CVE-2026-53381
virtiofs: fix UAF on submount umount
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.
INFO
Published Date :
July 19, 2026, 12:16 p.m.
Last Modified :
July 19, 2026, 12:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-53381
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to a patched version.
- Apply security patches for virtiofs.
- Revert to synchronous release for auto_submounts.
- Test the fix in a non-production environment.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53381.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53381 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53381
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53381 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53381 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '548e1f2bac1d4df91a6138f26bb4ab00323fd948', 'lessThan': '607a1d4c42f649e6197567c0448fd9ebb316cd42', 'versionType': 'git'}, {'status': 'affected', 'version': 'cfd1aa3e2b71f3327cb373c45a897c9028c62b35', 'lessThan': '1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e', 'versionType': 'git'}, {'status': 'affected', 'version': '83b375c6efef69b1066ad2d79601221e7892745a', 'lessThan': '0b809199ff87c44487e516a725dd4be2185712ce', 'versionType': 'git'}, {'status': 'affected', 'version': 'bfd17b6138df0122a95989457d8e18ce0b86165e', 'lessThan': '2181a09ba980f142650fb053666350ead4471cfe', 'versionType': 'git'}, {'status': 'affected', 'version': 'b26923512dbe57ae4917bafd31396d22a9d1691a', 'lessThan': '97c4691653d145dcc699eca5d3aba3219a520f1f', 'versionType': 'git'}, {'status': 'affected', 'version': '26e5c67deb2e1f42a951f022fdf5b9f7eb747b01', 'lessThan': '2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9', 'versionType': 'git'}, {'status': 'affected', 'version': '26e5c67deb2e1f42a951f022fdf5b9f7eb747b01', 'lessThan': '39a2b95e008665c14f84e50ed411d898df7cd11b', 'versionType': 'git'}, {'status': 'affected', 'version': '26e5c67deb2e1f42a951f022fdf5b9f7eb747b01', 'lessThan': 'e09412a714bcd49375198427bb4aa005037a9d6f', 'versionType': 'git'}, {'status': 'affected', 'version': '26e5c67deb2e1f42a951f022fdf5b9f7eb747b01', 'lessThan': '06b41351779e9289e8785694ade9042ae85e41ea', 'versionType': 'git'}, {'status': 'affected', 'version': 'f19a1390af448d9e193c08e28ea5f727bf3c3049', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.246', 'lessThan': '5.10.260', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.196', 'lessThan': '5.15.211', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.1.158', 'lessThan': '6.1.177', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.115', 'lessThan': '6.6.144', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.54', 'lessThan': '6.12.95', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.17.4', 'lessThan': '6.18', 'versionType': 'semver'}], 'programFiles': ['fs/fuse/file.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.260', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.211', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.37', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.14', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1.2', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/fuse/file.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea Added Reference https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce Added Reference https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e Added Reference https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe Added Reference https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 Added Reference https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b Added Reference https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42 Added Reference https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f Added Reference https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f