7.8

CVE-2026-53381: virtiofs: fix UAF on submount umount

Modified
AliasesUBUNTU-CVE-2026-53381DEBIAN-CVE-2026-53381
Published 19-07-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-53381 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 41 · Related 40
MGASA-2026-0312OPENSUSE-SU-2026:11339-1OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23221-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.14% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 548e1f2bac1d4df91a6138f26bb4ab00323fd948, < 607a1d4c42f649e6197567c0448fd9ebb316cd42 | ≥ cfd1aa3e2b71f3327cb373c45a897c9028c62b35, < 1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e | ≥ 83b375c6efef69b1066ad2d79601221e7892745a, < 0b809199ff87c44487e516a725dd4be2185712ce | ≥ bfd17b6138df0122a95989457d8e18ce0b86165e, < 2181a09ba980f142650fb053666350ead4471cfe | ≥ b26923512dbe57ae4917bafd31396d22a9d1691a, < 97c4691653d145dcc699eca5d3aba3219a520f1f | ≥ 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < 2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 | ≥ 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < 39a2b95e008665c14f84e50ed411d898df7cd11b | ≥ 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < e09412a714bcd49375198427bb4aa005037a9d6f | ≥ 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < 06b41351779e9289e8785694ade9042ae85e41ea | f19a1390af448d9e193c08e28ea5f727bf3c3049 | ≥ 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 | 6.18
  • 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
Debian1 product
  • linux< 6.1.177-1 | < 6.12.95-1 | < 7.0.14-1

3 vendors · 160 products

References

33 links
Show all 33 references