netfilter: nft_payload: fix mask build for partial field offload

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74579
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-17 06:19:56 UTC
Updated2026-08-25 06:18:30 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

EPSS: 0.001200000 probability, percentile 0.020310000 (date 2026-08-25)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7 git Not specified
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 8720df4504e0ed1781a702f65251bd47b3534d5e git Not specified
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 363c3a84a946d53e5e121c9f47c7c2b7d228c46b git Not specified
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 b19b5d2e042c294e2cc1c908dc598f9d64015396 git Not specified
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 a375d8ace807767f29f276b681b6324c74929b1d git Not specified
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 16b553c46e347bc9de9946c4960654d5884a86de git Not specified
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 630295d5bba1d0e0f494cc459452eb0a0058c545 git Not specified
CNA Linux Linux affected a5d45bc0dc50f9dd83703510e9804d813a9cac32 39e88f28fb32bf02bd4b525c24c842c9cff5663d git Not specified
CNA Linux Linux affected 5c2b4b4f9fa5b765b927e361e3d310bcb5773015 git Not specified
CNA Linux Linux affected 5.9.14 5.10 semver Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8720df4504e0ed1781a702f65251bd47b3534d5e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/363c3a84a946d53e5e121c9f47c7c2b7d228c46b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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