What’s Vulnerable › Vulnerabilities

CVE-2026-23226: ksmbd: add chann_lock to protect ksmbd_chann_list xarray

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-18 · updated 2026-10-30
• Weakness: CWE-416

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 products

• Linux kernel: from 6.3 before 6.18.11; from 6.19 before 6.19.1 — fixed in 6.18.11, 6.19.1
• Linux: from 6.1.29 before 6.1.191; from 5.15.145 before 5.16; from 6.2.16 before 6.3 — fixed in 6.1.191, 5.16, 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.18.11, 6.19.1; Linux 6.1.191, 5.16, 6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/36ef605c0395b94b826a8c8d6f2697071173de6e
• https://git.kernel.org/stable/c/43ad494ac6e940a8eabf25d5bd77bb3bb53b1153
• https://git.kernel.org/stable/c/4c2ca31608521895dd742a43beca4b4d29762345
• https://git.kernel.org/stable/c/4f3a06cc57976cafa8c6f716646be6c79a99e485
• https://git.kernel.org/stable/c/c00f3938f7ac52770907768e440cf253af9cbb63
• https://git.kernel.org/stable/c/e4a8a96a93d08570e0405cfd989a8a07e5b6ff33

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