bpf: fix potential 32-bit overflow when accessing ARRAY map element
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 5.18.18, 5.19.2
- 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: fix potential 32-bit overflow when accessing ARRAY map element If BPF array map is bigger than 4GB, element pointer calculation can overflow because both index and elem_size are u32. Fix this everywhere by forcing 64-bit multiplication. Extract this formula into separate small helper and use it consistently in various places. Speculative-preventing formula utilizing index_mask trick is left as is, but explicit u64 casts are added in both places.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From c85d69135a9175c50a823d04d62d932312d037b3 · fixed in 063e092534d4c6785228e5b1eb6e9329f66ccbe4; From c85d69135a9175c50a823d04d62d932312d037b3 · fixed in 3c7256b880b3a5aa1895fd169a34aa4224a11862; From c85d69135a9175c50a823d04d62d932312d037b3 · fixed in 87ac0d600943994444e24382a87aa19acc4cd3d4
- Linux Linux
5.3
- KernelLinux
From 5.3.0 · fixed in 5.18.18; From 5.19.0 · fixed in 5.19.2