CVE-2026-50264: redhat enterprise_linux Out-of-bounds Write
Vulnerability summary
CVE-2026-50264 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in redhat enterprise_linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 27Timeline
- 05-06-2026PublishedVulnerability first disclosed.
- 28-09-2026Last modifiedVulnerability information updated.
Description
An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for privilege escalation if the X server runs as root.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.20%
Chance of exploitation in the next 30 days
Percentile
10%
Versus all other CVEs
30-day change
+0.05 pp
From 0.15% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu4 products
- xorg-serverAll versions (No fix recorded)
- xorg-server-hwe-16.04All versions (No fix recorded)
- xorg-server-hwe-18.04All versions (No fix recorded)
- xwaylandAll versions (No fix recorded)
Debian2 products
- xorg-server< 2:21.1.7-3+deb12u13 | < 2:21.1.16-1.3+deb13u3 | < 2:21.1.23-1
- xwaylandAll versions (No fix recorded) | < 2:24.1.12-1
Redhat1 product
- enterprise_linuxEOL7.0 | 8.0 | 9.0 | 10.0
4 vendors · 9 products
References
38 linksShow all 38 references
- redhat.atlassian.net/browse/PSIRTSUPT-16950Permissions Required
