CVE-2026-23193 scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()
A use-after-free race condition in the Linux kernel iSCSI target allows attackers to cause denial of service or potentially execute code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23193?
CVE-2026-23193 is a high-severity use after free vulnerability in Linux kernel, published on 14 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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: CWE-416
Which versions are affected by CVE-2026-23193?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23193?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-23193 being exploited?
There is no known exploitation of CVE-2026-23193 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-77718, BELL-CVE-2026-23193, DEBIAN-CVE-2026-23193, GHSA-fccp-g2rw-8q2g, ROOT-OS-DEBIAN-11-CVE-2026-23193, ROOT-OS-DEBIAN-12-CVE-2026-23193 and 4 more.