Improper resource shutdown or release in Linux kernel - CVE-2026-64092

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Main Vulnerability Database Vulnerabilities #VU138539

Improper resource shutdown or release in Linux kernel - CVE-2026-64092

Published: July 20, 2026


Vulnerability identifier: #VU138539
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64092
CWE-ID: CWE-404
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource shutdown handling in the batman-adv tp_meter receiver shutdown logic when stopping receiver sessions and handling timer expiration. A local user can trigger the affected code path to cause a denial of service.

The issue arises from a reference leak involving tp_vars during coordination between batadv_tp_receiver_shutdown() and batadv_tp_stop_all().


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-aws (Ubuntu package)

How to mitigate CVE-2026-64092

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 6.8.0-139.139+fips1, 6.8.0-1049.53, 6.8.0-1062.65+fips1, 6.8.0-1062.65.1, 6.8.0-1062.65~22.04.1, 6.8.0-1062.70, 6.8.0-1064.68, 6.8.0-1067.75, 6.8.0-1067.75+fips1, 6.8.1-1059.60, 6.8.1-1059.60~22.04.1
linux-lowlatency (Ubuntu package) - addressed in versions 6.8.0-139.139.1, 6.8.0-139.139.1~22.04.1
linux-oracle (Ubuntu package) - addressed in versions 6.8.0-1061.64, 6.8.0-1061.64~22.04.1
linux-aws-fips (Ubuntu package) - update to 6.8.0-1064.67+fips1
linux-aws (Ubuntu package) - update to 6.8.0-1064.67~22.04.1

External References

Related Security Bulletins