CVE-2021-47321
Apache Linux Kernel Timer Handler Use-After-Free 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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
Dec. 26, 2024, 7:51 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47321.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47321 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47321 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Dec. 26, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE NIST CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 4.4.276 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.276 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.240 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.198 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.134 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.52 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.9 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 up to (excluding) 5.13.4 Changed Reference Type https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 No Types Assigned https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 Patch Changed Reference Type https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 No Types Assigned https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 Patch Changed Reference Type https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e No Types Assigned https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e Patch Changed Reference Type https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e No Types Assigned https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e Patch Changed Reference Type https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d No Types Assigned https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d Patch Changed Reference Type https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d No Types Assigned https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d Patch Changed Reference Type https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 No Types Assigned https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 Patch Changed Reference Type https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 No Types Assigned https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 Patch Changed Reference Type https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 No Types Assigned https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 Patch Changed Reference Type https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 No Types Assigned https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 Patch Changed Reference Type https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f No Types Assigned https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f Patch Changed Reference Type https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f No Types Assigned https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f Patch Changed Reference Type https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf No Types Assigned https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf Patch Changed Reference Type https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf No Types Assigned https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf Patch Changed Reference Type https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 No Types Assigned https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 Patch Changed Reference Type https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 No Types Assigned https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 Patch Changed Reference Type https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a No Types Assigned https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a Patch Changed Reference Type https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a No Types Assigned https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 Added Reference https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e Added Reference https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d Added Reference https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 Added Reference https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 Added Reference https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f Added Reference https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf Added Reference https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 Added Reference https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47321 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47321
weaknesses.