Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode
Priority LOW 28CWE-200Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · Low
- Fix status
- Partial Red Hat: 5 fixed, 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-200.
Summary
A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0044 38th percentileScored 2026-11-07
Fix Partial xwayland (X.Org): 24.1.7Red Hat: 3 advisoriesRed Hat: 5 fixed, 4 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| x.org | xwayland | before 24.1.7 | 24.1.7 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 10 | — | 24.1.5-4.el10_0 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 1.20.11-31.el9_6 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 23.2.7-4.el9_6 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — | 22.1.9-6.el9_4 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | No fix listed | CNA |
- xwayland Vendorx.org Affected before 24.1.7 Fixed in 24.1.7 Patch available CNA
- Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 24.1.5-4.el10_0 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 1.20.11-31.el9_6 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 23.2.7-4.el9_6 Patch available CNA
- Red Hat Enterprise Linux 9.4 Extended Update Support VendorRed Hat Affected — Fixed in 22.1.9-6.el9_4 Patch available CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
CPE names CNA · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:/o:redhat:enterprise_linux:10.0 | 10.0 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:9::appstream | 9 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:9::crb | 9 | — | Red Hat |
| cpe:/a:redhat:rhel_eus:9.4::appstream | 9.4 | — | Red Hat |
| cpe:/o:redhat:rhel_els:6 | 6 | — | Red Hat |
| cpe:/o:redhat:rhel_els:7 | 7 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:8 | 8 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:9 | 9 | — | Red Hat |
- cpe:/o:redhat:enterprise_linux:10.0 Versions 10.0 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:9::appstream Versions 9 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:9::crb Versions 9 — ·Red Hat
- cpe:/a:redhat:rhel_eus:9.4::appstream Versions 9.4 — ·Red Hat
- cpe:/o:redhat:rhel_els:6 Versions 6 — ·Red Hat
- cpe:/o:redhat:rhel_els:7 Versions 7 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:8 Versions 8 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:9 Versions 9 — ·Red Hat
Remediation
- Fix · CNA xwayland (X.Org) Fixed in 24.1.7
Red Hat 3 advisories
- RHSA-2025:10258 Released 2025-07-02 · Red Hat rating Importantxorg-x11-server-Xwayland security update
- Red Hat Enterprise Linux AppStream EUS (v.9.4) xorg-x11-server-Xwayland-22.1.9-6.el9_4
- RHSA-2025:9303 Released 2025-06-23 · Red Hat rating Importantxorg-x11-server and xorg-x11-server-Xwayland security update
- Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-1.20.11-31.el9_6, xorg-x11-server-Xdmx-1.20.11-31.el9_6, xorg-x11-server-Xephyr-1.20.11-31.el9_6 +5
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) xorg-x11-server-Xwayland-23.2.7-4.el9_6, xorg-x11-server-Xwayland-devel-23.2.7-4.el9_6, xorg-x11-server-devel-1.20.11-31.el9_6 +1
- RHSA-2025:9304 Released 2025-06-23 · Red Hat rating Importantxorg-x11-server-Xwayland security update
- Red Hat Enterprise Linux AppStream (v. 10) xorg-x11-server-Xwayland-24.1.5-4.el10_0
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) xorg-x11-server-Xwayland-devel-24.1.5-4.el10_0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 4 more products — RHSA-2025:10258
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2025-31247 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x resize, rotate and reflect (randr) extensionPriority LOW 34
- TI-2025-31246 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extensionPriority LOW 32
- TI-2025-31243 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extensionPriority LOW 32
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 4 more products — RHSA-2025:9303
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2025-31247 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x resize, rotate and reflect (randr) extensionPriority LOW 34
- TI-2025-31246 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extensionPriority LOW 32
- TI-2025-31243 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extensionPriority LOW 32
Show 1 more group
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 4 more products — RHSA-2025:9304
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2025-31247 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x resize, rotate and reflect (randr) extensionPriority LOW 34
- TI-2025-31246 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extensionPriority LOW 32
- TI-2025-31243 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extensionPriority LOW 32
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 9 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2025:9304 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2025:9303 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2025:10258 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2025:9304 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2025:9303 |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-49177
- 2026-10-03 Alias added: GHSA-pw35-9xmg-v8xw
References
More x.org vulnerabilities
- TI-2022-25238 In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for… CVSS 3.1HIGH 7.7
- TI-1999-00519 An X server's access control is disabled (e.g. CVSS 2.0HIGH 10.0
- TI-2021-11657 LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote… CVSS 3.1CRITICAL 9.8
- TI-2018-10465 An issue was discovered in libX11 through 1.6.5. CVSS 3.0CRITICAL 9.8
- TI-2004-00826 Multiple vulnerabilities in libXpm for 6.8.1 and earlier, as used in XFree86 and other… CVSS 2.0HIGH 10.0
- TI-2016-08240 Multiple integer overflows in libXpm before 3.5.12, when a program requests parsing XPM… CVSS 3.0CRITICAL 9.8
Sources
- CVE-2025-49177 · CVE Program
- CVE-2025-49177 · NVD
- FIRST EPSS
- GHSA-pw35-9xmg-v8xw · GitHub Advisory Database · CC BY 4.0
- CVE-2025-49177 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences