Out-of-bounds Read in Red Hat Enterprise Linux 10
CVE-2026-34003
A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.002 · change: -0.001
Affected products
- Red Hat Enterprise Linux 10 — versions 0:24.1.5-6.el10_1, 0:24.1.9-4.el10_2
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:24.1.5-6.el10_0
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 6 Extended Lifecycle Support - Extension — versions 0:1.1.0-25.el6_10.16
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:1.20.4-34.el7_9, 0:1.8.0-36.el7_9.4
- Red Hat Enterprise Linux 8 — versions 0:21.1.3-20.el8_10, 0:1.20.11-28.el8_10, 0:1.15.0-9.el8_10
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support — versions 0:1.11.0-8.el8_4.15, 0:1.20.10-4.el8_4
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On — versions 0:1.11.0-8.el8_4.15, 0:1.20.10-4.el8_4
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support — versions 0:21.1.3-2.el8_6.6, 0:1.12.0-6.el8_6.17, 0:1.20.11-7.el8_6
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:10739 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:11352 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:11369 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:11388 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:11656 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:11692 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:13414 (vendor-advisory)
- access.redhat.com/security/cve/CVE-2026-34003 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:19125 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-34003?
- CVE-2026-34003 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 7.8/10. Published 2026-04-23.
- How severe is CVE-2026-34003?
- High severity. CVSS v3 base score is 7.8 out of 10.