CVE-2026-74579
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, a vulnerability in netfilter: nft_payload was fixed regarding mask build for partial field offload. For a partial IPv6 address match (field_len = 16, priv_len = 1), the shift 1 << 120 is undefined on 32-bit int. It also over-masks trailing bytes, potentially causing packet matching errors. The fix sets bytes directly and removes the unsafe shift.
Risk Assessment
The vulnerability could lead to incorrect packet filtering rules, potentially allowing an attacker to bypass network security or cause system crashes.
Recommendation
Apply the Linux kernel patch that removes the undefined shift and fixes mask building. Update your system to a kernel version containing this fix.
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Original NVD description (English source)
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.