linux-cve-announce - CVE-2023-54154: scsi: target: core: Fix target_cmd

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Message-ID: <2025122427-CVE-2023-54154-bc1e@gregkh>
Date: Wed, 24 Dec 2025 14:07:51 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54154: scsi: target: core: Fix target_cmd_counter leak

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

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

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

scsi: target: core: Fix target_cmd_counter leak

The target_cmd_counter struct allocated via target_alloc_cmd_counter() is
never freed, resulting in leaks across various transport types, e.g.:

 unreferenced object 0xffff88801f920120 (size 96):
  comm "sh", pid 102, jiffies 4294892535 (age 713.412s)
  hex dump (first 32 bytes):
    07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 38 01 92 1f 80 88 ff ff  ........8.......
  backtrace:
    [<00000000e58a6252>] kmalloc_trace+0x11/0x20
    [<0000000043af4b2f>] target_alloc_cmd_counter+0x17/0x90 [target_core_mod]
    [<000000007da2dfa7>] target_setup_session+0x2d/0x140 [target_core_mod]
    [<0000000068feef86>] tcm_loop_tpg_nexus_store+0x19b/0x350 [tcm_loop]
    [<000000006a80e021>] configfs_write_iter+0xb1/0x120
    [<00000000e9f4d860>] vfs_write+0x2e4/0x3c0
    [<000000008143433b>] ksys_write+0x80/0xb0
    [<00000000a7df29b2>] do_syscall_64+0x42/0x90
    [<0000000053f45fb8>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Free the structure alongside the corresponding iscsit_conn / se_sess
parent.

The Linux kernel CVE team has assigned CVE-2023-54154 to this issue.


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

	Issue introduced in 6.1.28 with commit 76b77646f17118f5babe93c032e6b7a53bbde3b9 and fixed in 6.1.55 with commit 1cd41d1669bcbc5052afa897f85608a62ff3fb30
	Issue introduced in 6.4 with commit becd9be6069e7b183c084f460f0eb363e43cc487 and fixed in 6.5.5 with commit f84639c5ac5f4f95b3992da1af4ff382ebf2e819
	Issue introduced in 6.4 with commit becd9be6069e7b183c084f460f0eb363e43cc487 and fixed in 6.6 with commit d14e3e553e05cb763964c991fe6acb0a6a1c6f9c
	Issue introduced in 6.2.15 with commit bc5ebf93ae23a928303b3643c6f4c4da2f769e7c
	Issue introduced in 6.3.2 with commit 1eaaf1b828cdaa58abccc68962d24005fd5e8852

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-2023-54154
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/target_core_transport.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/1cd41d1669bcbc5052afa897f85608a62ff3fb30
	https://git.kernel.org/stable/c/f84639c5ac5f4f95b3992da1af4ff382ebf2e819
	https://git.kernel.org/stable/c/d14e3e553e05cb763964c991fe6acb0a6a1c6f9c