CVE-2025-38584 (GCVE-0-2025-38584)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2026-10-15 22:02
VLAI
Title
padata: Fix pd UAF once and for all
Summary
In 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.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:51 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6638 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < a2048e475e22b13dc3e53d485b7e6e11464ed9a6 (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < 73f132e60857038416540c3599b1de6033d7575a (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < 609e59193fc6d9dd323f1c6ae1fdd721f1c79680 (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < a11a12a9880ab37342b73c93cfe1a3ada02ff0db (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < f231d5d001ec75f5886c02d496a4c79edc383d45 (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < dbe3e911a59bda6de96e7cae387ff882c2c177fa (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < cdf79bd2e1ecb3cc75631c73d8f4149be6019a52 (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < 71203f68c7749609d7fc8ae6ad054bdedeb24f91 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npadata: Fix pd UAF once and for all\n\nThere is a race condition/UAF in padata_reorder that goes back\nto the initial commit.  A reference count is taken at the start\nof the process in padata_do_parallel, and released at the end in\npadata_serial_worker.\n\nThis reference count is (and only is) required for padata_replace\nto function correctly.  If padata_replace is never called then\nthere is no issue.\n\nIn the function padata_reorder which serves as the core of padata,\nas soon as padata is added to queue-\u003eserial.list, and the associated\nspin lock released, that padata may be processed and the reference\ncount on pd would go away.\n\nFix this by getting the next padata before the squeue-\u003eserial lock\nis released.\n\nIn order to make this possible, simplify padata_reorder by only\ncalling it once the next padata arrives."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: padata: Arregla pd UAF de una vez por todas Hay una condici\u00f3n de ejecuci\u00f3n/UAF en padata_reorder que se remonta a la confirmaci\u00f3n inicial. Se toma un recuento de referencias al inicio del proceso en padata_do_parallel y se libera al final en padata_serial_worker. Este recuento de referencias es (y solo es) necesario para que padata_replace funcione correctamente. Si nunca se llama a padata_replace, no hay problema. En la funci\u00f3n padata_reorder que sirve como n\u00facleo de padata, tan pronto como padata se agrega a queue-\u0026gt;serial.list y se libera el bloqueo de giro asociado, ese padata puede procesarse y el recuento de referencias en pd desaparecer\u00eda. Arregla esto obteniendo el siguiente padata antes de que se libere el bloqueo squeue-\u0026gt;serial. Para que esto sea posible, simplifica padata_reorder llam\u00e1ndolo solo una vez que llega el siguiente padata."
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