8.8

CVE-2021-47323

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()

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

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()

This module's remove path calls del_timer(). However, that function
does not wait until the timer handler finishes. This means that the
timer handler may still be running after the driver's remove function
has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler
has finished, and unable to re-schedule itself.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 4.4.276
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.276
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.240
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.198
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.134
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.52
Linux ≫ Linux Kernel Version >= 5.11 < 5.12.19
Linux ≫ Linux Kernel Version >= 5.13 < 5.13.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.16% 0.63
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4
Patch
https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04
Patch
https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e
Patch
https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c
Patch
https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4
Patch
https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566
Patch
https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d
Patch
https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373
Patch
https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a
Patch