CVE-2025-21756

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.87% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 56.3% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-02-27 02:18Z1 YR AGO

Last updated

2026-08-05 11:54Z1 MO AGO

Reserved

2024-12-29

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

8d155e3275e3db73d921f268c1b2df0235bc1424b6886c8c909947ebcfe339b7

• git.kernel.orghttps://git.kernel.org/stable/c/e7754d564579a5db9c5c9f74228df5d6dd6f1173
• git.kernel.orghttps://git.kernel.org/stable/c/e48fcb403c2d0e574c19683f09399ab4cf67809c
• git.kernel.orghttps://git.kernel.org/stable/c/42b33381e5e1f2b967dc4fb4221ddb9aaf10d197
• git.kernel.orghttps://git.kernel.org/stable/c/3f43540166128951cc1be7ab1ce6b7f05c670d8b
• git.kernel.orghttps://git.kernel.org/stable/c/645ce25aa0e67895b11d89f27bb86c9d444c40f8
• git.kernel.orghttps://git.kernel.org/stable/c/b1afd40321f1c243cffbcf40ea7ca41aca87fa5e
• git.kernel.orghttps://git.kernel.org/stable/c/fcdd2242c0231032fc84e1404315c245ae56322a
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-265688.html
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html