CVE-2025-21855

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• 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

0.42% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 34.9% 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 2026-07-30.

Red Hat severity

Moderate. 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

2025-03-12 09:42Z1 YR AGO

Last updated

2026-08-05 11:54Z1 MO AGO

Reserved

2024-12-29

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

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

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

e48d7e04752f782219b077219a026c9c2a0bc1824c549bd074924d67abd6f59a

• git.kernel.orghttps://git.kernel.org/stable/c/501ac6a7e21b82e05207c6b4449812d82820f306
• git.kernel.orghttps://git.kernel.org/stable/c/093b0e5c90592773863f300b908b741622eef597
• git.kernel.orghttps://git.kernel.org/stable/c/25dddd01dcc8ef3acff964dbb32eeb0d89f098e9
• git.kernel.orghttps://git.kernel.org/stable/c/abaff2717470e4b5b7c0c3a90e128b211a23da09
• git.kernel.orghttps://git.kernel.org/stable/c/bdf5d13aa05ec314d4385b31ac974d6c7e0997c9
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/05/msg00045.html