CVE-2021-47323
published 2024-05-21CVE-2021-47323: 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…
PriorityP349high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
1.16%
63.6th percentile
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.
Affected
25 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.14.6-1 (bookworm) | linux 5.14.6-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 | 0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b4565a8a2d6bffb05bfbec11399d261ec16fe373 | b4565a8a2d6bffb05bfbec11399d261ec16fe373 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2aef07017fae21c3d8acea9656b10e3b9c0f1e04 | 2aef07017fae21c3d8acea9656b10e3b9c0f1e04 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 522e75ed63f67e815d4ec0deace67df22d9ce78e | 522e75ed63f67e815d4ec0deace67df22d9ce78e |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7c56c5508dc20a6b133bc669fc34327a6711c24c | 7c56c5508dc20a6b133bc669fc34327a6711c24c |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 | a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d | b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f0feab82f6a0323f54d85e8b512a2be64f83648a | f0feab82f6a0323f54d85e8b512a2be64f83648a |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 90b7c141132244e8e49a34a4c1e445cce33e07f4 | 90b7c141132244e8e49a34a4c1e445cce33e07f4 |
| linux | linux_kernel | < 4.4.276 | 4.4.276 |
| linux | linux_kernel | >= 0 < 5.10.70-1 | 5.10.70-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 4.10 < 4.14.240 | 4.14.240 |
| linux | linux_kernel | >= 4.15 < 4.19.198 | 4.19.198 |
| linux | linux_kernel | >= 4.20 < 5.4.134 | 5.4.134 |
| linux | linux_kernel | >= 4.5 < 4.9.276 | 4.9.276 |
| linux | linux_kernel | >= 5.11 < 5.12.19 | 5.12.19 |
| linux | linux_kernel | >= 5.13 < 5.13.4 | 5.13.4 |
| linux | linux_kernel | >= 5.5 < 5.10.52 | 5.10.52 |
| msrc | azl3_kernel_6.6.82.1-1_on_azure_linux_3.0 | — | — |
| msrc | cbl2_kernel_5.15.176.3-3_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv8.8HIGH
vendor_debian8.8HIGH
vendor_msrc8.8HIGH
vendor_redhat8.8HIGH
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GHSA
GHSA-cm35-f8g3-r786: In the Linux kernel, the following vulnerability has been resolved:
watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
This module's
ghsa_unreviewed·2024-05-21
CVE-2021-47323 [HIGH] CWE-416 GHSA-cm35-f8g3-r786: In the Linux kernel, the following vulnerability has been resolved:
watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
This module's
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.
OSV
CVE-2021-47323: In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module's re
osv·2024-05-21·CVSS 8.8
CVE-2021-47323 [HIGH] CVE-2021-47323: In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module's re
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.
Red Hat
kernel: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
vendor_redhat·2024-05-21·CVSS 8.8
CVE-2021-47323 [HIGH] CWE-416 kernel: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
kernel: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
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.
A vulnerability was found in the wdt_turnoff() function in the Linux kernel's watchdog module. This issue arises when the module's remove process calls del_timer(), which does not wait for the timer handler to fini
Microsoft
watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
vendor_msrc·2024-05-14·CVSS 8.8
CVE-2021-47323 [HIGH] CWE-416 watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: htt
Debian
CVE-2021-47323: linux - In the Linux kernel, the following vulnerability has been resolved: watchdog: s...
vendor_debian·2021·CVSS 8.8
CVE-2021-47323 [HIGH] CVE-2021-47323: linux - In the Linux kernel, the following vulnerability has been resolved: watchdog: s...
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.
Scope: local
bookworm: resolved (fixed in 5.14.6-1)
bullseye: resolved (fixed in 5.10.70-1)
forky: resolved (fixed in 5.14.6-1)
sid: resolved (fixed in 5.14.6-1)
trixie: resolved (fixed in 5.14.6-1)
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78ehttps://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24chttps://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057dhttps://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648ahttps://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78ehttps://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24chttps://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057dhttps://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a
2024-05-21
Published