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CVE-2026-109833— Gnome-remote-desktop: heap buffer overflow in gnome-remote-desktop vnc tls peek buffer handling allows remote denial of service

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.

在 Red Hat Enterprise Linux 所发行的 gnome-remote-desktop 中发现了缺陷。在 VNC TLS 读取路径中，对内部窥视缓冲区（peek buffer）的局部消耗会导致剩余已窥视的字节被错误地写入调用方提供的缓冲区，而非正确地对窥视缓冲区进行压缩。远程攻击者若能访问已启用的 VNC TLS 监听端，并触发窥视/读取大小不匹配，可导致越界写入，进而引发拒绝服务（DoS）。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-109833

Vulnerability Information
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Vulnerability Title
Gnome-remote-desktop: heap buffer overflow in gnome-remote-desktop vnc tls peek buffer handling allows remote denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in gnome-remote-desktop as shipped in Red Hat Enterprise Linux. In the VNC TLS read path, partial consumption of the internal peek buffer incorrectly moves remaining peeked bytes into the caller-supplied buffer instead of compacting the peek buffer. A remote attacker who can reach an enabled VNC TLS listener and trigger a peek/read size mismatch can cause an out-of-bounds write, leading to denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
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 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-109833

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-109833

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Vendor Advisories for CVE-2026-109833 (2)

Same Patch Batch · Red Hat · 2026-10-13 · 8 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-2026-88838 5.5 MEDIUM Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restr
CVE-2026-105460 5.5 MEDIUM Bluez: bluez: stack-based out-of-bounds read in btmon via unvalidated num_keys in return_l
CVE-2026-109976 4.7 MEDIUM Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound
CVE-2026-88834 3.7 LOW Busybox: busybox: httpd user existence oracle in non-default shadow-disabled builds
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-121

V. Comments for CVE-2026-109833

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