Answer in brief
CVE-2026-57842 records a High severity (CVSS 7.3) vulnerability in NetBSD COMPAT_NETBSD32 Double Free / Use-After-Free via recvmsg() msg_iovlen. The current sources do not mark it as known exploited. The current feed maps The NetBSD Foundation/NetBSD (generic), The NetBSD Foundation/NetBSD (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps The NetBSD Foundation/NetBSD (generic), The NetBSD Foundation/NetBSD (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| The NetBSD Foundation/NetBSDgeneric | >=8.0 <=8.3 || >=9.0 <9.5 || >=10.0 <=10.1 | 9.5 |
| The NetBSD Foundation/NetBSDgeneric | 8.0 || >=9.0 <9.5 || 10.0 | 9.5 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.