CVE-2026-34001: Red Hat Enterprise Linux 10 · Expired Pointer Dereference
Affects Red Hat Enterprise Linux 10Source CVE Database V5
Not known to be exploited · CVSS 7.8 High · patch available : patch Red Hat Enterprise Linux 10 soon.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 18% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 23 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10xorg-x11-server-Xwayland | Affected– | Fixed in– |
| Red Hat Enterprise Linux 10xorg-x11-server-Xwayland | Affected– | Fixed in– |
| Red Hat Enterprise Linux 10.0 Extended Update Supportxorg-x11-server-Xwayland | Affected– | Fixed in– |
| Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONtigervnc | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7 Extended Lifecycle Supportxorg-x11-server | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7 Extended Lifecycle Supporttigervnc | Affected– | Fixed in– |
AI-suggested
Red Hat has released official security updates addressing CVE-2026-34001 in the xorg-x11-server-Xwayland package for Red Hat Enterprise Linux 10. Users should apply these updates promptly to remediate the vulnerability. Detailed update instructions are available in Red Hat's advisory and knowledge base article (https://access.redhat.com/articles/11258). Since this is not a cloud service, remediation requires applying the vendor-provided patches. Patch status is confirmed by Red Hat advisories RHSA-2026:10739 and RHSA-2026:11352.
Description
A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially enabling memory corruption. This could result in a denial of service or further compromise of the system.
References
- access.redhat.com/errata/RHSA-2026:10739 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:11352 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:11369 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:11388 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:11656 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:11692 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:13414 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:19125 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:19342 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:19343 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:19344 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20547 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20555 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20557 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20558 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20560 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20561 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20562 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20563 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20575 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20576 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:20590 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21699 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21712 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21715 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21716 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21718 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21741 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:21742 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:22424 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:22456 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:23254 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:23255 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:23496 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:24341 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-34001 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2451109 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34001.json (opens in a new tab)