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PUBLISHED

CVE-2024-26718

dm-crypt, dm-verity: disable tasklets

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-04

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/d390d7ee-f142-44d3-822a-87949e14608b@suse.de/T/ [2] https://lore.kernel.org/lkml/20240130091300.2968534-1-tj@kernel.org/

Product status

Default status
unaffected

39d42fa96ba1 before 30884a44e0ce
affected

39d42fa96ba1 before 5735a2671ffb
affected

39d42fa96ba1 before 0c45a20cbe68
affected

39d42fa96ba1 before 0a9bab391e33
affected

Default status
affected

5.9
affected

Any version before 5.9
unaffected

6.1.79
unaffected

6.6.18
unaffected

6.7.6
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94

https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc

https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257

https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189

cve.org CVE-2024-26718

nvd.nist.gov CVE-2024-26718

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