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Linux KernelOperating system · Linux

CVE-2024-26718

MEDIUM · 5.5 CVSS v3.1 Published 2024-04-03
Fix available
A fix is available. Upgrade to 6.1.79 / 6.6.18 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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]/

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-787

The program writes past the bounds of a buffer, overwriting adjacent memory an attacker can turn to their advantage. Crafted input can overwrite control data and redirect execution. Remediation is validating every index and length before a write, plus modern memory-safety mitigations.

General guidance for the out-of-bounds write class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 5.9, < 6.1.79>= 6.2, < 6.6.18>= 6.7, < 6.7.6= 6.8

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.1.79 / 6.6.18 / 6.7.6 or later
Fixed in 6.1.796.6.186.7.6
Vendor patch git.kernel.org →
Recommended fix High confidence

6.1.79+ (for 6.1.x), 6.6.18+ (for 6.2-6.6.x), 6.7.6+ (for 6.7.x), or 6.8.1+ (for 6.8.x)

  1. Identify the currently running Linux kernel version using 'uname -r'
  2. Determine which version range your current kernel falls into based on the affected versions: >= 5.9 to < 6.1.79, >= 6.2 to < 6.6.18, >= 6.7 to < 6.7.6, or exactly 6.8
  3. Upgrade the Linux kernel to a fixed version: for 6.1.x line upgrade to >= 6.1.79, for 6.2-6.6.x upgrade to >= 6.6.18, for 6.7.x upgrade to >= 6.7.6, for 6.8.x upgrade to >= 6.8.1
  4. After kernel upgrade, reboot the system to load the patched kernel
  5. Verify the fix is applied by checking the kernel version matches a fixed release and reviewing the commit 0a9bab391e336489169b95cb0d4553d921302189 is included
Caveat Kernel upgrades may require rebuild of out-of-tree modules and could introduce regressions in drivers; ensure compatibility with system hardware before production deployment

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $2,850. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-26718 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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