bpf: Validate BTF repeated field counts before expansion
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.12, 6.12.96, 6.18.39, 7.1.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 797d73ee232dd1833dec4824bc53a22032e97c1c · fixed in c5ff816d5f13900c3f1f3298cfcc61339e056e56; From 797d73ee232dd1833dec4824bc53a22032e97c1c · fixed in cd407de2ef5dc70f1970b343ffaa16186340fdfd; From 797d73ee232dd1833dec4824bc53a22032e97c1c · fixed in ff77d013b737c0f77d925e2f2c59f0cf3d76bd35; From 797d73ee232dd1833dec4824bc53a22032e97c1c · fixed in b9452b594fd3aecbfd4aa0a6a1f741330a37dab7; From 6.11.6 · fixed in 6.12
- Linux Linux
6.12
- KernelLinux
From 6.12.0 · fixed in 6.12.96; From 6.13.0 · fixed in 6.18.39; From 6.19.0 · fixed in 7.1.4