What is CVE-2026-57842?

CVE-2026-57842 is a high-severity vulnerability in The NetBSD Foundation, classified under Double Free. CVSS score: 7.0/10. Published 2026-09-11.

How severe is CVE-2026-57842?

High severity. CVSS v3 base score is 7.0 out of 10.

Double Free in The NetBSD Foundation

CVE-2026-57842

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.

Vulnerability class: Double Free

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

The Netbsd Foundation

Weakness classification (CWE)

References

disclosure@vulncheck.com (vendor-advisory, patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-57842?: CVE-2026-57842 is a high-severity vulnerability in The NetBSD Foundation, classified under Double Free. CVSS score: 7.0/10. Published 2026-09-11.
How severe is CVE-2026-57842?: High severity. CVSS v3 base score is 7.0 out of 10.