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CVE-2026-88838— Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions

Quick assessment

Affected
Red Hat Red Hat Hardened Images
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 BusyBox 的 mount 工具中发现了一个漏洞。非 root 用户可以通过在命令行中指定 clearing-mask 选项，绕过 /etc/fstab 中设置的 mount 安全限制。这些选项会绕过非 root 标志过滤，并与 fstab 中的选项以字符串形式合并；当这些组合选项被重新解析时，清除选项可以覆盖管理员意图执行的 nosuid、nodev 和 noexec 保护措施。

CVSS 5.5 · Medium EPSS 0.11% · P1

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Red Hat Hardened Images any affected
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I. Basic Information for CVE-2026-88838

Vulnerability Information
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Vulnerability Title
Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

II. Public POCs for CVE-2026-88838

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III. Intelligence Information for CVE-2026-88838

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Vendor Advisories for CVE-2026-88838 (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-2026-109976 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-2026-110036 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 Hardened Images
Same vendor: Red Hat
Same weakness: CWE-693

V. Comments for CVE-2026-88838

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