brief
CVE-2026-74579 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 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.