Use After Free Affecting kernel-doc package, versions <0:4.18.0-553.22.1.el8_10
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELDOC-6999655
- published 28 May 2024
- disclosed 21 May 2024
Introduced: 21 May 2024
CVE-2021-47321 Open this link in a new tabHow to fix?
Upgrade Centos:8 kernel-doc to version 0:4.18.0-553.22.1.el8_10 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2021-47321
- https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3
- https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e
- https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d
- https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4
- https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270
- https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f
- https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf
- https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111
- https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a