🛡️ AZL-53376 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2024-50147 affecting package kernel for versions less than 6.6.64.2-1

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

net/mlx5: Fix command bitmask initialization

Command bitmask have a dedicated bit for MANAGE_PAGES command, this bit

isn't Initialize during command bitmask Initialization, only during

MANAGE_PAGES.

In addition, mlx5_cmd_trigger_completions() is trying to trigger

completion for MANAGE_PAGES command as well.

Hence, in case health error occurred before any MANAGE_PAGES command

have been invoke (for example, during mlx5_enable_hca()),

mlx5_cmd_trigger_completions() will try to trigger completion for

MANAGE_PAGES command, which will result in null-ptr-deref error.[1]

Fix it by Initialize command bitmask correctly.

While at it, re-write the code for better understanding.

[1]

BUG: KASAN: null-ptr-deref in mlx5_cmd_trigger_completions+0x1db/0x600 [mlx5_core]

Write of size 4 at addr 0000000000000214 by task kworker/u96:2/12078

CPU: 10 PID: 12078 Comm: kworker/u96:2 Not tainted 6.9.0-rc2_for_upstream_debug_2024_04_07_19_01 #1

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014

Workqueue: mlx5_health0000:08:00.0 mlx5_fw_fatal_reporter_err_work [mlx5_core]

Call Trace:

<TASK>

dump_stack_lvl+0x7e/0xc0

kasan_report+0xb9/0xf0

kasan_check_range+0xec/0x190

mlx5_cmd_trigger_completions+0x1db/0x600 [mlx5_core]

mlx5_cmd_flush+0x94/0x240 [mlx5_core]

enter_error_state+0x6c/0xd0 [mlx5_core]

mlx5_fw_fatal_reporter_err_work+0xf3/0x480 [mlx5_core]

process_one_work+0x787/0x1490

? lockdep_hardirqs_on_prepare+0x400/0x400

? pwq_dec_nr_in_flight+0xda0/0xda0

? assign_work+0x168/0x240

worker_thread+0x586/0xd30

? rescuer_thread+0xae0/0xae0

kthread+0x2df/0x3b0

? kthread_complete_and_exit+0x20/0x20

ret_from_fork+0x2d/0x70

? kthread_complete_and_exit+0x20/0x20

ret_from_fork_asm+0x11/0x20

</TASK>

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

AZL-53376 is recorded against 1 package.

  • kernel (fixed in 6.6.64.2-1)

Timeline and source

Published on 7 November 2024 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2024-11-07
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 6.6.64.2-1

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