CVE-2026-64036

Kernel memory corruption via unchecked BPF CPU index

Published Jul 19, 2026 · Updated Jul 19, 2026

Out-of-bounds access in Linux Kernel allows local users to corrupt kernel memory via a crafted BPF cgroup iterator program. The BPF-facing css_rstat_updated() kfunc uses its caller-supplied CPU index for per-CPU rstat lookups without validating that the CPU is possible. Reaching the write requires CAP_BPF and CAP_PERFMON; an invalid index can disclose or corrupt kernel memory and trigger an oops, panic, or hang.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux Kernel allows local users to corrupt kernel memory via a crafted BPF cgroup iterator program. The BPF-facing css_rstat_updated() kfunc uses its caller-supplied CPU index for per-CPU rstat lookups without validating that the CPU is possible. Reaching the write requires CAP_BPF and CAP_PERFMON; an invalid index can disclose or corrupt kernel memory and trigger an oops, panic, or hang.

The record

CVE
CVE-2026-64036
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.1
  2. Affected versionversion=a319185be9f5ad13c2a296d448ac52ffe45d194c <6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6
  3. Affected versionversion=a319185be9f5ad13c2a296d448ac52ffe45d194c <8817005efbdfdf5d4e4814cb5dc52b53d12917d7
  4. Affected versionversion=a319185be9f5ad13c2a296d448ac52ffe45d194c <fd2bd9fa7700ddf28296486b2598cff2f80cc819

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.1; version=a319185be9f5ad13c2a296d448ac52ffe45d194c <6a01413a4e8fcb0263d7bef5075c5f8f4eb3a8b6; version=a319185be9f5ad13c2a296d448ac52ffe45d194c <8817005efbdfdf5d4e4814cb5dc52b53d12917d7; version=a319185be9f5ad13c2a296d448ac52ffe45d194c <fd2bd9fa7700ddf28296486b2598cff2f80cc819

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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