CVE-2021-47461
Published: May 22, 2024
Modified: May 11, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a race between writeprotect and exit_mmap() A race is possible when a process exits, its VMAs are removed by exit_mmap() and at the same time userfaultfd_writeprotect() is called. The race was detected by KASAN on a development kernel, but it appears to be possible on vanilla kernels as well. Use mmget_not_zero() to prevent the race as done in other userfaultfd operations.
| Vendor | Product | Versions |
|---|---|---|
Linux | Linux | affected 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03 - < 3cda4bfffd4f755645577aaa9e96a606657b4525affected 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03 - < 149958ecd0627a9f1e9c678c25c665400054cd6aaffected 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03 - < cb185d5f1ebf900f4ae3bf84cee212e6dd035aca |
Linux | Linux | affected 5.7unaffected 0 - < 5.7unaffected 5.10.76 - <= 5.10.*unaffected 5.14.15 - <= 5.14.*unaffected 5.15 - <= * |
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