CVE-2025-68817

ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency

HIGH
7.8
CVSS Score
Published: January 13, 2026 at 03:29 PM UTC
Updated: August 5, 2026 at 12:45 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.4%

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency Under high concurrency, A tree-connection object (tcon) is freed on a disconnect path while another path still holds a reference and later executes *_put()/write on it.

Affected

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

5.15.145 ≤ v < 5.15.1996.1.71 ≤ v < 6.1.1606.13 ≤ v < 6.18.36.6 ≤ v < 6.12.646.6 ≤ v < 6.18.36.6 ≤ v < 6.196.6 ≤ v < 6.6.1206.6.1 ≤ v < 6.6.1206.7 ≤ v < 6.12.6433b235a6e6ebe0f05f3586a71e8d281d00f71e2e5.15.1456.1.716.66.6 rc56.6 rc66.6 rc77b58ee8d0b91359554cf219cd4f33872ea2afd66dd45db4d9bbc8f122a9b4db5ce94ae29fcf03d3c
Vendor states this is fixed in 063cbbc6f595ea36ad146e1b7d2af820894beb21 (fixed)
Vendor states this is fixed in 21a3d01fc6db5129f81edb0ab7cb94fd758bcbea (fixed)
Vendor states this is fixed in 446beed646b2e426dd53d27358365f8678e1dd01 (fixed)
Vendor states this is fixed in b39a1833cc4a2755b02603eec3a71a85e9dff926 (fixed)
Vendor states this is fixed in d092de8a26c952379ded8e6b0bda31d89befac1a (fixed)
Vendor states this is fixed in d64977495e44855f2b28d8ce56107c963a7a50e4 (fixed)
Vendor states this is fixed in 5.15.199 (unaffected)
Vendor states this is fixed in 6.1.160 (unaffected)
Vendor states this is fixed in 6.12.64 (unaffected)
Vendor states this is fixed in 6.18.3 (unaffected)
Vendor states this is fixed in 6.19 (unaffected)
Vendor states this is fixed in 6.6 (unaffected)
Vendor states this is fixed in 6.6.120 (unaffected)

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416

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