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CVE-2026-64036

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-ind
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9d788a8a706a475a63dc657523dc8d001a132467a3f88eab6282f1f6722b6a96
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","product":"Linux","programFiles":["block/blk-cgroup.c","include/linux/cgroup.h","kernel/cgroup/rstat.c","mm/memcontrol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6","status":"affected","version":"a319185be9f5ad13c2a296d448ac52ffe45d194c","versionType":"git"},{"lessThan":"fd2bd9fa7700ddf28296486b2598cff2f80cc819","status":"affected","version":"a319185be9f5ad13c2a296d448ac52ffe45d194c","versionType":"git"},{"lessThan":"8817005efbdfdf5d4e4814cb5dc52b53d…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["block/blk-cgroup.c","include/linux/cgroup.h","kernel/cgroup/rstat.c","mm/memcontrol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.1"},{"lessThan":"6.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","product":"Linux","programFiles":["block/blk-cgroup.c","include/linux/cgroup.h","kernel/cgroup/rstat.c","mm/memcontrol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6","status":"affected","version":"a319185be9f5ad13c2a296d448ac52ffe45d194c","versionType":"git"},{"lessThan":"fd2bd9fa7700ddf28296486b2598cff2f80cc819","status":"affected","version":"a319185be9f5ad13c2a296d448ac52ffe45d194c","versionType":"git"},{"lessThan":"8817005efbdfdf5d4e4814cb5dc52b53d…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Linux","programFiles":["block/blk-cgroup.c","include/linux/cgroup.h","kernel/cgroup/rstat.c","mm/memcontrol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.1"},{"lessThan":"6.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/metrics/0/cvssV3_1

Source references

3 source assertions
{"url":"https://git.kernel.org/stable/c/6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/8817005efbdfdf5d4e4814cb5dc52b53d12917d7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/fd2bd9fa7700ddf28296486b2598cff2f80cc819"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0e8a6627a28e92e267f5f3d5027cdbb9e8a21e1f3747790f3fc07c63c10eacd2 · sha256:016be7c21ce5c722… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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