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Date: Wed, 3 Apr 2024 16:56:09 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-26718: dm-crypt, dm-verity: disable tasklets 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/ The Linux kernel CVE team has assigned CVE-2024-26718 to this issue. Affected and fixed versions =========================== Issue introduced in 5.9 with commit 39d42fa96ba1 and fixed in 6.1.79 with commit 30884a44e0ce Issue introduced in 5.9 with commit 39d42fa96ba1 and fixed in 6.6.18 with commit 5735a2671ffb Issue introduced in 5.9 with commit 39d42fa96ba1 and fixed in 6.7.6 with commit 0c45a20cbe68 Issue introduced in 5.9 with commit 39d42fa96ba1 and fixed in 6.8 with commit 0a9bab391e33 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-26718 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/md/dm-crypt.c drivers/md/dm-verity-target.c drivers/md/dm-verity.h Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: 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
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