linux-cve-announce - CVE-2022-50315: ata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX

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Message-ID: <2025091500-CVE-2022-50315-a3b8@gregkh>
Date: Mon, 15 Sep 2025 16:46:17 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50315: ata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX_PORTS

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

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

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

ata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX_PORTS

UBSAN complains about array-index-out-of-bounds:
[ 1.980703] kernel: UBSAN: array-index-out-of-bounds in /build/linux-9H675w/linux-5.15.0/drivers/ata/libahci.c:968:41
[ 1.980709] kernel: index 15 is out of range for type 'ahci_em_priv [8]'
[ 1.980713] kernel: CPU: 0 PID: 209 Comm: scsi_eh_8 Not tainted 5.15.0-25-generic #25-Ubuntu
[ 1.980716] kernel: Hardware name: System manufacturer System Product Name/P5Q3, BIOS 1102 06/11/2010
[ 1.980718] kernel: Call Trace:
[ 1.980721] kernel: <TASK>
[ 1.980723] kernel: show_stack+0x52/0x58
[ 1.980729] kernel: dump_stack_lvl+0x4a/0x5f
[ 1.980734] kernel: dump_stack+0x10/0x12
[ 1.980736] kernel: ubsan_epilogue+0x9/0x45
[ 1.980739] kernel: __ubsan_handle_out_of_bounds.cold+0x44/0x49
[ 1.980742] kernel: ahci_qc_issue+0x166/0x170 [libahci]
[ 1.980748] kernel: ata_qc_issue+0x135/0x240
[ 1.980752] kernel: ata_exec_internal_sg+0x2c4/0x580
[ 1.980754] kernel: ? vprintk_default+0x1d/0x20
[ 1.980759] kernel: ata_exec_internal+0x67/0xa0
[ 1.980762] kernel: sata_pmp_read+0x8d/0xc0
[ 1.980765] kernel: sata_pmp_read_gscr+0x3c/0x90
[ 1.980768] kernel: sata_pmp_attach+0x8b/0x310
[ 1.980771] kernel: ata_eh_revalidate_and_attach+0x28c/0x4b0
[ 1.980775] kernel: ata_eh_recover+0x6b6/0xb30
[ 1.980778] kernel: ? ahci_do_hardreset+0x180/0x180 [libahci]
[ 1.980783] kernel: ? ahci_stop_engine+0xb0/0xb0 [libahci]
[ 1.980787] kernel: ? ahci_do_softreset+0x290/0x290 [libahci]
[ 1.980792] kernel: ? trace_event_raw_event_ata_eh_link_autopsy_qc+0xe0/0xe0
[ 1.980795] kernel: sata_pmp_eh_recover.isra.0+0x214/0x560
[ 1.980799] kernel: sata_pmp_error_handler+0x23/0x40
[ 1.980802] kernel: ahci_error_handler+0x43/0x80 [libahci]
[ 1.980806] kernel: ata_scsi_port_error_handler+0x2b1/0x600
[ 1.980810] kernel: ata_scsi_error+0x9c/0xd0
[ 1.980813] kernel: scsi_error_handler+0xa1/0x180
[ 1.980817] kernel: ? scsi_unjam_host+0x1c0/0x1c0
[ 1.980820] kernel: kthread+0x12a/0x150
[ 1.980823] kernel: ? set_kthread_struct+0x50/0x50
[ 1.980826] kernel: ret_from_fork+0x22/0x30
[ 1.980831] kernel: </TASK>

This happens because sata_pmp_init_links() initialize link->pmp up to
SATA_PMP_MAX_PORTS while em_priv is declared as 8 elements array.

I can't find the maximum Enclosure Management ports specified in AHCI
spec v1.3.1, but "12.2.1 LED message type" states that "Port Multiplier
Information" can utilize 4 bits, which implies it can support up to 16
ports. Hence, use SATA_PMP_MAX_PORTS as EM_MAX_SLOTS to resolve the
issue.

BugLink: https://bugs.launchpad.net/bugs/1970074

The Linux kernel CVE team has assigned CVE-2022-50315 to this issue.


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

	Fixed in 4.9.332 with commit f70bd4339cb68bc7e206af4c922bc0d249244403
	Fixed in 4.14.298 with commit da2ea4a961d9f89ed248734e7032350c260dc3a3
	Fixed in 4.19.264 with commit 67a00c299c5c143817c948fbc7de1a2fa1af38fb
	Fixed in 5.4.221 with commit 383b7c50f5445ff8dbbf03080905648d6980c39d
	Fixed in 5.10.152 with commit 303d0f761431d848dd8d7ff9fd9b8c101879cabe
	Fixed in 5.15.76 with commit 8fbe13de1cc7cef2564be3cbf60400b33eee023b
	Fixed in 6.0.6 with commit d6314d5f68764550c84d732ce901ddd3ac6b415f
	Fixed in 6.1 with commit 1e41e693f458eef2d5728207dbd327cd3b16580a

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-2022-50315
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/ata/ahci.h


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/f70bd4339cb68bc7e206af4c922bc0d249244403
	https://git.kernel.org/stable/c/da2ea4a961d9f89ed248734e7032350c260dc3a3
	https://git.kernel.org/stable/c/67a00c299c5c143817c948fbc7de1a2fa1af38fb
	https://git.kernel.org/stable/c/383b7c50f5445ff8dbbf03080905648d6980c39d
	https://git.kernel.org/stable/c/303d0f761431d848dd8d7ff9fd9b8c101879cabe
	https://git.kernel.org/stable/c/8fbe13de1cc7cef2564be3cbf60400b33eee023b
	https://git.kernel.org/stable/c/d6314d5f68764550c84d732ce901ddd3ac6b415f
	https://git.kernel.org/stable/c/1e41e693f458eef2d5728207dbd327cd3b16580a