CVE-2026-23216

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

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

In iscsit_dec_conn_usage_count(), the function calls complete() while holding the conn->conn_usage_lock. As soon as complete() is invoked, the waiter (such as iscsit_close_connection()) may wake up and proceed to free the iscsit_conn structure.

If the waiter frees the memory before the current thread reaches spin_unlock_bh(), it results in a KASAN slab-use-after-free as the function attempts to release a lock within the already-freed connection structure.

Fix this by releasing the spinlock before calling complete().

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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.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/275016a551ba1a068a3bd6171b18611726b67110
• https://git.kernel.org/stable/c/3835e49e146a4e6e7787b29465f1a23379b6ec44
• https://git.kernel.org/stable/c/48fe983e92de2c59d143fe38362ad17ba23ec7f3
• https://git.kernel.org/stable/c/73b487d44bf4f92942629d578381f89c326ff77f
• https://git.kernel.org/stable/c/8518f072fc92921418cd9ed4268dd4f3e9a8fd75
• https://git.kernel.org/stable/c/9411a89e9e7135cc459178fa77a3f1d6191ae903
• https://git.kernel.org/stable/c/ba684191437380a07b27666eb4e72748be1ea201