7

CVE-2022-48858

net/mlx5: Fix a race on command flush flow

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

net/mlx5: Fix a race on command flush flow

Fix a refcount use after free warning due to a race on command entry.
Such race occurs when one of the commands releases its last refcount and
frees its index and entry while another process running command flush
flow takes refcount to this command entry. The process which handles
commands flush may see this command as needed to be flushed if the other
process released its refcount but didn't release the index yet. Fix it
by adding the needed spin lock.

It fixes the following warning trace:

refcount_t: addition on 0; use-after-free.
WARNING: CPU: 11 PID: 540311 at lib/refcount.c:25 refcount_warn_saturate+0x80/0xe0
...
RIP: 0010:refcount_warn_saturate+0x80/0xe0
...
Call Trace:
 <TASK>
 mlx5_cmd_trigger_completions+0x293/0x340 [mlx5_core]
 mlx5_cmd_flush+0x3a/0xf0 [mlx5_core]
 enter_error_state+0x44/0x80 [mlx5_core]
 mlx5_fw_fatal_reporter_err_work+0x37/0xe0 [mlx5_core]
 process_one_work+0x1be/0x390
 worker_thread+0x4d/0x3d0
 ? rescuer_thread+0x350/0x350
 kthread+0x141/0x160
 ? set_kthread_struct+0x40/0x40
 ret_from_fork+0x1f/0x30
 </TASK>
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 5.4.185
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.106
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.29
Linux ≫ Linux Kernel Version >= 5.16 < 5.16.15
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.18% 0.074
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/0401bfb27a91d7bdd74b1635c1aae57cbb128da6
Patch
https://git.kernel.org/stable/c/063bd355595428750803d8736a9bb7c8db67d42d
Patch
https://git.kernel.org/stable/c/1a4017926eeea56c7540cc41b42106746ee8a0ee
Patch
https://git.kernel.org/stable/c/7c519f769f555ff7d9d4ccba3497bbb589df360a
Patch
https://git.kernel.org/stable/c/f3331bc17449f15832c31823f27573f4c0e13e5f
Patch