7.8

CVE-2026-64036

cgroup/rstat: validate cpu before css_rstat_cpu() access

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version a319185be9f5ad13c2a296d448ac52ffe45d194c
Version < 6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6
Status affected
Version a319185be9f5ad13c2a296d448ac52ffe45d194c
Version < fd2bd9fa7700ddf28296486b2598cff2f80cc819
Status affected
Version a319185be9f5ad13c2a296d448ac52ffe45d194c
Version < 8817005efbdfdf5d4e4814cb5dc52b53d12917d7
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 6.1
Status affected
Version 0
Version < 6.1
Status unaffected
Version <= 6.18.*
Version 6.18.34
Status unaffected
Version <= 7.0.*
Version 7.0.11
Status unaffected
Version <= *
Version 7.1
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.027
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6
https://git.kernel.org/stable/c/fd2bd9fa7700ddf28296486b2598cff2f80cc819
https://git.kernel.org/stable/c/8817005efbdfdf5d4e4814cb5dc52b53d12917d7