netfilter: nft_payload: fix mask build for partial field offload
Summary
| CVE | CVE-2026-74579 |
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| State | PUBLISHED |
|---|
| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-08-17 06:19:56 UTC |
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| Updated | 2026-08-17 06:19:56 UTC |
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| 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| 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 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
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de |
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/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/630295d5bba1d0e0f494cc459452eb0a0058c545 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.