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CVE-2025-38584

padata: Fix pd UAF once and for all

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in a2048e475e22b13dc3e53d485b7e6e11464ed9a6; From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in 73f132e60857038416540c3599b1de6033d7575a; From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in 609e59193fc6d9dd323f1c6ae1fdd721f1c79680; From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in a11a12a9880ab37342b73c93cfe1a3ada02ff0db; From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in f231d5d001ec75f5886c02d496a4c79edc383d45; From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in dbe3e911a59bda6de96e7cae387ff882c2c177fa; From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in cdf79bd2e1ecb3cc75631c73d8f4149be6019a52; From 16295bec6398a3eedc9377e1af6ff4c71b98c300 · fixed in 71203f68c7749609d7fc8ae6ad054bdedeb24f91

  • Linux Linux

    2.6.34

  • KernelLinux

    From 2.6.34 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.140; From 6.7.0 · fixed in 6.12.86; From 6.13.0 · fixed in 6.15.10; From 6.16.0 · fixed in 6.16.1

References 8

git.kernel.org