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In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_payload: fix mask build for partial field offload… (CVE-2026-74579)

0
High
Published: 08/17/2026 (08/17/2026, 06:33:56 UTC)
Source: GCVE Database

Description

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.

CVSS v3.1

Score 7.1high

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

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-h46j-5f2w-jjq4
Osv Schema Version
1.4.0
Aliases
["CVE-2026-74579"]
Ecosystems
[]
Database Specific Severity
HIGH
Cvss Version
3.1

Threat ID: 6a8d9aecacd9273b493e1843

Added to database: 08/25/2026, 13:38:52 UTC

Last updated: 08/25/2026, 15:52:07 UTC

Views: 5

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