GHSA-HC7J-44JC-Q764
Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-21 18:33In 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.
{
"affected": [],
"aliases": [
"CVE-2026-43453"
],
"database_specific": {
"cwe_ids": [
"CWE-125"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-08T15:16:58Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop()\n\npipapo_drop() passes rulemap[i + 1].n to pipapo_unmap() as the\nto_offset argument on every iteration, including the last one where\ni == m-\u003efield_count - 1. This reads one element past the end of the\nstack-allocated rulemap array (declared as rulemap[NFT_PIPAPO_MAX_FIELDS]\nwith NFT_PIPAPO_MAX_FIELDS == 16).\n\nAlthough pipapo_unmap() returns early when is_last is true without\nusing the to_offset value, the argument is evaluated at the call site\nbefore the function body executes, making this a genuine out-of-bounds\nstack read confirmed by KASAN:\n\n BUG: KASAN: stack-out-of-bounds in pipapo_drop+0x50c/0x57c [nf_tables]\n Read of size 4 at addr ffff8000810e71a4\n\n This frame has 1 object:\n [32, 160) \u0027rulemap\u0027\n\n The buggy address is at offset 164 -- exactly 4 bytes past the end\n of the rulemap array.\n\nPass 0 instead of rulemap[i + 1].n on the last iteration to avoid\nthe out-of-bounds read.",
"id": "GHSA-hc7j-44jc-q764",
"modified": "2026-05-21T18:33:06Z",
"published": "2026-05-08T15:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43453"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0a55d62cdb628923d8a21724374a70c76ac7d19d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1957e793196e7f8557374fd4eda53abcbb42e1c0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/324b749aa5b2d516ccfab933df9d3f56e7807f5f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/60c1d18781e37bfb96290b86510eb01c5fa24d75"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d6d8cd2db236a9dd13dbc2d05843b3445cc964b5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dfbdac719198778b581bc0dd055df2542edb8c62"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e047f6fbb975f685d6c9fcef95b3b7787a79b46d"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.