SB20260727199 - Improper update of reference count in Linux kernel base firmware_loader driver
Published: July 27, 2026
Security Bulletin ID
SB20260727199
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper update of reference count (CVE-ID: CVE-2026-64376)
CWE-ID: CWE-911 - Improper Update of Reference Count
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper reference count management in firmware_upload_register() in drivers/base/firmware_loader/sysfs_upload.c when handling an error after alloc_lookup_fw_priv() fails. A local user can trigger the vulnerable error path to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574
- https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384
- https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe
- https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0
- https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696
- https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45