CVE-2025-37777

ksmbd: fix use-after-free in __smb2_lease_break_noti()

HIGH

7.8

CVSS Score

Published: May 1, 2025 at 01:07 PM UTC

Updated: August 5, 2026 at 12:44 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 __smb2_lease_break_noti() Move tcp_transport free to ksmbd_conn_free. If ksmbd connection is referenced when ksmbd server thread terminates, It will not be freed, but conn->tcp_transport is freed. __smb2_lease_break_noti can be performed asynchronously when the connection is disconnected. __smb2_lease_break_noti calls ksmbd_conn_write, which can cause use-after-free when conn->ksmbd_transport is already freed.

Affected

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

Linux Kernel · Linux

95%

5.15 ≤ v < 6.12.265.15 ≤ v < 6.14.45.15 ≤ v < 6.155.15 ≤ v < 6.6.1016.13 ≤ v < 6.14.46.7 ≤ v < 6.12.266.15 rc1 6.15 rc2626e6641f6b467447c81dd7678a69c66f7746cf

Vendor states this is fixed in 1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e (fixed)

Vendor states this is fixed in 1da8bd9a10ecd718692732294d15fd801c0eabb5 (fixed)

Vendor states this is fixed in 21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de (fixed)

Vendor states this is fixed in e59796fc80603bcd8569d4d2e10b213c1918edb4 (fixed)

Vendor states this is fixed in 5.15 (unaffected)

Vendor states this is fixed in 6.12.26 (unaffected)

Vendor states this is fixed in 6.14.4 (unaffected)

Vendor states this is fixed in 6.15 (unaffected)

Vendor states this is fixed in 6.6.101 (unaffected)