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CVE-2026-72693— Kbd: local privilege escalation in openvt via incorrect process owner verification allowing passwordless root login

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
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.

kbd-project kbd是kbd-project组织开源的一款键盘配置与管理工具。 kbd-project kbd存在权限许可和访问控制问题漏洞，该漏洞源于openvt -u的authenticate_user()函数中所有权测试依赖stat("/proc/<pid>/fd/0")，由于stat()遵循符号链接到TTY设备节点，TTY节点所有者被误认为进程所有者，可能导致非特权进程被错误视为特权控制台所有者，从而在生成的VT上执行无密码的root登录，造成权限提升。

CVSS 7.8 · High EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:2.6.4-8.el10_2< * unaffected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 0:2.4.0-12.el9_8< * unaffected
Red Hat Red Hat Hardened Images 2.10.0-2.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any affected
Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202608251819-0< * unaffected
4.22.9.8.202609081748-0< * unaffected
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I. Basic Information for CVE-2026-72693

Vulnerability Information
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Vulnerability Title
Kbd: local privilege escalation in openvt via incorrect process owner verification allowing passwordless root login
Source: CVE Program / CVE List V5
Vulnerability Description
`openvt -u` is intended to identify the owner of the current VT and then execute `login` as that user from a privileged context. In the documented `kbrequest`/init usage, the ownership test in `authenticate_user()` relies on `stat("/proc/<pid>/fd/0")`. `stat()` on `/proc/<pid>/fd/0` follows the symlink to the underlying TTY device node. As a result, `buf.st_uid` reflects the owner of the TTY node rather than the owner of the process holding the file descriptor. If the TTY owner returns to `root` or the getty owner after logout while an unprivileged process still has `fd 0` attached to that TTY, the check can incorrectly treat that process as belonging to the privileged console owner. Once that check succeeds, the `-u` path executes a passwordless login as the selected user. In the documented `kbrequest`/init deployment using `openvt -us`, this can result in passwordless `login -f root` on the spawned VT. This report establishes that privilege escalation path for that documented deployment; it does not claim equivalent reachability for deployments that do not use `openvt -u` from a privileged `kbrequest`/init path.
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
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
kbd-project kbd 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kbd-project kbd是kbd-project组织开源的一款键盘配置与管理工具。 kbd-project kbd存在权限许可和访问控制问题漏洞，该漏洞源于openvt -u的authenticate_user()函数中所有权测试依赖stat("/proc/<pid>/fd/0")，由于stat()遵循符号链接到TTY设备节点，TTY节点所有者被误认为进程所有者，可能导致非特权进程被错误视为特权控制台所有者，从而在生成的VT上执行无密码的root登录，造成权限提升。
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 Subscribe
Red Hat Red Hat Enterprise Linux 10 0:2.6.4-8.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 9 0:2.4.0-12.el9_8 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202608251819-0 ~ * cpe:/a:redhat:openshift:4.22::el9
Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202609081748-0 ~ * cpe:/a:redhat:openshift:4.22::el9
Red Hat Red Hat Hardened Images 2.10.0-2.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-72693

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III. Intelligence Information for CVE-2026-72693

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Vendor Advisories for CVE-2026-72693 (7)

Same Patch Batch · Red Hat · 2026-08-11 · 29 CVEs total

CVE-2026-10579 9.8 CRITICAL Picketlink-federation: auth bypass in picketlink saml unsolicited-response
CVE-2026-19546 8.8 HIGH Dbi: incomplete fix for cve-2026-14380 dbi: arbitrary code execution via caller-influenced
CVE-2026-15555 8.8 HIGH Jboss-marshalling-river: wildfly-clustering-infinispan-marshalling: jboss deserialization
CVE-2026-19550 8.2 HIGH Freeipa: ipa: freeipa: trust-fetch-domains uses trust-read aci to gate a privileged ad tru
CVE-2026-15556 8.1 HIGH Picketlink-federation: picketlink saml 2.0 auth bypass via missing assertions
CVE-2026-15560 8.1 HIGH Openjdk-orb: unauthed class loading via iiop in eap
CVE-2026-15567 7.5 HIGH Wildfly: wildfly-iiop: wildfly-jacorb: wildfly: pre-auth denial of service on the iiop lis
CVE-2026-71467 7.5 HIGH Acm-search-v2-api-rhel9: search-v2-api: authentication bypass on /federated via upgrade: w
CVE-2026-71217 7.5 HIGH Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote de
CVE-2026-15565 7.5 HIGH Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serveren
CVE-2026-15562 7.5 HIGH Jboss-remoting: jboss-remoting: integer overflow in messagereader leads to pre-authenticat
CVE-2026-15561 7.5 HIGH Undertow-core: oom via missing limits in chunked trailer in eap's undertow
CVE-2026-15563 7.4 HIGH Wildfly-iiop-openjdk: missing authentication on eap's iiop nameservice leads to mitm or do
CVE-2026-15554 7.4 HIGH Undertow-core: undertow: authentication bypass via ajp ssl_cert/is_ssl forgery
CVE-2026-50237 7.4 HIGH Openshift/console: namespace tenant ssrf with egress bypass, catalog poisoning, and admin-
CVE-2026-50236 7.4 HIGH Openshift/console: authenticated ssrf with full response reflection and path neutralizatio
CVE-2026-72694 7.1 HIGH Mrtg: mrtg daemon symlink-following chown allows local privilege escalation via pid file p
CVE-2026-71474 7.1 HIGH Insights-client-rhel9: insights-client: pull-secret bearer token written to logs on non-20
CVE-2026-71475 6.8 MEDIUM Insights-client-rhel9: insights-client: spoke-controlled clusterid injected unencoded into
CVE-2026-24330 6.5 MEDIUM Wildfly-core: wildfly: arbitrary file read via malicious archive deployment

Showing top 20 of 29 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-284

V. Comments for CVE-2026-72693

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