CVE-2026-74579 (GCVE-0-2026-74579)

Vulnerability from cvelistv5 – Published: 2026-08-17 05:28 – Updated: 2026-08-17 05:28
VLAI
Title
netfilter: nft_payload: fix mask build for partial field offload
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < b19b5d2e042c294e2cc1c908dc598f9d64015396 (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < a375d8ace807767f29f276b681b6324c74929b1d (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 16b553c46e347bc9de9946c4960654d5884a86de (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 630295d5bba1d0e0f494cc459452eb0a0058c545 (git)
Affected: a5d45bc0dc50f9dd83703510e9804d813a9cac32 , < 39e88f28fb32bf02bd4b525c24c842c9cff5663d (git)
Affected: 5c2b4b4f9fa5b765b927e361e3d310bcb5773015 (git)
Affected: 5.9.14 , < 5.10 (semver)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-08-15T05:44:03.917Z",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.