Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.4.276 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3Patch
- https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1ePatch
- https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4dPatch
- https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4Patch
- https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270Patch
- https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79fPatch
- https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bfPatch
- https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111Patch
- https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707aPatch
- https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3Patch
- https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1ePatch
- https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4dPatch
- https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4Patch
- https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270Patch
- https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79fPatch
FAQ
What is CVE-2021-47321?
CVE-2021-47321 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 funct...
How severe is CVE-2021-47321?
CVE-2021-47321 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47321?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.