SB20260727318 - Use-after-free in Linux kernel fuse
Published: July 27, 2026
Security Bulletin ID
SB20260727318
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-64266)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in fuse_ref_folio() in the FUSE subsystem when handling a subsequent copy chain after unlocking the request. A local user can trigger request abort and asynchronous end callback timing to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755
- https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4
- https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3
- https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b
- https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a
- https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5
- https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5
- https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be