Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.4.276 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4Patch
- https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04Patch
- https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78ePatch
- https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24cPatch
- https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4Patch
- https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566Patch
- https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057dPatch
- https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373Patch
- https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648aPatch
- https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4Patch
- https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04Patch
- https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78ePatch
- https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24cPatch
- https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4Patch
- https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566Patch
FAQ
What is CVE-2021-47323?
CVE-2021-47323 is a vulnerability with a CVSS score of 8.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module's remove path calls del_timer(). However, that funct...
How severe is CVE-2021-47323?
CVE-2021-47323 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47323?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.