CVE-2021-47461
published 2024-05-22CVE-2021-47461: 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…
PriorityP416medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
EPSS
0.17%
6.9th percentile
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.
Affected
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.14.16-1 (bookworm) | linux 5.14.16-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03 < 3cda4bfffd4f755645577aaa9e96a606657b4525 | 3cda4bfffd4f755645577aaa9e96a606657b4525 |
| linux | linux | >= 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03 < 149958ecd0627a9f1e9c678c25c665400054cd6a | 149958ecd0627a9f1e9c678c25c665400054cd6a |
| linux | linux | >= 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03 < cb185d5f1ebf900f4ae3bf84cee212e6dd035aca | cb185d5f1ebf900f4ae3bf84cee212e6dd035aca |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.84-1 | 5.10.84-1 |
| linux | linux_kernel | >= 0 < 5.14.16-1 | 5.14.16-1 |
| linux | linux_kernel | >= 0 < 5.14.16-1 | 5.14.16-1 |
| linux | linux_kernel | >= 0 < 5.14.16-1 | 5.14.16-1 |
| linux | linux_kernel | >= 5.11 < 5.14.15 | 5.14.15 |
| linux | linux_kernel | >= 5.7 < 5.10.76 | 5.10.76 |
CVSS provenance
nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv4.7MEDIUM
vendor_debian4.7MEDIUM
vendor_redhat4.7MEDIUM
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Red Hat
kernel: userfaultfd: fix a race between writeprotect and exit_mmap()
vendor_redhat·2024-05-22·CVSS 4.7
CVE-2021-47461 [MEDIUM] CWE-362 kernel: userfaultfd: fix a race between writeprotect and exit_mmap()
kernel: userfaultfd: fix a race between writeprotect and exit_mmap()
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.
A possible race condition flaw was found in the Linux kernel. When a process exits, its virtual memory areas (VMAs) are removed by exit_mmap(), and at the same time, userfaultfd_writeprotect() is called.
Package: kernel (Red Hat Enterprise Linux 6) - Out of support s
Debian
CVE-2021-47461: linux - In the Linux kernel, the following vulnerability has been resolved: userfaultfd...
vendor_debian·2021·CVSS 4.7
CVE-2021-47461 [MEDIUM] CVE-2021-47461: linux - In the Linux kernel, the following vulnerability has been resolved: userfaultfd...
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.
Scope: local
bookworm: resolved (fixed in 5.14.16-1)
bullseye: resolved (fixed in 5.10.84-1)
forky: resolved (fixed in 5.14.16-1)
sid: resolved (fixed in 5.14.16-1)
trixie: resolved (fixed in 5.14.16-1)
GHSA
GHSA-q3gr-2743-cwm5: In the Linux kernel, the following vulnerability has been resolved:
userfaultfd: fix a race between writeprotect and exit_mmap()
A race is possible
ghsa_unreviewed·2024-05-22
CVE-2021-47461 [MEDIUM] CWE-362 GHSA-q3gr-2743-cwm5: In the Linux kernel, the following vulnerability has been resolved:
userfaultfd: fix a race between writeprotect and exit_mmap()
A race is possible
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.
OSV
CVE-2021-47461: In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a race between writeprotect and exit_mmap() A race is possible wh
osv·2024-05-22·CVSS 4.7
CVE-2021-47461 [MEDIUM] CVE-2021-47461: In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a race between writeprotect and exit_mmap() A race is possible wh
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.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6ahttps://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035acahttps://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6ahttps://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035aca
2024-05-22
Published