CVE-2021-47356
Linux mISDN Use-After-Free Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: mISDN: fix possible use-after-free in HFC_cleanup() 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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 2, 2025, 2:54 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.2
Exploitability Score :
2.5
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-2021-47356.
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).
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The following list is the news that have been mention
CVE-2021-47356 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47356 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]
Apr. 02, 2025
Action Type Old Value New Value Added CPE Configuration OR *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) 5.4.133 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.51 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.18 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 4.4.276 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 up to (excluding) 5.13.3 Added Reference Type CVE: https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda Types: 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/009fc857c5f6fda81f2f7dd851b2d54193a8e733 Added Reference https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0 Added Reference https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe Added Reference https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7 Added Reference https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124 Added Reference https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020 Added Reference https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5 Added Reference https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d Added Reference https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 03, 2024
Action Type Old Value New Value Added CWE CISA-ADP CWE-416 Added CVSS V3.1 CISA-ADP AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H -
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: mISDN: fix possible use-after-free in HFC_cleanup() 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. Added Reference kernel.org https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7867ddc5f3de7f289aee63233afc0df4b62834c5 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733 [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-2021-47356 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-2021-47356
weaknesses.