Red Hat Security Advisory: tigervnc security update
Multiple vulnerabilities have been identified and fixed in the TigerVNC suite and the X. Org X server components used in Red Hat Enterprise Linux 9. 2. These include denial of service, information disclosure, use-after-free leading to potential memory corruption, and data manipulation issues. The vulnerabilities affect the XKB compatibility map, geometry processing, modifier map handling, and memory access in X. Org's X server (xwayland), as well as permission handling in TigerVNC's x0vncserver. Red Hat has issued an important security update addressing these issues.
AI Analysis
Technical Summary
This advisory covers six security vulnerabilities affecting TigerVNC and X.Org X server components in Red Hat Enterprise Linux 9.2. The issues include an integer underflow causing denial of service (CVE-2026-33999), multiple out-of-bounds reads leading to information disclosure and denial of service (CVE-2026-34000, CVE-2026-34002, CVE-2026-34003), a use-after-free vulnerability causing server crashes and potential memory corruption (CVE-2026-34001), and incorrect permissions in TigerVNC's x0vncserver enabling information disclosure, data manipulation, and denial of service (CVE-2026-34352). These vulnerabilities collectively impact the remote display functionality and underlying X server components, potentially affecting system stability and confidentiality.
Potential Impact
The vulnerabilities can lead to denial of service conditions causing server crashes, information disclosure exposing sensitive data, potential memory corruption, and unauthorized data manipulation due to incorrect permissions. These impacts affect the TigerVNC remote display system and the X.Org X server's XKB handling components, potentially disrupting remote desktop services and exposing information to unauthorized parties.
Mitigation Recommendations
Red Hat has released an important security update for TigerVNC and related X.Org X server components in Red Hat Enterprise Linux 9.2 that addresses all listed vulnerabilities. Users should apply the update as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) to remediate these issues. No additional mitigation steps are indicated beyond applying the official update.
Red Hat Security Advisory: tigervnc security update
Description
Multiple vulnerabilities have been identified and fixed in the TigerVNC suite and the X. Org X server components used in Red Hat Enterprise Linux 9. 2. These include denial of service, information disclosure, use-after-free leading to potential memory corruption, and data manipulation issues. The vulnerabilities affect the XKB compatibility map, geometry processing, modifier map handling, and memory access in X. Org's X server (xwayland), as well as permission handling in TigerVNC's x0vncserver. Red Hat has issued an important security update addressing these issues.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers six security vulnerabilities affecting TigerVNC and X.Org X server components in Red Hat Enterprise Linux 9.2. The issues include an integer underflow causing denial of service (CVE-2026-33999), multiple out-of-bounds reads leading to information disclosure and denial of service (CVE-2026-34000, CVE-2026-34002, CVE-2026-34003), a use-after-free vulnerability causing server crashes and potential memory corruption (CVE-2026-34001), and incorrect permissions in TigerVNC's x0vncserver enabling information disclosure, data manipulation, and denial of service (CVE-2026-34352). These vulnerabilities collectively impact the remote display functionality and underlying X server components, potentially affecting system stability and confidentiality.
Potential Impact
The vulnerabilities can lead to denial of service conditions causing server crashes, information disclosure exposing sensitive data, potential memory corruption, and unauthorized data manipulation due to incorrect permissions. These impacts affect the TigerVNC remote display system and the X.Org X server's XKB handling components, potentially disrupting remote desktop services and exposing information to unauthorized parties.
Mitigation Recommendations
Red Hat has released an important security update for TigerVNC and related X.Org X server components in Red Hat Enterprise Linux 9.2 that addresses all listed vulnerabilities. Users should apply the update as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) to remediate these issues. No additional mitigation steps are indicated beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:20576
- Cve Count
- 6
- Additional Cves
- ["CVE-2026-34000","CVE-2026-34001","CVE-2026-34002","CVE-2026-34003","CVE-2026-34352"]
- Cvss Version
- null
Threat ID: 6a160980e29bf47b5064cbc3
Added to database: 5/26/2026, 8:58:40 PM
Last enriched: 5/26/2026, 10:26:36 PM
Last updated: 5/27/2026, 4:49:17 AM
Views: 2
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