ksmbd: fix racy issue under cocurrent smb2 tree disconnect (CVE-2023-53358) | HOL Guard CVE

High · CVSS 8.8CVE-2023-53358

ksmbd: fix racy issue under cocurrent smb2 tree disconnect

Answer in brief

CVE-2023-53358 records a High severity (CVSS 8.8) vulnerability in ksmbd: fix racy issue under cocurrent smb2 tree disconnect. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Sep 17, 2025Updated Aug 5, 2026Source checked Sep 19, 2026First seen by HOL Aug 4, 2026Material review Aug 5, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. 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). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=0626e6641f6b467447c81dd7678a69c66f7746cf <b36295c17fb97424406f0c3ab321b1ccaabb9be8 \|\| >=0626e6641f6b467447c81dd7678a69c66f7746cf <bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6 \|\| >=0626e6641f6b467447c81dd7678a69c66f7746cf <dc1c17716c099c90948ebb83e2170dd75a3be6b6 \|\| >=0626e6641f6b467447c81dd7678a69c66f7746cf <39366b47a59d46af15ac57beb0996268bf911f6a \|\| >=0626e6641f6b467447c81dd7678a69c66f7746cf <30210947a343b6b3ca13adc9bfc88e1543e16dd5	b36295c17fb97424406f0c3ab321b1ccaabb9be8, bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6, dc1c17716c099c90948ebb83e2170dd75a3be6b6, 39366b47a59d46af15ac57beb0996268bf911f6a, 30210947a343b6b3ca13adc9bfc88e1543e16dd5
Linux/Linuxgeneric	5.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to b36295c17fb97424406f0c3ab321b1ccaabb9be8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 4, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix racy issue under cocurrent smb2 tree disconnect There is UAF issue under cocurrent smb2 tree disconnect. This patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent access.

Quoted source text, attributed separately from HOL analysis.