GHSA-PWG2-G943-8MR4
Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30In the Linux kernel, the following vulnerability has been resolved:
bpf: Validate BTF repeated field counts before expansion
btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD, and btf_repeat_fields() expands repeatable fields from array elements into the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields().
The remaining-capacity check performs the expanded field count calculation in u32. A malformed BTF can wrap that calculation, causing the check to pass even when the expanded field count exceeds the scratch array capacity. The following memcpy() can then write past the end of the array.
Use checked addition and multiplication before copying repeated fields and reject impossible counts.
{
"affected": [],
"aliases": [
"CVE-2026-64354"
],
"database_specific": {
"cwe_ids": [
"CWE-190"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-25T10:17:17Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Validate BTF repeated field counts before expansion\n\nbtf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD,\nand btf_repeat_fields() expands repeatable fields from array elements\ninto the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields().\n\nThe remaining-capacity check performs the expanded field count calculation\nin u32. A malformed BTF can wrap that calculation, causing the check to\npass even when the expanded field count exceeds the scratch array\ncapacity. The following memcpy() can then write past the end of the\narray.\n\nUse checked addition and multiplication before copying repeated fields\nand reject impossible counts.",
"id": "GHSA-pwg2-g943-8mr4",
"modified": "2026-07-27T06:30:33Z",
"published": "2026-07-25T12:31:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64354"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9452b594fd3aecbfd4aa0a6a1f741330a37dab7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c5ff816d5f13900c3f1f3298cfcc61339e056e56"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cd407de2ef5dc70f1970b343ffaa16186340fdfd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ff77d013b737c0f77d925e2f2c59f0cf3d76bd35"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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