padata: Fix pd UAF once and for all

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Summary

CVECVE-2025-38584
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-08-19 17:15:35 UTC
Updated2026-06-01 17:16:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: padata: Fix pd UAF once and for all There is a race condition/UAF in padata_reorder that goes back to the initial commit. A reference count is taken at the start of the process in padata_do_parallel, and released at the end in padata_serial_worker. This reference count is (and only is) required for padata_replace to function correctly. If padata_replace is never called then there is no issue. In the function padata_reorder which serves as the core of padata, as soon as padata is added to queue->serial.list, and the associated spin lock released, that padata may be processed and the reference count on pd would go away. Fix this by getting the next padata before the squeue->serial lock is released. In order to make this possible, simplify padata_reorder by only calling it once the next padata arrives.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-416

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 a2048e475e22b13dc3e53d485b7e6e11464ed9a6 git Not specified
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 73f132e60857038416540c3599b1de6033d7575a git Not specified
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 609e59193fc6d9dd323f1c6ae1fdd721f1c79680 git Not specified
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 a11a12a9880ab37342b73c93cfe1a3ada02ff0db git Not specified
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 f231d5d001ec75f5886c02d496a4c79edc383d45 git Not specified
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 dbe3e911a59bda6de96e7cae387ff882c2c177fa git Not specified
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 cdf79bd2e1ecb3cc75631c73d8f4149be6019a52 git Not specified
CNA Linux Linux affected 16295bec6398a3eedc9377e1af6ff4c71b98c300 71203f68c7749609d7fc8ae6ad054bdedeb24f91 git Not specified
CNA Linux Linux affected 2.6.34 Not specified
CNA Linux Linux unaffected 2.6.34 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.10 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.1 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a2048e475e22b13dc3e53d485b7e6e11464ed9a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/609e59193fc6d9dd323f1c6ae1fdd721f1c79680 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/71203f68c7749609d7fc8ae6ad054bdedeb24f91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f231d5d001ec75f5886c02d496a4c79edc383d45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dbe3e911a59bda6de96e7cae387ff882c2c177fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cdf79bd2e1ecb3cc75631c73d8f4149be6019a52 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/73f132e60857038416540c3599b1de6033d7575a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a11a12a9880ab37342b73c93cfe1a3ada02ff0db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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