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CVE-2025-39720

ksmbd: fix refcount leak causing resource not released

MEDIUM
5.5
CVSS Score
Published: September 5, 2025 at 05:21 PM UTC
Updated: October 19, 2026 at 09:10 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix refcount leak causing resource not released When ksmbd_conn_releasing(opinfo->conn) returns true,the refcount was not decremented properly, causing a refcount leak that prevents the count from reaching zero and the memory from being released.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.15 ≤ v < 6.6.1036.13 ≤ v < 6.16.46.7 ≤ v < 6.12.446.176.17 rc16.17 rc2626e6641f6b467447c81dd7678a69c66f7746cf
Vendor states this is fixed in 36e010bb865fbaa1202fe9bcce3fd486d6db7606 (fixed)
Vendor states this is fixed in 89bb430f621124af39bb31763c4a8b504c9651e2 (fixed)
Vendor states this is fixed in 9a7abce6e8c0e2145b346a6d4abf0d9655e9b0e8 (fixed)
Vendor states this is fixed in a1d2bab4d53368a526c97aba92671dd71814f95a (fixed)
Vendor states this is fixed in 5.15 (unaffected)
Vendor states this is fixed in 6.12.44 (unaffected)
Vendor states this is fixed in 6.16.4 (unaffected)
Vendor states this is fixed in 6.17 (unaffected)
Vendor states this is fixed in 6.6.103 (unaffected)

References (4)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/36e010bb865fbaa1202fe9bcce3fd486d6db7606
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/89bb430f621124af39bb31763c4a8b504c9651e2
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9a7abce6e8c0e2145b346a6d4abf0d9655e9b0e8
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a1d2bab4d53368a526c97aba92671dd71814f95a

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-Other

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