CVE-2026-72404

Kernel crash via premature TIPC cache destruction

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in the TIPC UDP media bearer in Linux 5.3 through 7.1.4 allows local users to crash the kernel during bearer teardown. The cleanup_bearer() path destroys replicast destination caches before synchronize_net() drains RCU-protected transmitters, then frees the bearer while a receiver can still start. Concurrent TIPC UDP traffic during bearer removal is required; the resulting stale cache or bearer access can crash the host or corrupt kernel memory.

CVSS severity5.7
Medium
EPSS probability0.15%
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 the TIPC UDP media bearer in Linux 5.3 through 7.1.4 allows local users to crash the kernel during bearer teardown. The cleanup_bearer() path destroys replicast destination caches before synchronize_net() drains RCU-protected transmitters, then frees the bearer while a receiver can still start. Concurrent TIPC UDP traffic during bearer removal is required; the resulting stale cache or bearer access can crash the host or corrupt kernel memory.

The record

CVE
CVE-2026-72404
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, CWE-825
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=5.3
  2. Affected versionversion=e9c1a793210f29f32ee4cf048e04d7d9bb3221cc <1c8393eefa3cadf4ca0b61119ad1321aa32d3c8c
  3. Affected versionversion=e9c1a793210f29f32ee4cf048e04d7d9bb3221cc <7116764ca53ff529335d7ab7c364a69f094b23a5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=e9c1a793210f29f32ee4cf048e04d7d9bb3221cc <1c8393eefa3cadf4ca0b61119ad1321aa32d3c8c; version=e9c1a793210f29f32ee4cf048e04d7d9bb3221cc <7116764ca53ff529335d7ab7c364a69f094b23a5

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.7UbuntuCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

CWE-416Use After Free
CWE-825Expired Pointer Dereference

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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