CVE-2026-64354bpf: Validate BTF repeated field counts before expansion
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In 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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 797d73ee232dd1833dec4824bc53a22032e97c1c before c5ff816d5f13900c3f1f3298cfcc61339e056e56; from 797d73ee232dd1833dec4824bc53a22032e97c1c before cd407de2ef5dc70f1970b343ffaa16186340fdfd; from 797d73ee232dd1833dec4824bc53a22032e97c1c before ff77d013b737c0f77d925e2f2c59f0cf3d76bd35; from 797d73ee232dd1833dec4824bc53a22032e97c1c before b9452b594fd3aecbfd4aa0a6a1f741330a37dab7; 6f957d972feee9b385ea3ae6530310a84e55ba71; from 6.11.6 before 6.12 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.11.6 before 6.12; from 6.12.1 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 6.12; 6.12; 6.12; 6.12; and 1 more ranges | NVD |
References
- https://git.kernel.org/stable/c/c5ff816d5f13900c3f1f3298cfcc61339e056e56patch
- https://git.kernel.org/stable/c/cd407de2ef5dc70f1970b343ffaa16186340fdfdpatch
- https://git.kernel.org/stable/c/ff77d013b737c0f77d925e2f2c59f0cf3d76bd35patch
- https://git.kernel.org/stable/c/b9452b594fd3aecbfd4aa0a6a1f741330a37dab7patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.