CVE-2026-57842
High
Description
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.
SeverityHigh
CVSS7.0
Exploit probability—
ProductNetBSD
PublishedSep 11, 2026
First seenSep 11, 2026
Weakness typeCWE-415CWE-415CWE-416Use after free
How to fix
Update
- The NetBSD Foundation NetBSD9.5 or later
Patches
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| The NetBSD Foundation NetBSD | 8.0 ≤ v ≤ 8.3, 9.0 ≤ v < 9.5, 10.0 ≤ v ≤ 10.1 | 9.5 |
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