CVE-2026-57842 NetBSD - Use After Free

NetBSD contains a use-after-free and double-free vulnerability caused by a missing return statement in msg_recv_copyin() within the COMPAT_NETBSD32 layer, letting local users trigger kernel panic or memory corruption by calling recvmsg() with specific msg_iovlen values.

CVSS base score 7.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026
Weakness
CWE-415

Vendor fix

Update to the latest NetBSD version with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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