CVE-2024-26718 (GCVE-0-2024-26718)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:55 – Updated: 2026-08-05 11:26
VLAI
Title
dm-crypt, dm-verity: disable tasklets
Summary
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/
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:52 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 , < b825e0f9d68c178072bffd32dd34c39e3d2d597a (git)
Affected: 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 , < 30884a44e0cedc3dfda8c22432f3ba4078ec2d94 (git)
Affected: 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 , < 5735a2671ffb70ea29ca83969fe01316ee2ed6fc (git)
Affected: 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 , < 0c45a20cbe68bc4d681734f5c03891124a274257 (git)
Affected: 39d42fa96ba1b7d2544db3f8ed5da8fb0d5cb877 , < 0a9bab391e336489169b95cb0d4553d921302189 (git)
Create a notification for this product.
Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.15.169 , ≤ 5.15.* (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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                  "value": "AV:L - The write-after-free is reached only through local block I/O against an existing dm-verity or dm-crypt device \u2014 a read()/write() or O_DIRECT access to a file or the device node \u2014 with no network or adjacent-network path to the vulnerable component.\nAC:L - For dm-verity the corruption is fully deterministic: `verity_tasklet()` frees the object via `bio_endio()`\u2192`clone_endio()`\u2192`free_io()` and `tasklet_unlock()` then writes into it on *every* tasklet-processed bio, with no race to win and no memory-layout precondition; the attacker simply issues reads, and the enabling table options (`try_verify_in_tasklet`, `no_read_workqueue`, and the automatic `no_write_workqueue` on zoned/SMR devices) are widely deployed on Android, ChromeOS and cryptsetup-tuned systems.\nPR:L - An ordinary unprivileged local user or Android app triggers the bug just by reading a file that lives on the dm-verity/dm-crypt device; the CAP_SYS_ADMIN check in `dm_ctl_ioctl()` gates only device creation, which is a normal administrator/vendor deployment step rather than something the attacker must perform.\nUI:N - The attacker generates the triggering I/O directly with ordinary read/write syscalls (or O_DIRECT / fadvise DONTNEED to force real bios); no victim action, mount, or file-open by another user is needed.\nS:U - The freed object, the stray `clear_bit()`/`wake_up_var()` write, and all resulting corruption stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free on a slab object that is immediately recyclable from the bio mempool, so an attacker who grooms a chosen victim structure into the freed slot can flip a bit in a length, index, flags or pointer field and convert it into a kernel memory disclosure primitive.\nI:H - `tasklet_unlock()` performs an attacker-repeatable `clear_bit(TASKLET_STATE_RUN, \u0026t-\u003estate)` at a fixed, known offset inside memory that has already been returned to the bio slab, giving a targeted heap write into a sprayed victim object \u2014 the commit itself describes the result as \"memory corruption\"/\"data corruption,\" which is exploitable toward control-flow hijack and privilege escalation.\nA:H - Writing into a freed and reallocated bio/dm_io allocation corrupts live block-layer state, producing kernel oopses, panics and silent data corruption on every tasklet-processed bio, and the attacker can drive it continuously by sustaining I/O."
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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.