CVE-2026-88839

Summary

BusyBox passwd/group tokenize() references a stale endpoint pointer after trimming, causing an out-of-bounds write of heap pointers.

Affected Software

Weaknesses

• CWE-787: Out-of-bounds Write

Workarounds

Ensure /etc/group and /etc/passwd are writable only by root and protected by mandatory access controls. Monitor these files for unauthorized modifications. Upstream should fix tokenize() to recompute tokenize_end after trimming.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://access.redhat.com/security/cve/CVE-2026-88839
• https://bugzilla.redhat.com/show_bug.cgi?id=2531353

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