CVE-2024-50147: net/mlx5: Fix command bitmask initialization
First published: Thu Nov 07 2024(Updated: )
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>
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.1<6.1.115 | |
| Linux Kernel | >=6.2<6.6.59 | |
| Linux Kernel | >=6.7<6.11.6 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/stable/c/d1606090bb294cecb7de3c4ed177f5aa0abd4c4e
- https://git.kernel.org/stable/c/d88564c79d1cedaf2655f12261eca0d2796bde4e
- https://git.kernel.org/stable/c/2feac1e562be0efc621a6722644a90f355d53473
- https://git.kernel.org/stable/c/d62b14045c6511a7b2d4948d1a83a4e592deeb05
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50147
- https://nvd.nist.gov/vuln/detail/CVE-2024-50147
- https://launchpad.net/bugs/cve/CVE-2024-50147
- https://security-tracker.debian.org/tracker/CVE-2024-50147
- https://ubuntu.com/security/CVE-2024-50147
Frequently Asked Questions
What is the severity of CVE-2024-50147?
The severity of CVE-2024-50147 has not been explicitly rated but involves a technical flaw in the Linux kernel's command bitmask initialization.
How does CVE-2024-50147 affect Linux kernel users?
CVE-2024-50147 affects certain versions of the Linux kernel by potentially leading to mismanagement of command bits.
How do I fix CVE-2024-50147?
To fix CVE-2024-50147, users should upgrade their Linux kernel to a patched version that addresses the command bitmask initialization issue.
Which versions of the Linux kernel are affected by CVE-2024-50147?
CVE-2024-50147 affects Linux kernel versions between 6.1 and 6.12-rc3, including several specific release candidates.
Is CVE-2024-50147 exploitable?
While the specifics of exploitation are not detailed, vulnerabilities in command bitmask initialization can have security implications.
- agent/title
- agent/references
- agent/description
- agent/type
- agent/first-publish-date
- agent/author
- agent/event
- agent/weakness
- agent/remedy
- agent/severity
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/source
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- agent/softwarecombine
- agent/tags
- collector/usn-cve
- source/Ubuntu
- vendor/linux
- canonical/linux kernel
- version/linux kernel/6.1
- version/linux kernel/6.2
- version/linux kernel/6.7
- version/linux kernel/6.12-rc1
- version/linux kernel/6.12-rc2
- version/linux kernel/6.12-rc3