UBUNTU-CVE-2025-21726

Advisory lineage Upstream: 1 Downstream: 33
Upstream
CVE-2025-21726
Published: 27 Feb 2025, 02:15
Last modified:03 Jun 2026, 13:39

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

27 Feb 2025, 02:15
Published
Vulnerability first disclosed
03 Jun 2026, 13:39
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

Affected Systems

  • ubuntu•linux

    < 5.4.0-225.245 | < 5.15.0-140.150 | < 6.8.0-64.67

  • ubuntu•linux-allwinner-5.19

    all

  • ubuntu•linux-aws

    < 5.4.0-1154.164 | < 5.15.0-1084.91 | < 6.8.0-1032.34

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    all

  • ubuntu•linux-aws-5.13

    all

  • ubuntu•linux-aws-5.15

    < 5.15.0-1084.91~20.04.1

  • ubuntu•linux-aws-5.19

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1154.164~18.04.1

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-6.2

    all

  • ubuntu•linux-aws-6.5

    all

  • ubuntu•linux-aws-6.8

    < 6.8.0-1032.34~22.04.1

  • ubuntu•linux-aws-fips

    < 5.4.0-1154.164+fips1 | all | < 5.15.0-1084.91+fips1

  • ubuntu•linux-azure

    all | all | < 5.4.0-1157.164 | < 5.15.0-1089.98 | < 6.8.0-1034.39

  • ubuntu•linux-azure-5.11

    all

  • ubuntu•linux-azure-5.13

    all

  • ubuntu•linux-azure-5.15

    < 5.15.0-1089.98~20.04.1

  • ubuntu•linux-azure-5.19

    all

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    all | < 5.4.0-1157.164~18.04.1

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-6.11

    < 6.11.0-1015.15~24.04.1

  • ubuntu•linux-azure-6.2

    all

  • ubuntu•linux-azure-6.5

    all

  • ubuntu•linux-azure-6.8

    < 6.8.0-1034.39~22.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all | all

  • ubuntu•linux-azure-fde-5.19

    all

  • ubuntu•linux-azure-fde-6.2

    all

  • ubuntu•linux-azure-fips

    < 5.4.0-1158.165+fips1 | all | < 5.15.0-1089.98+fips1

  • ubuntu•linux-azure-nvidia

    < 6.8.0-1022.23

  • ubuntu•linux-bluefield

    < 5.15.0-1066.68 | all | < 5.4.0-1116.123 | < 5.15.0-1066.68 | all

  • ubuntu•linux-fips

    < 5.4.0-1128.138 | all | < 5.15.0-140.150+fips1 | < 6.8.0-78.78+fips1

  • ubuntu•linux-gcp

    all | < 5.4.0-1157.166 | < 5.15.0-1083.92 | < 6.8.0-1033.35

  • ubuntu•linux-gcp-5.11

    all

  • ubuntu•linux-gcp-5.13

    all

  • ubuntu•linux-gcp-5.15

    < 5.15.0-1083.92~20.04.1

  • ubuntu•linux-gcp-5.19

    all

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1157.166~18.04.1

  • ubuntu•linux-gcp-5.8

    all

  • ubuntu•linux-gcp-6.11

    < 6.11.0-1015.15~24.04.1

  • ubuntu•linux-gcp-6.2

    all

  • ubuntu•linux-gcp-6.5

    all

  • ubuntu•linux-gcp-6.8

    < 6.8.0-1033.35~22.04.1

  • ubuntu•linux-gcp-fips

    < 5.4.0-1157.166+fips1 | all | < 5.15.0-1083.92+fips1

  • ubuntu•linux-gke

    all | < 5.15.0-1081.87 | < 6.8.0-1028.32

  • ubuntu•linux-gke-4.15

    all

Showing first 50 affected entries in server-rendered view.

References (41)