SARA / Free Tools / CVE / CVE-2023-6816

CVE-2023-6816 — A flaw was found in X

A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular num

CVSS
9.8 CRITICAL
EPSS
3.26% (top 13.00%)
CWE
CWE-787
Published
2024-01-18T04:31:07.908Z
Last modified
2025-11-20T07:07:48.385Z
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

01What is this vulnerability?

A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.

02Affected products

VendorProductVersions
Red HatRed Hat Enterprise Linux 6 Extended Lifecycle SupportEXTENSION — 0:1.1.0-25.el6_10.13
Red HatRed Hat Enterprise Linux 70:1.20.4-27.el7_9
Red HatRed Hat Enterprise Linux 70:1.8.0-31.el7_9
Red HatRed Hat Enterprise Linux 80:1.13.1-2.el8_9.7
Red HatRed Hat Enterprise Linux 80:21.1.3-15.el8
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Support0:1.9.0-15.el8_2.9
Red HatRed Hat Enterprise Linux 8.2 Telecommunications Update Service0:1.9.0-15.el8_2.9
Red HatRed Hat Enterprise Linux 8.2 Update Services for SAP Solutions0:1.9.0-15.el8_2.9
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:1.11.0-8.el8_4.8
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update Service0:1.11.0-8.el8_4.8
Red HatRed Hat Enterprise Linux 8.4 Update Services for SAP Solutions0:1.11.0-8.el8_4.8
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support0:1.12.0-6.el8_6.9
Red HatRed Hat Enterprise Linux 8.8 Extended Update Support0:1.12.0-15.el8_8.7
Red HatRed Hat Enterprise Linux 90:1.13.1-3.el9_3.6
Red HatRed Hat Enterprise Linux 90:1.20.11-24.el9
Red HatRed Hat Enterprise Linux 90:22.1.9-5.el9
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support0:1.11.0-22.el9_0.8
Red HatRed Hat Enterprise Linux 9.2 Extended Update Support0:1.12.0-14.el9_2.5
Red HatRed Hat Enterprise Linux 6unspecified
Red HatRed Hat Enterprise Linux 8unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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