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alsa-2026:26562
Vulnerability from osv_almalinux
Published
2026-06-17 00:00
Modified
2026-06-17 13:03
Summary
Important: xorg-x11-server-Xwayland security, bug fix, and enhancement update
Details
Xwayland is an X server for running X clients under Wayland.
Security Fix(es):
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch (CVE-2026-50256)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels (CVE-2026-50258)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)
- xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)
Bug Fix(es) and Enhancement(s):
- [xwayland] Backport other security fixes without a CVE assigned [almalinux-8.10.z] (JIRA:AlmaLinux-184293)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
References
{
"affected": [
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "xorg-x11-server-Xwayland"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "21.1.3-20.el8_10.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"details": "Xwayland is an X server for running X clients under Wayland. \n\nSecurity Fix(es): \n\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch (CVE-2026-50256)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels (CVE-2026-50258)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)\n * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)\n\n\nBug Fix(es) and Enhancement(s): \n\n * [xwayland] Backport other security fixes without a CVE assigned [almalinux-8.10.z] (JIRA:AlmaLinux-184293)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
"id": "ALSA-2026:26562",
"modified": "2026-06-17T13:03:03Z",
"published": "2026-06-17T00:00:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://access.redhat.com/errata/RHSA-2026:26562"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50256"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50257"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50258"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50259"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50260"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50261"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50262"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50263"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-50264"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485380"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485382"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485383"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485384"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485385"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485386"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485387"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485388"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2485389"
},
{
"type": "ADVISORY",
"url": "https://errata.almalinux.org/8/ALSA-2026-26562.html"
}
],
"related": [
"CVE-2026-50256",
"CVE-2026-50257",
"CVE-2026-50258",
"CVE-2026-50259",
"CVE-2026-50260",
"CVE-2026-50261",
"CVE-2026-50262",
"CVE-2026-50263",
"CVE-2026-50264"
],
"summary": "Important: xorg-x11-server-Xwayland security, bug fix, and enhancement update"
}
CVE-2026-50256 (GCVE-0-2026-50256)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:31 – Updated: 2026-06-18 01:17
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libxfont2 name length mismatch
Summary
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26610 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50256 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485380 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50257 (GCVE-0-2026-50257)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:31 – Updated: 2026-06-18 01:17
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()
Summary
A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-416 - Use After Free
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26610 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50257 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485382 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50258 (GCVE-0-2026-50258)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:31 – Updated: 2026-06-18 01:18
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb key types due to unchecked shift levels
Summary
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26610 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50258 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485383 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50259 (GCVE-0-2026-50259)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:31 – Updated: 2026-06-18 01:18
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing
Summary
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26610 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50259 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485384 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50260 (GCVE-0-2026-50260)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:36 – Updated: 2026-06-18 01:18
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()
Summary
A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-416 - Use After Free
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26610 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50260 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485385 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50261 (GCVE-0-2026-50261)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:36 – Updated: 2026-06-18 01:18
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in syncchangecounter()
Summary
A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-416 - Use After Free
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26610 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50261 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485386 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50262 (GCVE-0-2026-50262)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:36 – Updated: 2026-06-18 01:20
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds read/write in glx changedrawableattributes
Summary
An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
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| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50262 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485387 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50263 (GCVE-0-2026-50263)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:36 – Updated: 2026-06-18 01:20
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()
Summary
A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-416 - Use After Free
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26610 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50263 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485388 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.20.11-28.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.
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CVE-2026-50264 (GCVE-0-2026-50264)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:36 – Updated: 2026-06-18 01:17
VLAI
EPSS
Title
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds heap write in dri2 drigetbuffers/drigetbufferswithformat
Summary
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.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:26562 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:26590 | vendor-advisoryx_refsource_REDHAT |
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| https://access.redhat.com/errata/RHSA-2026:26709 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-50264 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2485389 | issue-trackingx_refsource_REDHAT |
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | |
| https://lists.x.org/archives/xorg-announce/2026-J… | |
| https://redhat.atlassian.net/browse/PSIRTSUPT-16950 |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:21.1.3-20.el8_10.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8 |
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0:1.20.11-28.el8_10.2 , < *
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cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:24.1.9-4.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.20.11-34.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-06-02 00:00
Credits
This issue was discovered by Peter Hutterer (Red Hat).
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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