5.5

CVE-2021-46923: fs/mount_setattr: always cleanup mount_kattr

Modified
AliasesUBUNTU-CVE-2021-46923DEBIAN-CVE-2021-46923
Published 27-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-46923 is a medium (CVSS 5.5) Exposure of Resource to Wrong Sphere vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.21%
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 6 · Related 6
SUSE-SU-2024:0855-1SUSE-SU-2024:0858-1SUSE-SU-2024:0900-1SUSE-SU-2024:0900-2SUSE-SU-2024:0910-1SUSE-SU-2024:0977-1

Timeline

  1. 27-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: fs/mount_setattr: always cleanup mount_kattr Make sure that finish_mount_kattr() is called after mount_kattr was succesfully built in both the success and failure case to prevent leaking any references we took when we built it. We returned early if path lookup failed thereby risking to leak an additional reference we took when building mount_kattr when an idmapped mount was requested.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.21% 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.

Ubuntu62 products
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
  • linux-aws-5.19All versions (No fix recorded)
Linux2 products
  • linux≥ 9caccd41541a6f7d6279928d9f971f6642c361af, < 47b5d0a7532d39e42a938f81e3904268145c341d | ≥ 9caccd41541a6f7d6279928d9f971f6642c361af, < 012e332286e2bb9f6ac77d195f17e74b2963d663 | 5.12
  • linux_kernel≥ 5.12.0, < 5.15.13
Debian1 product
  • linux< 5.15.15-1

3 vendors · 65 products

References

6 links