CVE-2026-64036cgroup/rstat: validate cpu before css_rstat_cpu() access
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- 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 a319185be9f5ad13c2a296d448ac52ffe45d194c before 6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6; from a319185be9f5ad13c2a296d448ac52ffe45d194c before fd2bd9fa7700ddf28296486b2598cff2f80cc819; from a319185be9f5ad13c2a296d448ac52ffe45d194c before 8817005efbdfdf5d4e4814cb5dc52b53d12917d7 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.1 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6patch
- https://git.kernel.org/stable/c/fd2bd9fa7700ddf28296486b2598cff2f80cc819patch
- https://git.kernel.org/stable/c/8817005efbdfdf5d4e4814cb5dc52b53d12917d7patch
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.