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CVE-2026-74579

netfilter: nft_payload: fix mask build for partial field offload

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10, 5.10.265, 5.15.216, 6.1.183, 6.6.151, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in 3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7; From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in 8720df4504e0ed1781a702f65251bd47b3534d5e; From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in 363c3a84a946d53e5e121c9f47c7c2b7d228c46b; From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in b19b5d2e042c294e2cc1c908dc598f9d64015396; From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in a375d8ace807767f29f276b681b6324c74929b1d; From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in 16b553c46e347bc9de9946c4960654d5884a86de; From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in 630295d5bba1d0e0f494cc459452eb0a0058c545; From a5d45bc0dc50f9dd83703510e9804d813a9cac32 · fixed in 39e88f28fb32bf02bd4b525c24c842c9cff5663d; From 5.9.14 · fixed in 5.10

  • Linux Linux

    5.10

  • KernelLinux

    From 5.10.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.151; From 6.7.0 · fixed in 6.12.103; From 6.13.0 · fixed in 6.18.44; From 6.19.0 · fixed in 7.1.8

References 8

git.kernel.org