cgroup/rstat: validate cpu before css_rstat_cpu() access
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.6.160, 6.12.114, 6.18.34, 7.0.11
- 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: cgroup/rstat: validate cpu before css_rstat_cpu() access css_rstat_updated() is exposed as a BPF kfunc and accepts a caller-provided cpu argument. The function uses cpu for per-cpu rstat lookups without checking whether it refers to a valid possible CPU. A BPF iter/cgroup program with CAP_BPF and CAP_PERFMON can pass an invalid cpu value. On an unfixed UBSCAN_BOUNDS test kernel, cpu == 0x7fffffff triggers: UBSAN: array-index-out-of-bounds in kernel/cgroup/rstat.c:31:9 index 2147483647 is out of range for type 'long unsigned int [64]' Call Trace: css_rstat_updated bpf_iter_run_prog cgroup_iter_seq_show bpf_seq_read Add cpu validation to the BPF-facing css_rstat_updated() kfunc and move the common implementation to __css_rstat_updated() for in-kernel callers.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From a319185be9f5ad13c2a296d448ac52ffe45d194c · fixed in b28b862b07257219755d0b0a7fbe5d23b7c9ea91; From a319185be9f5ad13c2a296d448ac52ffe45d194c · fixed in 3d595affbe00a2e8bf43b9f2947a8efcdc1c059e; From a319185be9f5ad13c2a296d448ac52ffe45d194c · fixed in 6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6; From a319185be9f5ad13c2a296d448ac52ffe45d194c · fixed in fd2bd9fa7700ddf28296486b2598cff2f80cc819; From a319185be9f5ad13c2a296d448ac52ffe45d194c · fixed in 8817005efbdfdf5d4e4814cb5dc52b53d12917d7
- Linux Linux
6.1
- KernelLinux
From 6.1.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.114; From 6.13.0 · fixed in 6.18.34; From 6.19.0 · fixed in 7.0.11