netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop()
Summary
| CVE | CVE-2026-43453 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-08 15:16:58 UTC |
| Updated | 2026-05-12 14:10:27 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop() pipapo_drop() passes rulemap[i + 1].n to pipapo_unmap() as the to_offset argument on every iteration, including the last one where i == m->field_count - 1. This reads one element past the end of the stack-allocated rulemap array (declared as rulemap[NFT_PIPAPO_MAX_FIELDS] with NFT_PIPAPO_MAX_FIELDS == 16). Although pipapo_unmap() returns early when is_last is true without using the to_offset value, the argument is evaluated at the call site before the function body executes, making this a genuine out-of-bounds stack read confirmed by KASAN: BUG: KASAN: stack-out-of-bounds in pipapo_drop+0x50c/0x57c [nf_tables] Read of size 4 at addr ffff8000810e71a4 This frame has 1 object: [32, 160) 'rulemap' The buggy address is at offset 164 -- exactly 4 bytes past the end of the rulemap array. Pass 0 instead of rulemap[i + 1].n on the last iteration to avoid the out-of-bounds read. |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.070360000 (date 2026-05-12)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da 1957e793196e7f8557374fd4eda53abcbb42e1c0 git | Not specified |
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e git | Not specified |
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da 60c1d18781e37bfb96290b86510eb01c5fa24d75 git | Not specified |
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da 0a55d62cdb628923d8a21724374a70c76ac7d19d git | Not specified |
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da dfbdac719198778b581bc0dd055df2542edb8c62 git | Not specified |
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da e047f6fbb975f685d6c9fcef95b3b7787a79b46d git | Not specified |
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da 324b749aa5b2d516ccfab933df9d3f56e7807f5f git | Not specified |
| CNA | Linux | Linux | affected 3c4287f62044a90e73a561aa05fc46e62da173da d6d8cd2db236a9dd13dbc2d05843b3445cc964b5 git | Not specified |
| CNA | Linux | Linux | affected 5.6 | Not specified |
| CNA | Linux | Linux | unaffected 5.6 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.253 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.167 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.19 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.9 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/dfbdac719198778b581bc0dd055df2542edb8c62 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/324b749aa5b2d516ccfab933df9d3f56e7807f5f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1957e793196e7f8557374fd4eda53abcbb42e1c0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/60c1d18781e37bfb96290b86510eb01c5fa24d75 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e047f6fbb975f685d6c9fcef95b3b7787a79b46d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0a55d62cdb628923d8a21724374a70c76ac7d19d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d6d8cd2db236a9dd13dbc2d05843b3445cc964b5 | 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.