Use After Free Affecting kernel-doc package, versions <0:4.18.0-553.8.1.el8_10
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDOC-6979979
- published 22 May 2024
- disclosed 21 May 2024
Introduced: 21 May 2024
CVE-2021-47356 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-doc to version 0:4.18.0-553.8.1.el8_10 or higher.
This issue was patched in RHSA-2024:4211.
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 RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
mISDN: fix possible use-after-free in HFC_cleanup()
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.
References
- https://access.redhat.com/security/cve/CVE-2021-47356
- https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733
- https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0
- https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe
- https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7
- https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124
- https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020
- https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5
- https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d
- https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda