7.8

CVE-2025-26596: redhat enterprise_linux Out-of-bounds Write

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-26596DEBIAN-CVE-2025-26596
Published 25-02-2025Last modified 29-06-2026
Open JSON

Vulnerability summary

CVE-2025-26596 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in redhat enterprise_linux. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.6% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.44%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 29 · Related 12
DLA-4072-1DSA-5872-1MGASA-2025-0086OPENSUSE-SU-2025:14841-1OPENSUSE-SU-2025:14842-1RHSA-2025:2500

Timeline

  1. 25-02-2025
    PublishedVulnerability first disclosed.
  2. 29-06-2026
    Last modifiedVulnerability information updated.

Description

A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

+0.01 pp

From 0.43% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.44%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu4 products
  • xorg-serverAll versions (No fix recorded) | < 2:1.18.4-0ubuntu0.12+esm17 | < 2:1.19.6-1ubuntu4.15+esm12 | < 2:1.20.13-1ubuntu1~20.04.19 | < 2:21.1.4-2ubuntu1.7~22.04.13 | < 2:21.1.12-1ubuntu1.2 | < 2:21.1.16-1ubuntu1
  • xorg-server-hwe-16.04< 2:1.19.6-1ubuntu4.1~16.04.6+esm9
  • xorg-server-hwe-18.04< 2:1.20.8-2ubuntu2.2~18.04.11+esm4
  • xwayland< 2:22.1.1-1ubuntu0.17 | < 2:23.2.6-1ubuntu0.4
Debian2 products
  • xorg-server< 2:21.1.7-3+deb12u9 | < 2:21.1.16-1
  • xwaylandAll versions (No fix recorded) | < 2:24.1.6-1
X.org2 products
Redhat1 product
Tigervnc1 product

5 vendors · 10 products

References

26 links
Show all 26 references