Bug 2440675 (CVE-2026-23226)

Summary: CVE-2026-23226 kernel: ksmbd: add chann_lock to protect ksmbd_chann_list xarray
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2026-02-18 16:04:08 UTC 
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.
Comment 1 Keith Grant 2026-02-18 20:27:38 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021807-CVE-2026-23226-438c@gregkh/T