CVE-2025-21726

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Source
https://cve.org/CVERecord?id=CVE-2025-21726
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21726.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21726
Downstream
Related
Published
2025-02-27T02:07:32.861Z
Modified
2026-03-20T12:41:08.847129Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
padata: avoid UAF for reorder_work
Details

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 doserial, it can not avoid potential UAF issue for reorder_work. This issue can happen just as below:

cryptorequest cryptorequest cryptodelalg padatadoserial ... 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> invokepadatareorder // UAF of pd

To avoid UAF for 'reorderwork', get 'pd' ref before put 'reorderwork' into the 'serialwq' and put 'pd' ref until the 'serialwq' finish.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21726.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
bbefa1dd6a6d53537c11624752219e39959d04fb
Fixed
f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0
Fixed
4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1
Fixed
7000507bb0d2ceb545c0a690e0c707c897d102c2
Fixed
6f45ef616775b0ce7889b0f6077fc8d681ab30bc
Fixed
8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac
Fixed
a54091c24220a4cd847d5b4f36d678edacddbaf0
Fixed
dd7d37ccf6b11f3d95e797ebe4e9e886d0332600
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
b4c8ed0bf977760a206997b6429a7ac91978f440
Last affected
e43d65719527043f1ef79ecba9d4ede58cbc7ffe

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21726.json"