linux-cve-announce - CVE-2026-23216: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage

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Message-ID: <2026021800-CVE-2026-23216-6c63@gregkh>
Date: Wed, 18 Feb 2026 15:22:07 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23216: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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().

The Linux kernel CVE team has assigned CVE-2026-23216 to this issue.


Affected and fixed versions
===========================

	Fixed in 5.10.250 with commit ba684191437380a07b27666eb4e72748be1ea201
	Fixed in 5.15.200 with commit 8518f072fc92921418cd9ed4268dd4f3e9a8fd75
	Fixed in 6.1.163 with commit 275016a551ba1a068a3bd6171b18611726b67110
	Fixed in 6.6.124 with commit 73b487d44bf4f92942629d578381f89c326ff77f
	Fixed in 6.12.70 with commit 48fe983e92de2c59d143fe38362ad17ba23ec7f3
	Fixed in 6.18.10 with commit 3835e49e146a4e6e7787b29465f1a23379b6ec44
	Fixed in 6.19 with commit 9411a89e9e7135cc459178fa77a3f1d6191ae903

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-23216
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/target/iscsi/iscsi_target_util.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/ba684191437380a07b27666eb4e72748be1ea201
	https://git.kernel.org/stable/c/8518f072fc92921418cd9ed4268dd4f3e9a8fd75
	https://git.kernel.org/stable/c/275016a551ba1a068a3bd6171b18611726b67110
	https://git.kernel.org/stable/c/73b487d44bf4f92942629d578381f89c326ff77f
	https://git.kernel.org/stable/c/48fe983e92de2c59d143fe38362ad17ba23ec7f3
	https://git.kernel.org/stable/c/3835e49e146a4e6e7787b29465f1a23379b6ec44
	https://git.kernel.org/stable/c/9411a89e9e7135cc459178fa77a3f1d6191ae903