Answer in brief
CVE-2025-21726 records a High severity (CVSS 7.8) vulnerability in padata: avoid UAF for reorder_work. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=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 | f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0, 4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1, 7000507bb0d2ceb545c0a690e0c707c897d102c2, 6f45ef616775b0ce7889b0f6077fc8d681ab30bc, 8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac, a54091c24220a4cd847d5b4f36d678edacddbaf0, dd7d37ccf6b11f3d95e797ebe4e9e886d0332600, 5.5, 5.6 |
| Linux/Linuxgeneric | 5.6 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.