CVE-2026-53381 json
virtiofs: fix UAF on submount umount
published 2026-07-19 3 mo ago modified 2026-10-19 20 d ago also EUVD-2026-45503
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18, 6.18.37, 7.0.14, 7.1.2, 7.2
- linux Debian 12 6.1.177-1
- linux Debian 13 6.12.95-1
- linux Debian 14 7.0.14-1
debian advisories DEBIAN-CVE-2026-53381
- linux Ubuntu 22.04 LTS 5.15.0-198.208
- linux Ubuntu 24.04 LTS 6.8.0-147.147
- linux Ubuntu 26.04 LTS 7.0.0-31.31
- linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
- linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
- linux-aws Ubuntu 26.04 LTS 7.0.0-1012.12
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
- linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79
ubuntu advisories UBUNTU-CVE-2026-53381
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel-livepatch-SLE16-RT_Update_5 Linux Micro 6.2 14-160000.1.1
- kernel-livepatch-SLE16-RT_Update_12 Linux Micro 6.2 8-160000.1.1
- kernel-livepatch-SLE16-RT_Update_11 Linux Micro 6.2 10-160000.1.1
- kernel-livepatch-SLE16-RT_Update_10 Linux Micro 6.2 10-160000.1.1
- kernel-livepatch-SLE16-RT_Update_9 Linux Micro 6.2 10-160000.1.1
- kernel-livepatch-SLE16-RT_Update_8 Linux Micro 6.2 11-160000.1.1
- kernel-livepatch-SLE16-RT_Update_7 Linux Micro 6.2 12-160000.1.1
- kernel-livepatch-SLE16-RT_Update_6 Linux Micro 6.2 13-160000.1.1
suse advisories SUSE-SU-2026:5059-1SUSE-SU-2026:5058-1SUSE-SU-2026:5055-1SUSE-SU-2026:5053-1SUSE-SU-2026:5020-1SUSE-SU-2026:24534-1
- kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
- dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
- kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
- kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
- kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
- kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
- kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
- kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1
opensuse advisories openSUSE-SU-2026:21555-1openSUSE-SU-2026:11339-1
- git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42 commit
- git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e commit
- git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce commit
- git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe commit
- git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f commit
- git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 commit
- git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b commit
- git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f commit
- git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-53381 updated cvss 4.7
kernel: virtiofs: fix UAF on submount umount
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 moreaffected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernelnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 23 d ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Weakness
-
- CWE-416 Use After Free
- Technology feeds
References
-
git.kernel.org
/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42
patch
-
git.kernel.org
/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e
patch
-
git.kernel.org
/stable/c/0b809199ff87c44487e516a725dd4be2185712ce
patch
-
git.kernel.org
/stable/c/2181a09ba980f142650fb053666350ead4471cfe
patch
-
git.kernel.org
/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f
patch
-
git.kernel.org
/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9
patch
-
git.kernel.org
/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b
patch
-
git.kernel.org
/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f
patch
-
git.kernel.org
/stable/c/06b41351779e9289e8785694ade9042ae85e41ea
patch
Sources
- CVE List CVE-2026-53381
- NVD CVE-2026-53381
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.