CVE-2025-21726

Advisory lineage Upstream: 0 Downstream: 54
Modified
Published: 27 Feb 2025, 02:07
Last modified:23 May 2026, 15:57

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.03% LOW
0% probability -0.02%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

27 Feb 2025, 02:07
Published
Vulnerability first disclosed
23 May 2026, 15:57
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.03%• Percentile: 9%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • linux•linux

    ≥ bbefa1dd6a6d53537c11624752219e39959d04fb, < f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0 | ≥ bbefa1dd6a6d53537c11624752219e39959d04fb, < 4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1 | ≥ bbefa1dd6a6d53537c11624752219e39959d04fb, < 7000507bb0d2ceb545c0a690e0c707c897d102c2 | ≥ bbefa1dd6a6d53537c11624752219e39959d04fb, < 6f45ef616775b0ce7889b0f6077fc8d681ab30bc | ≥ bbefa1dd6a6d53537c11624752219e39959d04fb, < 8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac | ≥ bbefa1dd6a6d53537c11624752219e39959d04fb, < a54091c24220a4cd847d5b4f36d678edacddbaf0 | ≥ bbefa1dd6a6d53537c11624752219e39959d04fb, < dd7d37ccf6b11f3d95e797ebe4e9e886d0332600 | b4c8ed0bf977760a206997b6429a7ac91978f440 | e43d65719527043f1ef79ecba9d4ede58cbc7ffe | ≥ 5.4.19, < 5.5 | ≥ 5.5.3, < 5.6 | 5.6

  • linux•linux_kernel

    ≥ 5.4.19, < 5.5 | ≥ 5.5.3, < 5.10.235 | ≥ 5.11, < 5.15.79 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.76 | ≥ 6.7, < 6.12.13 | ≥ 6.13, < 6.13.2

References (10)