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VulnerabilityPublished Updated

CVE-2026-34001: Red Hat Enterprise Linux 10 · Expired Pointer Dereference

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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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

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Red Hat Enterprise Linux 10xorg-x11-server-XwaylandAffected–Fixed in–
Red Hat Enterprise Linux 10xorg-x11-server-XwaylandAffected–Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update Supportxorg-x11-server-XwaylandAffected–Fixed in–
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONtigervncAffected–Fixed in–
Red Hat Enterprise Linux 7 Extended Lifecycle Supportxorg-x11-serverAffected–Fixed in–
Red Hat Enterprise Linux 7 Extended Lifecycle SupporttigervncAffected–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

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