Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2025-21726

padata: avoid UAF for reorder_work

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.5, 5.6, 5.10.235, 5.15.179, 6.1.129, and 3 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: avoid UAF for reorder_work Although the previous patch can avoid ps and ps UAF for _do_serial, it can not avoid potential UAF issue for reorder_work. This issue can happen just as below: crypto_request crypto_request crypto_del_alg padata_do_serial ... padata_reorder // processes all remaining // requests then breaks while (1) { if (!padata) break; ... } padata_do_serial // new request added list_add // sees the new request queue_work(reorder_work) padata_reorder queue_work_on(squeue->work) ... <kworker context> padata_serial_worker // completes new request, // no more outstanding // requests crypto_del_alg // free pd <kworker context> invoke_padata_reorder // UAF of pd To avoid UAF for 'reorder_work', get 'pd' ref before put 'reorder_work' into the 'serial_wq' and put 'pd' ref until the 'serial_wq' finish.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From bbefa1dd6a6d53537c11624752219e39959d04fb · fixed in f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0; From bbefa1dd6a6d53537c11624752219e39959d04fb · fixed in 4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1; From bbefa1dd6a6d53537c11624752219e39959d04fb · fixed in 7000507bb0d2ceb545c0a690e0c707c897d102c2; From bbefa1dd6a6d53537c11624752219e39959d04fb · fixed in 6f45ef616775b0ce7889b0f6077fc8d681ab30bc; From bbefa1dd6a6d53537c11624752219e39959d04fb · fixed in 8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac; From bbefa1dd6a6d53537c11624752219e39959d04fb · fixed in a54091c24220a4cd847d5b4f36d678edacddbaf0; From bbefa1dd6a6d53537c11624752219e39959d04fb · fixed in dd7d37ccf6b11f3d95e797ebe4e9e886d0332600; From 5.4.19 · fixed in 5.5; From 5.5.3 · fixed in 5.6

  • Linux Linux

    5.6

  • KernelLinux

    From 5.6.0 · fixed in 5.10.235; From 5.11.0 · fixed in 5.15.179; From 5.16.0 · fixed in 6.1.129; From 6.2.0 · fixed in 6.6.76; From 6.7.0 · fixed in 6.12.13; From 6.13.0 · fixed in 6.13.2

References 7

git.kernel.org