CVE-2026-53381 Details
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.
A use-after-free vulnerability has been identified in the Linux kernel's virtiofs implementation, specifically related to the handling of submount unmounting. This issue arises when the 'iput()' function is called from 'fuse_release_end()', potentially leading to a system crash (Oops) if the superblock has already been destroyed. Typically, this situation is avoided by ensuring that the number of waiting requests drops to zero before initiating the superblock shutdown. However, this mechanism only works for the final submount instance, as the wait counter is connection-specific rather than superblock-specific. The vulnerability can be exploited by reverting to synchronous release requests for the auto_submounts case, which currently affects virtiofs only.
Users can update to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched kernel can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea | kernel.org | Patch |
| https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce | kernel.org | Patch |
| https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e | kernel.org | Patch |
| https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe | kernel.org | Patch |
| https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b | kernel.org | Patch |
| https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42 | kernel.org | Patch |
| https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f | kernel.org | Patch |
| https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.10.246, < 5.10.260 >= 5.15.196, < 5.15.211 >= 6.1.158, < 6.1.177 >= 6.6.115, < 6.6.144 >= 6.12.54, < 6.12.95 >= 6.17.4, < 6.18.37 >= 6.19, < 7.0.14 >= 7.1, < 7.1.2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 29, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |