CVE-2026-46328

CPU-limit bypass via stale POSIX timer state

Published Jun 9, 2026 · Updated Jun 9, 2026

Resource-limit enforcement failure in affected Linux Kernel releases from 4.10 allows local users to bypass AppArmor CPU limits on exec. In security/apparmor/resource.c, the profile-transition path changes RLIMIT_CPU without refreshing the POSIX CPU timer's cached next-expiration state. A confined local process must be allowed to execute into a profile with a different CPU limit; stale state then permits excess CPU use or sends premature SIGXCPU, terminating the process.

CVSS severity7.3
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-limit enforcement failure in affected Linux Kernel releases from 4.10 allows local users to bypass AppArmor CPU limits on exec. In security/apparmor/resource.c, the profile-transition path changes RLIMIT_CPU without refreshing the POSIX CPU timer's cached next-expiration state. A confined local process must be allowed to execute into a profile with a different CPU limit; stale state then permits excess CPU use or sends premature SIGXCPU, terminating the process.

The record

CVE
CVE-2026-46328
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1496.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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=4.10
  2. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <1f736dfe27c857b78f8461cd7c3dd9640be74b37
  3. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <2232d7cd243833ad750cae656d1817fe43744a09
  4. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <28aa93fcfb33b6d580c5df4ae8b6d13fb0e6fcd3
  5. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <57d51d41b90eface809b72e0e009b50546492f1f
  6. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <6ca56813f4a589f536adceb42882855d91fb1125
  7. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <9bf1fa150775b0c6b794e4b6a2c0395e13777999
  8. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <e1cc11550b2f66687a374536c9dfdddcefca0efe
  9. Affected versionversion=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <e43818b16815c0c2bf933ef28316f8e704e5e0ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.10; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <1f736dfe27c857b78f8461cd7c3dd9640be74b37; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <2232d7cd243833ad750cae656d1817fe43744a09; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <28aa93fcfb33b6d580c5df4ae8b6d13fb0e6fcd3; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <57d51d41b90eface809b72e0e009b50546492f1f; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <6ca56813f4a589f536adceb42882855d91fb1125; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <9bf1fa150775b0c6b794e4b6a2c0395e13777999; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <e1cc11550b2f66687a374536c9dfdddcefca0efe; version=baa73d9e478ff32d62f3f9422822b59dd9a95a21 <e43818b16815c0c2bf933ef28316f8e704e5e0ef

Published CVSS scores

7.3kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/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

T1496.001Compute Hijacking

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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