CVE-2026-64036
- Source
- https://cve.org/CVERecord?id=CVE-2026-64036
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64036.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-64036
- Downstream
- Published
- 2026-07-19T15:39:24.783Z
- Modified
- 2026-07-22T05:29:43.196170132Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- cgroup/rstat: validate cpu before css_rstat_cpu() access
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
cgroup/rstat: validate cpu before cssrstatcpu() access
cssrstatupdated() 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 CAPBPF and CAPPERFMON 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: cssrstatupdated bpfiterrunprog cgroupiterseqshow bpfseqread
Add cpu validation to the BPF-facing cssrstatupdated() kfunc and move the common implementation to __cssrstatupdated() for in-kernel callers.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64036.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6
- https://git.kernel.org/stable/c/8817005efbdfdf5d4e4814cb5dc52b53d12917d7
- https://git.kernel.org/stable/c/fd2bd9fa7700ddf28296486b2598cff2f80cc819
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64036.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-64036
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git