bpf: Validate BTF repeated field counts before expansion
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.
CVE-2026-64354
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64354
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "797d73ee232dd1833dec4824bc53a22032e97c1c",
"lessThan": "c5ff816d5f13900c3f1f3298cfcc61339e056e56",
"versionType": "git"
},
{
"status": "affected",
"version": "797d73ee232dd1833dec4824bc53a22032e97c1c",
"lessThan": "cd407de2ef5dc70f1970b343ffaa16186340fdfd",
"versionType": "git"
},
{
"status": "affected",
"version": "797d73ee232dd1833dec4824bc53a22032e97c1c",
"lessThan": "ff77d013b737c0f77d925e2f2c59f0cf3d76bd35",
"versionType": "git"
},
{
"status": "affected",
"version": "797d73ee232dd1833dec4824bc53a22032e97c1c",
"lessThan": "b9452b594fd3aecbfd4aa0a6a1f741330a37dab7",
"versionType": "git"
},
{
"status": "affected",
"version": "6f957d972feee9b385ea3ae6530310a84e55ba71",
"versionType": "git"
},
{
"status": "affected",
"version": "6.11.6",
"lessThan": "6.12",
"versionType": "semver"
}
],
"programFiles": [
"kernel/bpf/btf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/btf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64354
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41012 · Revision 1
- Added to Heist Feed
- Publisher date