PT-2024-11320 · Linux+6 · Linux Kernel+6
Hulk Robot
·
Published
2021-06-21
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Updated
2024-12-26
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CVE-2021-47321
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue is related to a possible use-after-free in the Linux kernel's watchdog driver. The driver's remove path calls
del timer(), which does not wait until the timer handler finishes, potentially resulting in a use-after-free. This can be fixed by calling del timer sync(), ensuring the timer handler has finished and cannot re-schedule itself.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Almalinux
Astra Linux
Centos
Linux Kernel
Red Hat
Rocky Linux
Suse