CVE-2026-64036

CVE CVE-2026-64036EUVD EUVD-2026-45609Published 2026-07-19T15:39:24.000ZLast changed 2026-08-05T12:38:30.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; patch: 7.1; patch: 7.0.11; a319185be9f5ad13c2a296d448ac52ffe45d194c <6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6; 6.1; a319185be9f5ad13c2a296d448ac52ffe45d194c <8817005efbdfdf5d4e4814cb5dc52b53d12917d7; patch: 6.18.34; a319185be9f5ad13c2a296d448ac52ffe45d194c <fd2bd9fa7700ddf28296486b2598cff2f80cc819

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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