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CVE-2026-56000· NVD / CVE Program· CNA suse

xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()

Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.

CriticalCVSS 9.0 · v4.0—No exploit Fix available
Published
Jul 8, 2026
Updated
Jul 9, 2026
EPSS
0.3% · 21th percentile
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Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · suse
9.0
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
x.orgx server
x.orgxwayland

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • x.org x serverbefore 21.2.24
  • x.org xwaylandbefore 24.1.13

Versions reported by the vendor

Affected version ranges reported by the assigning authority (suse). Independent of NVD's CPE analysis and usually ahead of it.

  • X.Org xorg-x11-server

    • before 21.1.24affected · rpm

  • X.Org xwayland

    • before 24.1.13affected · rpmver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10xorg-x11-server-Xwaylandbefore 24.1.9-4.el10_2.324.1.9-4.el10_2.3
AlmaLinux:10xorg-x11-server-Xwayland-develbefore 24.1.9-4.el10_2.324.1.9-4.el10_2.3
AlmaLinux:9xorg-x11-server-Xwaylandbefore 24.1.9-4.el9_8.324.1.9-4.el9_8.3
AlmaLinux:9xorg-x11-server-Xwayland-develbefore 24.1.9-4.el9_8.324.1.9-4.el9_8.3
Debian:12xorg-serverall versions—
Debian:12xwaylandall versions—
Debian:13xorg-serverbefore 2:21.1.16-1.3+deb13u42:21.1.16-1.3+deb13u4
Debian:14xorg-serverbefore 2:21.1.24-12:21.1.24-1
Debian:14xwaylandbefore 2:24.1.13-12:24.1.13-1
openSUSE:Leap 16.0xorg-x11-serverbefore 21.1.15-160000.6.121.1.15-160000.6.1
openSUSE:Leap 16.0xwaylandbefore 24.1.6-160000.6.124.1.6-160000.6.1
openSUSE:Tumbleweedxorg-x11-serverbefore 21.1.21-8.121.1.21-8.1
openSUSE:Tumbleweedxwaylandbefore 24.1.12-1.124.1.12-1.1
Red Hat:enterprise_linux_eus:10.0xorg-x11-server-Xwaylandbefore 0:24.1.5-6.el10_0.20:24.1.5-6.el10_0.2
Red Hat:enterprise_linux_eus:10.0xorg-x11-server-Xwayland-debuginfobefore 0:24.1.5-6.el10_0.20:24.1.5-6.el10_0.2
Red Hat:enterprise_linux_eus:10.0xorg-x11-server-Xwayland-debugsourcebefore 0:24.1.5-6.el10_0.20:24.1.5-6.el10_0.2
Red Hat:enterprise_linux_eus:10.0xorg-x11-server-Xwayland-develbefore 0:24.1.5-6.el10_0.20:24.1.5-6.el10_0.2
Red Hat:enterprise_linux:10.2xorg-x11-server-Xwaylandbefore 0:24.1.9-4.el10_2.30:24.1.9-4.el10_2.3
Red Hat:enterprise_linux:10.2xorg-x11-server-Xwayland-debuginfobefore 0:24.1.9-4.el10_2.30:24.1.9-4.el10_2.3
Red Hat:enterprise_linux:10.2xorg-x11-server-Xwayland-debugsourcebefore 0:24.1.9-4.el10_2.30:24.1.9-4.el10_2.3
Red Hat:enterprise_linux:10.2xorg-x11-server-Xwayland-develbefore 0:24.1.9-4.el10_2.30:24.1.9-4.el10_2.3
Red Hat:enterprise_linux:9::appstreamxorg-x11-server-Xwaylandbefore 0:24.1.9-4.el9_8.30:24.1.9-4.el9_8.3
Red Hat:enterprise_linux:9::appstreamxorg-x11-server-Xwayland-debuginfobefore 0:24.1.9-4.el9_8.30:24.1.9-4.el9_8.3
Red Hat:enterprise_linux:9::appstreamxorg-x11-server-Xwayland-debugsourcebefore 0:24.1.9-4.el9_8.30:24.1.9-4.el9_8.3

+16

Same product

x.org: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-6816Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer
    40Plan
  • CVE-2007-6427The XInput extension in X.Org Xserver before 1.4.1 allows context-dependent attackers to execute arbitrary code via requests related to byte
    38Monitor
  • CVE-2026-34002Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling
    36Monitor
  • CVE-2026-34000Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.
    36Monitor
  • CVE-2022-46344A vulnerability was found in X.Org.
    36Monitor
  • CVE-2022-46343A vulnerability was found in X.Org.
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
X.Org xorg-x11-server21.1.24Vendor (CNA)
X.Org xwayland24.1.13Vendor (CNA)
azl3 xorg-x11-server-Xwayland 24.1.12-1 on Azure Linux 3.024.1.13-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:xorg-x11-server-Xwayland24.1.9-4.el10_2.3 · AlmaLinux:10Package registry (OSV)
almalinux:xorg-x11-server-Xwayland-devel24.1.9-4.el10_2.3 · AlmaLinux:10Package registry (OSV)
debian:xorg-server2:21.1.16-1.3+deb13u4 · Debian:13Package registry (OSV)
debian:xwayland2:24.1.13-1 · Debian:14Package registry (OSV)
opensuse:xorg-x11-server21.1.21-8.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:xwayland24.1.12-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:xorg-x11-server-Xwayland0:24.1.9-4.el10_2.3 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:xorg-x11-server-Xwayland-debuginfo0:24.1.9-4.el10_2.3 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:xorg-x11-server-Xwayland-debugsource0:24.1.9-4.el10_2.3 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:xorg-x11-server-Xwayland-devel0:24.1.9-4.el10_2.3 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:xorg-x11-server-Xwayland0:24.1.9-4.el10_2.3 · Rocky Linux:10Package registry (OSV)
suse:xorg-x11-server21.1.11-150600.5.31.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:xwayland24.1.6-160000.6.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-5025733 days apartXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()
    31Monitor
  • CVE-2026-5026033 days apartXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()
    31Monitor
  • CVE-2026-5026133 days apartXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in syncchangecounter()
    31Monitor
  • CVE-2025-26594498 days apartX.org: xwayland: use-after-free of the root cursor
    31Monitor
  • CVE-2025-26600498 days apartXorg: xwayland: use-after-free in playreleasedevents()
    31Monitor
  • CVE-2025-26601498 days apartXorg: xwayland: use-after-free in syncinittrigger()
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records