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PatchSiren cyber security CVE debrief

CVE-2026-88839 Red Hat CVE debrief

CVE-2026-88839 BusyBox passwd/group tokenize() references a stale endpoint pointer after trimming, causing an out-of-bounds write of heap pointers. This MEDIUM-severity vulnerability affects BusyBox installations and could lead to system instability or privilege escalation. Defenders should prioritize verification of affected systems, focusing on BusyBox installations, and review Red Hat errata and security advisories. The vulnerability has a CVSS score of 6.7 and is classified as MEDIUM severity. The CVE record and NVD entry provide initial details on the vulnerability.

Vendor
Red Hat
Product
Red Hat Hardened Images
CVSS
MEDIUM 6.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-23
Original CVE updated
2026-09-25
Advisory published
2026-09-23
Advisory updated
2026-09-25

Who should care

Defenders responsible for BusyBox installations, Red Hat system administrators, and security teams should assess exposure and prioritize verification.

Why it matters

CVE-2026-88839 is a MEDIUM-severity vulnerability in BusyBox that could lead to system instability or privilege escalation. Defenders should prioritize verification of affected systems, focusing on BusyBox installations, and review Red Hat errata and security advisories.

  • Potential for system crashes or instability
  • Possible elevation of privileges
  • Required verification of affected systems
  • Potential for denial-of-service attacks

Technical summary

The BusyBox passwd/group tokenize() function references a stale endpoint pointer after trimming, causing an out-of-bounds write of heap pointers. This vulnerability has a CVSS score of 6.7 and is classified as MEDIUM severity. It affects BusyBox installations and could lead to system instability or privilege escalation. Defenders should prioritize verification of affected systems and assess exposure, focusing on BusyBox installations.

Defensive priority

Defenders should prioritize verification of affected systems and assess exposure, focusing on BusyBox installations.

Recommended defensive actions

  • Verify BusyBox installations and assess exposure
  • Review Red Hat errata and security advisories for affected systems
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide initial details on the vulnerability. Red Hat has provided references to errata and security advisories. The vulnerability affects BusyBox installations and has a CVSS score of 6.7. Defenders should verify affected systems and assess exposure, focusing on BusyBox installations. The NVD entry and Red Hat errata advisory provide additional information on the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-88839 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-88839

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-88839 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-88839

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.