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

Vulnerability from cvelistv5 – Published: 2024-04-03 14:55 – Updated: 2026-05-11 20:02
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
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
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)
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This commit doesn\u0027t\\nremove the tasklet support, because the tasklet code will be reused when\\natomic workqueues will be implemented.\\n\\n[1] https://lore.kernel.org/all/d390d7ee-f142-44d3-822a-87949e14608b@suse.de/T/\\n[2] https://lore.kernel.org/lkml/20240130091300.2968534-1-tj@kernel.org/\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm-crypt, dm-verity: deshabilitar tasklets Los tasklets tienen un problema inherente con la corrupci\u00f3n de la memoria. La funci\u00f3n tasklet_action_common llama a tasklet_trylock, luego llama a la devoluci\u00f3n de llamada del tasklet y luego llama a tasklet_unlock. Si la devoluci\u00f3n de llamada del tasklet libera la estructura que contiene el tasklet o si llama a alg\u00fan c\u00f3digo que pueda liberarlo, tasklet_unlock escribir\u00e1 en la memoria libre. Las confirmaciones 8e14f610159d y d9a02e016aaf intentan solucionarlo para dm-crypt, pero no es una soluci\u00f3n suficiente y la corrupci\u00f3n de datos a\u00fan puede ocurrir [1]. No hay ninguna soluci\u00f3n para dm-verity y dm-verity escribir\u00e1 en la memoria libre con cada biograf\u00eda procesada por tasklet. Habr\u00e1 colas de trabajo at\u00f3micas implementadas en el kernel 6.9 [2]. Tendr\u00e1n una mejor interfaz y no sufrir\u00e1n el problema de corrupci\u00f3n de memoria. Pero necesitamos algo que detenga la corrupci\u00f3n de la memoria ahora y que pueda ser compatible con los n\u00facleos estables. Entonces, propongo esta confirmaci\u00f3n que deshabilita los tasklets tanto en dm-crypt como en dm-verity. Esta confirmaci\u00f3n no elimina la compatibilidad con el tasklet, porque el c\u00f3digo del tasklet se reutilizar\u00e1 cuando se implementen las colas de trabajo at\u00f3micas. [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/\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.9\",\"versionEndExcluding\":\"6.1.79\",\"matchCriteriaId\":\"9306FADC-BB71-4E0E-81A3-662E21C9A9F1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.18\",\"matchCriteriaId\":\"BD961E49-FEDA-47CF-BF23-4D2BD942B4E0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.6\",\"matchCriteriaId\":\"C6D6A5C8-7308-42A9-8A72-ABF3DEA4BB82\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B9F4EA73-0894-400F-A490-3A397AB7A517\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"056BD938-0A27-4569-B391-30578B309EE3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b825e0f9d68c178072bffd32dd34c39e3d2d597a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0a9bab391e336489169b95cb0d4553d921302189\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0c45a20cbe68bc4d681734f5c03891124a274257\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/30884a44e0cedc3dfda8c22432f3ba4078ec2d94\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5735a2671ffb70ea29ca83969fe01316ee2ed6fc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
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      "dataType": "CVE_RECORD",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.