module/dups: Fix use-after-free in kmod_dup_req lifetime handling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90291
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:26 UTC
Updated2026-10-21 13:20:47 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: module/dups: Fix use-after-free in kmod_dup_req lifetime handling The kmod dups code uses RCU to ensure that a kmod_dup_req instance is freed only after it is no longer referenced. When releasing an instance, the kmod_dup_request_delete() function removes the kmod_dup_req from the dup_kmod_reqs list, waits via synchronize_rcu() and finally frees it. However, this doesn't work correctly because parallel users referencing the instance in kmod_dup_request_exists_wait() don't enter an RCU read-side critical section. This can result in a use-after-free. The kmod_dup_request_exists_wait() function may need to hold a valid reference to a kmod_dup_req instance across a blocking wait until the corresponding modprobe command completes. This makes it unsuitable for RCU. Fix the issue by changing the lifecycle management of kmod_dup_req to use reference counting.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001590000 probability, percentile 0.054330000 (date 2026-09-21)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8660484ed1cf3261e89e0bad94c6395597e87599 a3205bd1f218053575589b14caf8df667f344134 git Not specified
CNA Linux Linux affected 8660484ed1cf3261e89e0bad94c6395597e87599 2c85e0fb528e039aa8ea1e9c2a1f64347f990541 git Not specified
CNA Linux Linux affected 8660484ed1cf3261e89e0bad94c6395597e87599 b2709aad7599f6fd957939b60f4a8323c8f08072 git Not specified
CNA Linux Linux affected 8660484ed1cf3261e89e0bad94c6395597e87599 cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca git Not specified
CNA Linux Linux affected 8660484ed1cf3261e89e0bad94c6395597e87599 5eecb11b543f9f417bcf0dea239ff99c6af65dbd git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b2709aad7599f6fd957939b60f4a8323c8f08072 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c85e0fb528e039aa8ea1e9c2a1f64347f990541 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5eecb11b543f9f417bcf0dea239ff99c6af65dbd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a3205bd1f218053575589b14caf8df667f344134 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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