Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictions
CVSS score
5.5
EPSS probability
%0.1
Risk score
0.0
Published
1 d ago
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Impact on My Inventory
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%55
Short explanation
BusyBox mount utility contains a flaw that lets a non‑root user bypass mount security restrictions defined in /etc/fstab by using clearing‑mask options, potentially overriding nosuid, nodev, and noexec flags.
Bypassing these restrictions can allow unprivileged users to execute privileged binaries or access devices, increasing the risk of privilege escalation.
What should be done?
- Monitor vendor advisories for a patch
- Apply the vendor‑provided fix when released
- Restrict mount command usage for unprivileged users
- Consider alternative init systems or mount implementations
- Enforce additional mandatory access controls (e.g., SELinux)
Chain of evidence and sources
CVE-2026-88838, bir non‑root kullanıcının /etc/fstab'taki mount güvenlik kısıtlamalarını temizleme‑mask seçenekleriyle atlatmasına izin verir.
Bu zafiyetin CVSS temel skoru 5.5 (MEDIUM) olarak belirlenmiştir.
CISA KEV listesinde yer almadığı için aktif istismar raporlanmamıştır.
Yama durumu UNKNOWN olarak rapor edilmiştir; resmi bir düzeltme henüz doğrulanmamıştır.
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE: CWE-693
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-88838 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Red Hat | Red Hat Hardened Images | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 5.5 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N | CVE CNA |
| 5.5 | CVSS V31 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-88838 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-88838 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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