5.5

CVE-2026-46040: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-46040DEBIAN-CVE-2026-46040
Published 27-05-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-46040 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 47 · Related 47
OPENSUSE-SU-2026:10954-1OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1

Timeline

  1. 27-05-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails When fsnotify_add_inode_mark_locked() fails in inotify_new_watch(), the error path calls inotify_remove_from_idr() but does not call dec_inotify_watches() to undo the preceding inc_inotify_watches(). This leaks a watch count, and repeated failures can exhaust the max_user_watches limit with -ENOSPC even when no watches are active. Prior to commit 1cce1eea0aff ("inotify: Convert to using per-namespace limits"), the watch count was incremented after fsnotify_add_mark_locked() succeeded, so this path was not affected. The conversion moved inc_inotify_watches() before the mark insertion without adding the corresponding rollback. Add the missing dec_inotify_watches() call in the error path.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.05 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu158 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136 | < 7.0.0-27.27
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64 | < 7.0.0-1008.8
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < 3ab58cf42c46bf2366d2f55ae5c59299d5e178b7 | ≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < 10edf7e0ffdc7faa18e2244b17722c1b882b8273 | ≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < 3ad9ccea1b25435f6179b57aa891960beb7ce8f9 | ≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < 8bcc1cd237ab5ccfdd102869fa031c541943cf40 | ≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < 73ddc8518a32baff6bc17afda4ee1ebae5b4ed12 | ≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < fdaa42ca370d056428e5e171247c8fdce8dff36a | ≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < 9e48844f708eb48bae4e79cb21edc097c966306d | ≥ 1cce1eea0aff51201753fcaca421df825b0813b6, < 6a320935fa4293e9e599ec9f85dc9eb3be7029f8 | 4.11
  • linux_kernel≥ 4.11, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.140 | ≥ 6.7, < 6.12.86 | ≥ 6.13, < 6.18.27 | ≥ 6.19, < 7.0.4
Debian1 product
  • linux< 6.1.176-1 | < 6.12.86-1 | < 7.0.4-1

3 vendors · 161 products

References

49 links
Show all 49 references