CVE-2025-21991

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

0.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 12.6% 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

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

2025-04-02 12:53Z1 YR AGO

Last updated

2026-05-23 15:57Z3 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-129Improper Validation of Array IndexVariant
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

46e2be9c57ac60a6e79457eabc140e015c6bc66c6de4fa847fbd13b8b1f13f76

• git.kernel.orghttps://git.kernel.org/stable/c/d509c4731090ebd9bbdb72c70a2d70003ae81f4f
• git.kernel.orghttps://git.kernel.org/stable/c/985a536e04bbfffb1770df43c6470f635a6b1073
• git.kernel.orghttps://git.kernel.org/stable/c/18b5d857c6496b78ead2fd10001b81ae32d30cac
• git.kernel.orghttps://git.kernel.org/stable/c/ec52240622c4d218d0240079b7c1d3ec2328a9f4
• git.kernel.orghttps://git.kernel.org/stable/c/e686349cc19e800dac8971929089ba5ff59abfb0
• git.kernel.orghttps://git.kernel.org/stable/c/488ffc0cac38f203979f83634236ee53251ce593
• git.kernel.orghttps://git.kernel.org/stable/c/5ac295dfccb5b015493f86694fa13a0dde4d3665
• git.kernel.orghttps://git.kernel.org/stable/c/e3e89178a9f4a80092578af3ff3c8478f9187d59
• 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