CVE-2026-53381

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

19/07/2026

Last modified:

29/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved: virtiofs: fix UAF on submount umount iput() called from fuse_release_end() can Oops if the super block has already been destroyed. Normally this is prevented by waiting for num_waiting to go down to zero before commencing with super block shutdown. This only works, however, for the last submount instance, as the wait counter is per connection, not per superblock. Revert to using synchronous release requests for the auto_submounts case, which is virtiofs only at this time.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	5.10.246 (including)	5.10.260 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.15.196 (including)	5.15.211 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.1.158 (including)	6.1.177 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.6.115 (including)	6.6.144 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.12.54 (including)	6.12.95 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.17.4 (including)	6.18.37 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.19 (including)	7.0.14 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	7.1 (including)	7.1.2 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-53381

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools