CVE-2026-57842

Summary

NetBSD contains a use-after-free and double-free vulnerability in msg_recv_copyin() within the COMPAT_NETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to execute a 32-bit binary on a 64-bit NetBSD system can trigger a kernel panic or memory corruption by calling recvmsg() with msg_iovlen between 9 and IOV_MAX, causing the kernel to access a freed iovec buffer and subsequently free the same allocation a second time.

Affected Software

VendorProductVersion RangeStatus
The NetBSD FoundationNetBSD8.0 <= 8.3affected
The NetBSD FoundationNetBSD9.0 < 9.5affected
The NetBSD FoundationNetBSD10.0 <= 10.1affected

Weaknesses

  • CWE-415: Double Free
  • CWE-416: Use After Free

ADP Enrichment

CISA ADP Vulnrichment

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

References