CVE-2026-23226

ksmbd: add chann_lock to protect ksmbd_chann_list xarray

HIGH

7.8

CVSS Score

Published: February 18, 2026 at 02:53 PM UTC

Updated: October 21, 2026 at 01:18 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.5%

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add chann_lock to protect ksmbd_chann_list xarray ksmbd_chann_list xarray lacks synchronization, allowing use-after-free in multi-channel sessions (between lookup_chann_list() and ksmbd_chann_del). Adds rw_semaphore chann_lock to struct ksmbd_session and protects all xa_load/xa_store/xa_erase accesses.

Affected

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

Linux Kernel · Linux

95%

6.19 ≤ v < 6.19.16.3 ≤ v < 6.18.111d9c4172110e645b383ff13eee759728d74f1a5d5.15.145 6.1.29 6.2.16 6.3853c416710b075153c1e1421e099ffbe5dac68ce91bbf9cb2387a0d76322e9a343bc6bc160f66b3fb1caecbf34b8c8260d851ec4efde71f3694460b7

Vendor states this is fixed in 36ef605c0395b94b826a8c8d6f2697071173de6e (fixed)

Vendor states this is fixed in 4c2ca31608521895dd742a43beca4b4d29762345 (fixed)

Vendor states this is fixed in 4f3a06cc57976cafa8c6f716646be6c79a99e485 (fixed)

Vendor states this is fixed in e4a8a96a93d08570e0405cfd989a8a07e5b6ff33 (fixed)

Affected range stops below 5.16, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 6.12.77 (unaffected)

Vendor states this is fixed in 6.18.11 (unaffected)

Vendor states this is fixed in 6.19.1 (unaffected)

Affected range stops below 6.2, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 6.3 (unaffected)

Vendor states this is fixed in 6.6.160 (unaffected)

Vendor states this is fixed in 7.0 (unaffected)