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

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2025-09-29 05:54
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < dbe3e911a59bda6de96e7cae387ff882c2c177fa (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < cdf79bd2e1ecb3cc75631c73d8f4149be6019a52 (git)
Affected: 16295bec6398a3eedc9377e1af6ff4c71b98c300 , < 71203f68c7749609d7fc8ae6ad054bdedeb24f91 (git)
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    Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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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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    "dateReserved": "2025-04-16T04:51:24.026Z",
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