7.8

CVE-2021-47321

watchdog: Fix possible use-after-free by calling del_timer_sync()

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

watchdog: Fix possible use-after-free by calling del_timer_sync()

This driver'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 < 5.12.9
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 0.25% 0.157
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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/1a053c4d716898a53c2e31c574a70ea0c37044a3
Patch
https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e
Patch
https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d
Patch
https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4
Patch
https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270
Patch
https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f
Patch
https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf
Patch
https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111
Patch
https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a
Patch