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CVE-2026-109976— Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection

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.

发现 clevis PKCS#11 pin 中存在一个漏洞。clevis-pkcs11-afunix-socket-unlock 守护进程在处理 getpeername 返回值时存在整数下溢问题，当 AF_UNIX 客户端连接到数据套接字但未绑定地址时，会导致该守护进程崩溃。此漏洞可导致服务拒绝（DoS），致使系统启动过程中 LUKS 磁盘解密无法完成。

CVSS 4.7 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat OpenShift Container Platform 4 any unaffected
any unaffected
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I. Basic Information for CVE-2026-109976

Vulnerability Information
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Vulnerability Title
Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the clevis PKCS#11 pin. The clevis-pkcs11-afunix-socket-unlock daemon crashes when an AF_UNIX client connects to the data socket without a bound address, due to an integer underflow in the getpeername result handling. This causes a denial of service, preventing LUKS disk decryption from completing during boot.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
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 Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-109976

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III. Intelligence Information for CVE-2026-109976

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Vendor Advisories for CVE-2026-109976 (2)

Same Patch Batch · Red Hat · 2026-10-13 · 9 CVEs total

CVE-2026-109832 7.5 HIGH Gnome-remote-desktop: busy-wait dos in vnc tls i/o handlers (gnutls_e_again / gnutls_e_int
CVE-2026-88833 6.5 MEDIUM Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial
CVE-2026-109833 5.9 MEDIUM Gnome-remote-desktop: heap buffer overflow in gnome-remote-desktop vnc tls peek buffer han
CVE-2026-105460 5.5 MEDIUM Bluez: bluez: stack-based out-of-bounds read in btmon via unvalidated num_keys in return_l
CVE-2026-88838 5.5 MEDIUM Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restr
CVE-2026-88834 3.7 LOW Busybox: busybox: httpd user existence oracle in non-default shadow-disabled builds
CVE-2026-110036 3.3 LOW Device-mapper-persistent-data: device-mapper-persistent-data: denial of service via crafte
CVE-2026-109854 2.5 LOW M17n-lib: uninitialized stack read in iso-2022 compound text utf-8 decoding

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-787

V. Comments for CVE-2026-109976

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