CVE-2026-23319

Kernel crash via BPF trampoline use-after-free

Published Mar 25, 2026 · Updated Mar 25, 2026

Use-after-free in Linux Kernel BPF trampoline code from 6.0 allows local users to crash the system by racing cgroup shim link release. bpf_link_put can drop a shim link's reference count to zero while cgroup_shim_find still exposes it through tr->progs_hlist before deferred unlinking completes. A local low-privileged user must win this release-and-lookup race; the demonstrated consequence is a kernel crash.

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

Use-after-free in Linux Kernel BPF trampoline code from 6.0 allows local users to crash the system by racing cgroup shim link release. bpf_link_put can drop a shim link's reference count to zero while cgroup_shim_find still exposes it through tr->progs_hlist before deferred unlinking completes. A local low-privileged user must win this release-and-lookup race; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2026-23319
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.0
  2. Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <3eeddb80191f7626ec1ef742bfff51ec3b0fa5c2
  3. Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <4e8a0005d633a4adc98e3b65d5080f93b90d356b
  4. Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <529e685e522b9d7fb379dbe6929dcdf520e34c8c
  5. Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <56145d237385ca0e7ca9ff7b226aaf2eb8ef368b
  6. Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <9b02c5c4147f8af8ed783c8deb5df927a55c3951
  7. Affected versionversion=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <cfcfa0ca0212162aa472551266038e8fd6768cff

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <3eeddb80191f7626ec1ef742bfff51ec3b0fa5c2; version=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <4e8a0005d633a4adc98e3b65d5080f93b90d356b; version=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <529e685e522b9d7fb379dbe6929dcdf520e34c8c; version=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <56145d237385ca0e7ca9ff7b226aaf2eb8ef368b; version=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <9b02c5c4147f8af8ed783c8deb5df927a55c3951; version=69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e <cfcfa0ca0212162aa472551266038e8fd6768cff

Published CVSS scores

7.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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