CVE-2021-47321
Published: May 21, 2024
Modified: May 11, 2026
Description
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.
| Vendor | Product | Versions |
|---|---|---|
Linux | Linux | affected 7c25f8c9f67708e6464d2221bc311cbd99e950dc - < 58606882ad8ec6c39e0f40344b922921ef94ab4daffected 7c25f8c9f67708e6464d2221bc311cbd99e950dc - < ca96b8ea5e74956071154bdb456778cc3027e79faffected 7c25f8c9f67708e6464d2221bc311cbd99e950dc - < 8bec568d7518b1504a602ed5376bb322e4dbb270affected 7c25f8c9f67708e6464d2221bc311cbd99e950dc - < ecd620e0fb1ff7f78fdb593379b2e6938c99707aaffected 7c25f8c9f67708e6464d2221bc311cbd99e950dc - < db222f1477ad5692cd454709b714949807e5d111+4 more versions |
Linux | Linux | affected 4.3unaffected 0 - < 4.3unaffected 4.4.276 - <= 4.4.*unaffected 4.9.276 - <= 4.9.*unaffected 4.14.240 - <= 4.14.*+6 more versions |
References
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