virtiofs: fix UAF on submount umount

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53381
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:48 UTC
Updated2026-07-20 15:16:40 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001950000 probability, percentile 0.094700000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 548e1f2bac1d4df91a6138f26bb4ab00323fd948 607a1d4c42f649e6197567c0448fd9ebb316cd42 git Not specified
CNA Linux Linux affected cfd1aa3e2b71f3327cb373c45a897c9028c62b35 1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e git Not specified
CNA Linux Linux affected 83b375c6efef69b1066ad2d79601221e7892745a 0b809199ff87c44487e516a725dd4be2185712ce git Not specified
CNA Linux Linux affected bfd17b6138df0122a95989457d8e18ce0b86165e 2181a09ba980f142650fb053666350ead4471cfe git Not specified
CNA Linux Linux affected b26923512dbe57ae4917bafd31396d22a9d1691a 97c4691653d145dcc699eca5d3aba3219a520f1f git Not specified
CNA Linux Linux affected 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 git Not specified
CNA Linux Linux affected 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 39a2b95e008665c14f84e50ed411d898df7cd11b git Not specified
CNA Linux Linux affected 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 e09412a714bcd49375198427bb4aa005037a9d6f git Not specified
CNA Linux Linux affected 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 06b41351779e9289e8785694ade9042ae85e41ea git Not specified
CNA Linux Linux affected f19a1390af448d9e193c08e28ea5f727bf3c3049 git Not specified
CNA Linux Linux affected 5.10.246 5.10.260 semver Not specified
CNA Linux Linux affected 5.15.196 5.15.211 semver Not specified
CNA Linux Linux affected 6.1.158 6.1.177 semver Not specified
CNA Linux Linux affected 6.6.115 6.6.144 semver Not specified
CNA Linux Linux affected 6.12.54 6.12.95 semver Not specified
CNA Linux Linux affected 6.17.4 6.18 semver Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.37 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.14 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1.2 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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