CVE-2026-23193
Unknown Unknown - Not Provided
Use-After-Free Vulnerability in Linux Kernel iSCSI Target Session Management

Publication date: 2026-02-14

Last updated on: 2026-04-03

Assigner: kernel.org

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.
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Meta Information
Published
2026-02-14
Last Modified
2026-04-03
Generated
2026-06-16
AI Q&A
2026-02-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23193
EUVD
EUVD-2026-6108
Affected Vendors & Products
Showing 12 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.16 (inc) to 6.1.163 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.70 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.124 (exc)
linux linux_kernel 6.19
linux linux_kernel From 6.13 (inc) to 6.18.10 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.200 (exc)
linux linux_kernel From 3.1 (inc) to 5.10.250 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel's iSCSI target code, specifically in the function iscsit_dec_session_usage_count().

The problem occurs because the function calls complete() while still holding a lock (sess->session_usage_lock). The complete() call can wake up a waiter thread that may immediately free the session structure.

As a result, the current thread might try to unlock a spinlock on a session structure that has already been deallocated, causing a kernel address sanitizer (KASAN) slab-use-after-free error.

The fix involves releasing the session_usage_lock before calling complete() to ensure the session structure is not accessed after it has been freed.

Impact Analysis

This vulnerability can lead to a use-after-free condition in the Linux kernel, which may cause system instability, crashes, or potential kernel memory corruption.

Exploitation of this issue could allow an attacker with the ability to trigger the iSCSI target code to cause denial of service or potentially execute arbitrary code within the kernel context.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

The vulnerability is fixed by updating the Linux kernel to a version where the iscsit_dec_session_usage_count() function releases the session_usage_lock before calling complete().

Therefore, the immediate mitigation step is to apply the latest kernel patches or upgrade to a kernel version that includes this fix.

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