Improper control of a resource through its lifetime in Linux kernel - CVE-2026-92502

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Main Vulnerability Database Vulnerabilities #VU151019

Improper control of a resource through its lifetime in Linux kernel - CVE-2026-92502

Published: September 18, 2026


Vulnerability identifier: #VU151019
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-92502
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local privileged user to cause data loss.

The vulnerability exists due to improper clearing of stale xarray tags in ext4 writeback handling when clean folios are skipped during writeback. A local privileged user can trigger writeback during a system reboot to cause data loss.

The issue occurs in ext4 data=journal mode while the superblock is being remounted read-only during reboot.


Affected software

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-realtime (Ubuntu package)
linux-fips (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-ibm-6.8 (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-gke (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp (Ubuntu package)
linux (Debian package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

How to mitigate CVE-2026-92502

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 6.8.0-146.146, 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-aws (Ubuntu package) - update to 6.8.0-1066.69
linux-realtime (Ubuntu package) - update to 6.8.1-1061.62
linux-fips (Ubuntu package) - update to 6.8.0-146.146+fips1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1066.69~22.04.1
linux-ibm-6.8 (Ubuntu package) - update to 6.8.0-1066.67~22.04.1
linux-gcp-6.8 (Ubuntu package) - update to 6.8.0-1070.78~22.04.1
linux-aws-fips (Ubuntu package) - update to 6.8.0-1066.69+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1070.78+fips1
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1061.62~22.04.1
linux-gke (Ubuntu package) - addressed in versions 6.8.0-146.146.1~22.04.1, 6.8.0-146.146.1, 6.8.0-1051.55, 6.8.0-1063.66, 6.8.0-1064.67~22.04.1, 6.8.0-1064.67, 6.8.0-1064.67.1, 6.8.0-1065.73, 6.8.0-1066.67
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1068.75~22.04.1, 6.8.0-1068.75, 6.8.0-1069.77+fips1, 6.8.0-1070.78~22.04.1, 6.8.0-1070.78, 7.0.0-1016.16, 7.0.0-1017.17
linux-gcp (Ubuntu package) - update to 6.8.0-1070.78
linux (Debian package) - update to 6.12.111-1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

External References

Related Security Bulletins