PT-2026-61353 · Linux · Linux

CVE-2026-64036 · Publicado 2026-07-19 · Atualizado 2026-07-19

NVD

CVSS v3.1

7.8

Alta

Vetor base

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Correção

Identificadores relacionados

CVE-2026-64036

Produtos afetados

Linux

Referências · 4

• https://git.kernel.org/stable/c/8817005efbdfdf5d4e4814cb5dc52b53d12917d7 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-64036 · Nota de Segurança
• https://git.kernel.org/stable/c/fd2bd9fa7700ddf28296486b2598cff2f80cc819 · Nota
• https://git.kernel.org/stable/c/6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6 · Nota