Описание
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
Отчет
An Important integer underflow vulnerability exists in the X.Org X server's XKB compatibility map handling. This flaw allows an attacker with local or remote X11 server access to trigger a buffer read overrun, leading to memory-safety violations and potential denial of service. Red Hat Enterprise Linux systems utilizing the X.Org X server in graphical environments are affected.
Меры по смягчению последствий
To mitigate this issue, restrict access to the X11 server. For remote access, disable X11 forwarding in SSH configurations if not required. Edit /etc/ssh/sshd_config and set X11Forwarding no. After modifying the configuration, restart the sshd service using systemctl restart sshd. Disabling X11 forwarding may impact remote graphical applications.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | xorg-x11-server | Out of support scope | ||
| Red Hat Enterprise Linux 10 | xorg-x11-server-Xwayland | Fixed | RHSA-2026:11352 | 28.04.2026 |
| Red Hat Enterprise Linux 10 | xorg-x11-server-Xwayland | Fixed | RHSA-2026:19125 | 19.05.2026 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | xorg-x11-server-Xwayland | Fixed | RHSA-2026:20563 | 26.05.2026 |
| Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | tigervnc | Fixed | RHSA-2026:23496 | 04.06.2026 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | xorg-x11-server | Fixed | RHSA-2026:20590 | 26.05.2026 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | tigervnc | Fixed | RHSA-2026:22456 | 02.06.2026 |
| Red Hat Enterprise Linux 8 | xorg-x11-server-Xwayland | Fixed | RHSA-2026:11656 | 29.04.2026 |
| Red Hat Enterprise Linux 8 | xorg-x11-server | Fixed | RHSA-2026:11692 | 29.04.2026 |
| Red Hat Enterprise Linux 8 | tigervnc | Fixed | RHSA-2026:13414 | 04.05.2026 |
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Дополнительная информация
Статус:
EPSS
7.8 High
CVSS3
Связанные уязвимости
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling
A flaw was found in the X.Org X server. This integer underflow vulnera ...
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
EPSS
7.8 High
CVSS3