7.8

CVE-2025-26599: redhat enterprise_linux Access of Uninitialized Pointer

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-26599DEBIAN-CVE-2025-26599
Published 25-02-2025Last modified 29-06-2026
Open JSON

Vulnerability summary

CVE-2025-26599 is a high (CVSS 7.8) Access of Uninitialized Pointer vulnerability in redhat enterprise_linux. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.2% 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
0.40%
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

An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.01 pp

From 0.40% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.40%

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