CVE-2026-23193

In the Linux kernel, the following vulnerability has been resolved:

scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()

In iscsit_dec_session_usage_count(), the function calls complete() while holding the sess->session_usage_lock. Similar to the connection usage count logic, the waiter signaled by complete() (e.g., in the session release path) may wake up and free the iscsit_session structure immediately.

This creates a race condition where the current thread may attempt to execute spin_unlock_bh() on a session structure that has already been deallocated, resulting in a KASAN slab-use-after-free.

To resolve this, release the session_usage_lock before calling complete() to ensure all dereferences of the sess pointer are finished before the waiter is allowed to proceed with deallocation.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/11ebafffce31efc6abeb28c509017976fc49f1ca
• https://git.kernel.org/stable/c/2b64015550a13bcc72910be0565548d9a754d46d
• https://git.kernel.org/stable/c/41b86a9ec037bd3435d68dd3692f0891a207e7e7
• https://git.kernel.org/stable/c/4530f4e4d0e6a207110b0ffed0c911bca43531a4
• https://git.kernel.org/stable/c/84dc6037390b8607c5551047d3970336cb51ba9a
• https://git.kernel.org/stable/c/d8dbdc146e9e9a976931b78715be2e91299049f9
• https://git.kernel.org/stable/c/fd8b0900173307039d3a84644c2fee041a7ed4fb