CVE-2024-26718
Linux Kernel dm-crypt, dm-verity Tasklet Disable Vuln
Description
In the Linux kernel, the following vulnerability has been resolved: dm-crypt, dm-verity: disable tasklets Tasklets have an inherent problem with memory corruption. The function tasklet_action_common calls tasklet_trylock, then it calls the tasklet callback and then it calls tasklet_unlock. If the tasklet callback frees the structure that contains the tasklet or if it calls some code that may free it, tasklet_unlock will write into free memory. The commits 8e14f610159d and d9a02e016aaf try to fix it for dm-crypt, but it is not a sufficient fix and the data corruption can still happen [1]. There is no fix for dm-verity and dm-verity will write into free memory with every tasklet-processed bio. There will be atomic workqueues implemented in the kernel 6.9 [2]. They will have better interface and they will not suffer from the memory corruption problem. But we need something that stops the memory corruption now and that can be backported to the stable kernels. So, I'm proposing this commit that disables tasklets in both dm-crypt and dm-verity. This commit doesn't remove the tasklet support, because the tasklet code will be reused when atomic workqueues will be implemented. [1] https://lore.kernel.org/all/[email protected]/T/ [2] https://lore.kernel.org/lkml/[email protected]/
INFO
Published Date :
April 3, 2024, 3:15 p.m.
Last Modified :
March 17, 2025, 4:01 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel package.
- Reboot the system after the update.
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-2024-26718.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-26718 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-2024-26718
weaknesses.
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-2024-26718 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-26718 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.
-
Initial Analysis by [email protected]
Mar. 17, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-787 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.7.6 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.18 *cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.9 up to (excluding) 6.1.79 Added Reference Type CVE: https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b825e0f9d68c178072bffd32dd34c39e3d2d597a 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/0a9bab391e336489169b95cb0d4553d921302189 Added Reference https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257 Added Reference https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94 Added Reference https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 22, 2024
Action Type Old Value New Value Added Reference kernel.org https://git.kernel.org/stable/c/b825e0f9d68c178072bffd32dd34c39e3d2d597a [No types assigned] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 29, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 03, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: dm-crypt, dm-verity: disable tasklets Tasklets have an inherent problem with memory corruption. The function tasklet_action_common calls tasklet_trylock, then it calls the tasklet callback and then it calls tasklet_unlock. If the tasklet callback frees the structure that contains the tasklet or if it calls some code that may free it, tasklet_unlock will write into free memory. The commits 8e14f610159d and d9a02e016aaf try to fix it for dm-crypt, but it is not a sufficient fix and the data corruption can still happen [1]. There is no fix for dm-verity and dm-verity will write into free memory with every tasklet-processed bio. There will be atomic workqueues implemented in the kernel 6.9 [2]. They will have better interface and they will not suffer from the memory corruption problem. But we need something that stops the memory corruption now and that can be backported to the stable kernels. So, I'm proposing this commit that disables tasklets in both dm-crypt and dm-verity. This commit doesn't remove the tasklet support, because the tasklet code will be reused when atomic workqueues will be implemented. [1] https://lore.kernel.org/all/[email protected]/T/ [2] https://lore.kernel.org/lkml/[email protected]/ Added Reference kernel.org https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189 [No types assigned]