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    CVE-2026-88838

    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.

    Published:Oct 13, 2026
    Last Modified:Oct 16, 2026
    EPS:Oct 13, 2026
    EPSS Score:0.00113
    CVSS Score:5.5

    Affected Products

    Vendor
    Busybox
    Product
    Busybox
    Vendor
    Redhat
    Product
    Hummingbird

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-693 Protection Mechanism Failure

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-107 Cross Site Tracing
    CAPEC-127 Directory Indexing
    CAPEC-17 Using Malicious Files
    CAPEC-20 Encryption Brute Forcing
    CAPEC-22 Exploiting Trust in Client
    CAPEC-237 Escaping a Sandbox by Calling Code in Another Language
    CAPEC-36 Using Unpublished Interfaces or Functionality
    CAPEC-477 Signature Spoofing by Mixing Signed and Unsigned Content
    CAPEC-480 Escaping Virtualization
    CAPEC-51 Poison Web Service Registry
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-65 Sniff Application Code
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-74 Manipulating State
    CAPEC-87 Forceful Browsing

    Related CVEs

    CVE-2026-92205 (CVSS 6.1) — BusyBox libarchive Symlink Directory Traversal Arbitrary File Creation Vulnerability. This vulnerability allow…
    CVE-2026-90954 (CVSS 7.8) — A flaw was found in BusyBox's dpkg-deb archive extraction. The ar archive handler flushes deferred symlinks af…
    CVE-2026-88829 (CVSS 7.2) — A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests ma…
    CVE-2026-88834 (CVSS 3.7) — A flaw was found in BusyBox's httpd web server. When configured with system password authentication, a user ex…
    CVE-2026-88833 (CVSS 6.5) — A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the va…
    CVE-2026-108119 (CVSS 6.3) — A flaw was found in busybox. The tar applet's deferred link-creation handling for symlink and hardlink entries…
    CVE-2026-88830 (CVSS 7.5) — A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer…
    CVE-2026-88837 (CVSS 6.5) — BusyBox httpd treats yescrypt ($y$) password hashes as plaintext during Basic Authentication, inverting the au…
    CVE-2026-88835 (CVSS 6.1) — BusyBox dpkg read_package_field() steps past a NUL terminator on malformed .deb packages, causing an out-of-bo…
    CVE-2026-88839 (CVSS 6.7) — BusyBox passwd/group tokenize() references a stale endpoint pointer after trimming, causing an out-of-bounds w…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High