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VulnerabilityPublished Updated

CVE-2026-34002: Red Hat Enterprise Linux 10.0 Extended Update Support · Buffer Access with Incorrect Length Value

Affects Red Hat Enterprise Linux 10.0 Extended Update SupportSource CVE Database V5

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Not known to be exploited · CVSS 6.1 Medium · patch available : update Red Hat Enterprise Linux 10.0 Extended Update Support when convenient.

Data as of 2 Nov 2026, 22:58 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 42% 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:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 May 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 2 Nov 2026.

What to do

Affected software

ProductAffectedFixed 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–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportxorg-x11-serverAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupporttigervncAffected–Fixed in–

AI-suggested

Red Hat has released official security updates that address CVE-2026-34002 in the xorg-x11-server and xorg-x11-server-Xwayland packages for Red Hat Enterprise Linux 9.2 and 9.4 Extended Update Support and Update Services for SAP Solutions. Users should apply these updates promptly. For detailed update instructions, refer to Red Hat's advisory and article at https://access.redhat.com/articles/11258. Since this is not a cloud service, remediation requires applying the vendor-provided patches. Patch status is confirmed as fixed in the updated packages referenced in advisories RHSA-2026:20547 and RHSA-2026:20555.

Description

CVE-2026-34002 is a medium severity vulnerability in the X.Org X server's X Keyboard Extension (XKB) modifier map handling. It is an out-of-bounds read flaw that can be exploited by an attacker with access to the X11 server by sending a malformed request. Successful exploitation may lead to information disclosure or cause the server to crash, resulting in denial of service. Red Hat has released security advisories and updates addressing this issue in affected Red Hat Enterprise Linux 9.x Extended Update Support and Update Services for SAP Solutions versions.

References

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