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CVE-2023-6377— Xorg-x11-server: out-of-bounds memory reads/writes in xkb button actions

Quick assessment

Affected

Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

xorg-x11-server是X.org基金会的一款X窗口系统显示服务器。 xorg-server 21.1.10之前版本、xwayland 23.2.3之前版本存在安全漏洞，该漏洞源于通过查询或更改 XKB 按钮操作可能会导致内存读写越界，在涉及 X11 转发的情况下，这可能允许本地权限升级或可能的远程代码执行。

CVSS 7.8 · High EPSS 1.57% · P74 Updated Jun 27, 2026

Possible ATT&CK Techniques 2 AI

T1059 · Command and Scripting Interpreter T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

Vendor	Product	Version Range	Status
Red Hat	Red Hat Enterprise Linux 6	`any`	unknown
Red Hat	Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION	`0:1.1.0-25.el6_10.14< *`	unaffected
Red Hat	Red Hat Enterprise Linux 7	`0:1.8.0-28.el7_9< *`	unaffected
		`0:1.20.4-25.el7_9< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8	`0:1.13.1-2.el8_9.4< *`	unaffected
		`0:1.20.11-22.el8< *`	unaffected
		`0:21.1.3-15.el8< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.2 Advanced Update Support	`0:1.9.0-15.el8_2.6< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.2 Telecommunications Update Service	`0:1.9.0-15.el8_2.6< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions	`0:1.9.0-15.el8_2.6< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	`0:1.11.0-8.el8_4.5< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.4 Telecommunications Update Service	`0:1.11.0-8.el8_4.5< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions	`0:1.11.0-8.el8_4.5< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support	`0:1.12.0-6.el8_6.6< *`	unaffected
Red Hat	Red Hat Enterprise Linux 8.8 Extended Update Support	`0:1.12.0-15.el8_8.4< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9	`0:1.13.1-3.el9_3.3< *`	unaffected
		`0:1.20.11-24.el9< *`	unaffected
		`0:22.1.9-5.el9< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	`0:1.11.0-22.el9_0.5< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	`0:1.12.0-14.el9_2.2< *`	unaffected

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I. Basic Information for CVE-2023-6377

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

Xorg-x11-server: out-of-bounds memory reads/writes in xkb button actions

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存读

Source: CVE Program / CVE List V5

Vulnerability Title

xorg-server 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION	0:1.1.0-25.el6_10.14 ~ *	`cpe:/o:redhat:rhel_els:6`
Red Hat	Red Hat Enterprise Linux 7	0:1.8.0-28.el7_9 ~ *	`cpe:/o:redhat:enterprise_linux:7::computenode`
Red Hat	Red Hat Enterprise Linux 7	0:1.20.4-25.el7_9 ~ *	`cpe:/o:redhat:enterprise_linux:7::computenode`
Red Hat	Red Hat Enterprise Linux 8	0:1.13.1-2.el8_9.4 ~ *	`cpe:/a:redhat:enterprise_linux:8::appstream`
Red Hat	Red Hat Enterprise Linux 8	0:1.20.11-22.el8 ~ *	`cpe:/a:redhat:enterprise_linux:8::appstream`
Red Hat	Red Hat Enterprise Linux 8	0:21.1.3-15.el8 ~ *	`cpe:/a:redhat:enterprise_linux:8::appstream`
Red Hat	Red Hat Enterprise Linux 8.2 Advanced Update Support	0:1.9.0-15.el8_2.6 ~ *	`cpe:/a:redhat:rhel_e4s:8.2::appstream`
Red Hat	Red Hat Enterprise Linux 8.2 Telecommunications Update Service	0:1.9.0-15.el8_2.6 ~ *	`cpe:/a:redhat:rhel_e4s:8.2::appstream`
Red Hat	Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions	0:1.9.0-15.el8_2.6 ~ *	`cpe:/a:redhat:rhel_e4s:8.2::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	0:1.11.0-8.el8_4.5 ~ *	`cpe:/a:redhat:rhel_tus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Telecommunications Update Service	0:1.11.0-8.el8_4.5 ~ *	`cpe:/a:redhat:rhel_tus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions	0:1.11.0-8.el8_4.5 ~ *	`cpe:/a:redhat:rhel_tus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support	0:1.12.0-6.el8_6.6 ~ *	`cpe:/a:redhat:rhel_eus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Extended Update Support	0:1.12.0-15.el8_8.4 ~ *	`cpe:/a:redhat:rhel_eus:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:1.13.1-3.el9_3.3 ~ *	`cpe:/a:redhat:enterprise_linux:9::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:1.20.11-24.el9 ~ *	`cpe:/a:redhat:enterprise_linux:9::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:22.1.9-5.el9 ~ *	`cpe:/a:redhat:enterprise_linux:9::appstream`
Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	0:1.11.0-22.el9_0.5 ~ *	`cpe:/a:redhat:rhel_eus:9.0::appstream`
Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	0:1.12.0-14.el9_2.2 ~ *	`cpe:/a:redhat:rhel_eus:9.2::appstream`
Red Hat	Red Hat Enterprise Linux 6	-	`cpe:/o:redhat:enterprise_linux:6`

II. Public POCs for CVE-2023-6377

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2023-6377

请登录查看更多情报信息。

Vendor Advisories for CVE-2023-6377 (19)

https://security.netapp.com/advisory/ntap-20240125-0003/
https://access.redhat.com/security/cve/CVE-2023-6377 vdb-entry x_refsource_REDHAT
https://www.debian.org/security/2023/dsa-5576
https://security.gentoo.org/glsa/202401-30
https://bugzilla.redhat.com/show_bug.cgi?id=2253291 issue-tracking x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:2996 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0017 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0006 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7886 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0010 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0020 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0015 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:2170 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0018 vendor-advisory x_refsource_REDHAT
🔗 RHSA-2024:2169 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0014 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0016 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:0009 vendor-advisory x_refsource_REDHAT
RHSA-2024:2995 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT

Mailing List Discussions for CVE-2023-6377 (8)

Other References for CVE-2023-6377 (1)

https://gitlab.freedesktop.org/xorg/xserver/-/commit/0c1a93d319558fe3ab2d94f51d174b4f93810afd

https://www.cve.org/CVERecord?id=CVE-2023-6377

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION

Same vendor: Red Hat

Same weakness: CWE-125

V. Comments for CVE-2023-6377

No comments yet

Goal Reached Thanks to every supporter — we hit 100%!

CVE-2023-6377— Xorg-x11-server: out-of-bounds memory reads/writes in xkb button actions

Quick assessment

Possible ATT&CK Techniques 2 AI

Affected Version Matrix 20

I. Basic Information for CVE-2023-6377

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2023-6377

III. Intelligence Information for CVE-2023-6377

Vendor Advisories for CVE-2023-6377 (19)

Mailing List Discussions for CVE-2023-6377 (8)

Other References for CVE-2023-6377 (1)

IV. Related Vulnerabilities

V. Comments for CVE-2023-6377

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