CVE-2026-64036

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 19, 2026

Last Modified

July 20, 2026

Advisory Details (3)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

cgroup/rstat: validate cpu before css_rstat_cpu() access - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fd2bd9fa7700ddf28296486b2598cff2f80cc819
generic

cgroup/rstat: validate cpu before css_rstat_cpu() access - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8817005efbdfdf5d4e4814cb5dc52b53d12917d7
generic

cgroup/rstat: validate cpu before css_rstat_cpu() access - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6

Vendor Advisories for CVE-2026-64036(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-07-26ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-07-26ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 26× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-27 10:39 UTCGHSA enrichment
  2. 2026-07-26 22:47 UTCEG score recompute
  3. 2026-07-26 22:47 UTCVendor advisory
  4. 2026-07-26 22:47 UTCGHSA enrichment
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-26 10:56 UTCEG score recompute
  8. 2026-07-26 10:56 UTCVendor advisory
  9. 2026-07-26 10:56 UTCGHSA enrichment
  10. 2026-07-25 14:18 UTCEPSS rescore
  11. 2026-07-25 14:18 UTCEPSS rescore
  12. 2026-07-24 14:18 UTCEPSS rescore
  13. 2026-07-24 14:18 UTCEPSS rescore
  14. 2026-07-23 14:18 UTCEPSS rescore
  15. 2026-07-23 14:18 UTCEPSS rescore
  16. 2026-07-23 03:22 UTCEG score recompute
  17. 2026-07-22 14:08 UTCEPSS rescore
  18. 2026-07-22 14:08 UTCEPSS rescore
  19. 2026-07-21 15:25 UTCEPSS rescore
  20. 2026-07-21 15:25 UTCEPSS rescore
  21. 2026-07-20 17:27 UTCEG score recompute
  22. 2026-07-20 17:27 UTCGHSA enrichment
  23. 2026-07-20 17:08 UTCEPSS rescore
  24. 2026-07-20 14:36 UTCEG score recompute▲ 7.80
  25. 2026-07-20 14:36 UTCGHSA enrichment
Show 4 more
  1. 2026-07-20 14:32 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  2. 2026-07-19 17:49 UTCNVD update
  3. 2026-07-19 16:13 UTCEG score recompute
  4. 2026-07-19 16:03 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-64036?
CVE-2026-64036 is a high vulnerability published on July 19, 2026. 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…
When was CVE-2026-64036 disclosed?
CVE-2026-64036 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64036 actively exploited?
CVE-2026-64036 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.2% of all scored CVEs.
What is the CVSS score of CVE-2026-64036?
CVE-2026-64036 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-64036?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64036, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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