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Copyright ยฉ 2026 HOL DAO LLC. All rights reserved.

Back to active CVEs
Medium ยท CVSS 5.5CVE-2026-46040

inotify: fix watch count leak when fsnotify_add_inode_mark_locked() failsCVE-2026-46040

Answer in brief

CVE-2026-46040 records a Medium severity (CVSS 5.5) vulnerability in inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 27, 2026Updated Oct 15, 2026Source checked Oct 23, 2026First seen by HOL Sep 8, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Medium ยท CVSS 5.5
Exploitation
Not marked as known exploited
Affected software
10 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=1cce1eea0aff51201753fcaca421df825b0813b6 <3ab58cf42c46bf2366d2f55ae5c59299d5e178b7 || >=1cce1eea0aff51201753fcaca421df825b0813b6 <10edf7e0ffdc7faa18e2244b17722c1b882b8273 || >=1cce1eea0aff51201753fcaca421df825b0813b6 <3ad9ccea1b25435f6179b57aa891960beb7ce8f9 || >=1cce1eea0aff51201753fcaca421df825b0813b6 <8bcc1cd237ab5ccfdd102869fa031c541943cf40 || >=1cce1eea0aff51201753fcaca421df825b0813b6 <73ddc8518a32baff6bc17afda4ee1ebae5b4ed12 || >=1cce1eea0aff51201753fcaca421df825b0813b6 <fdaa42ca370d056428e5e171247c8fdce8dff36a || >=1cce1eea0aff51201753fcaca421df825b0813b6 <9e48844f708eb48bae4e79cb21edc097c966306d || >=1cce1eea0aff51201753fcaca421df825b0813b6 <6a320935fa4293e9e599ec9f85dc9eb3be7029f83ab58cf42c46bf2366d2f55ae5c59299d5e178b7, 10edf7e0ffdc7faa18e2244b17722c1b882b8273, 3ad9ccea1b25435f6179b57aa891960beb7ce8f9, 8bcc1cd237ab5ccfdd102869fa031c541943cf40, 73ddc8518a32baff6bc17afda4ee1ebae5b4ed12, fdaa42ca370d056428e5e171247c8fdce8dff36a, 9e48844f708eb48bae4e79cb21edc097c966306d, 6a320935fa4293e9e599ec9f85dc9eb3be7029f8
Linux/Linuxgeneric4.11Not reported
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.7 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.7 <**
Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric>=0 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.7 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP.
  2. 2Review the reported fix. Update Linux/Linux to 3ab58cf42c46bf2366d2f55ae5c59299d5e178b7; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 8, 2026

Sources and claim methodology

  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
NVD-CWE-Other
Source
CVE List V5
Source checked
Oct 23, 2026
References
11 linked sources
Open source record