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CVE-2026-57842

NetBSD COMPAT_NETBSD32 Double Free / Use-After-Free via recvmsg() msg_iovlen

CVSS 4.0 7.3 HIGHCVSS 3.1 7.0 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-57842

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-57842

Published

NetBSD

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "vendor": "The NetBSD Foundation",
                    "product": "NetBSD",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "8.0",
                            "versionType": "custom",
                            "lessThanOrEqual": "8.3"
                        },
                        {
                            "status": "affected",
                            "version": "9.0",
                            "versionType": "custom",
                            "lessThan": "9.5"
                        },
                        {
                            "status": "affected",
                            "version": "10.0",
                            "versionType": "custom",
                            "lessThanOrEqual": "10.1"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON