CVE intelligence and bounded remediation
CVE-2022-23084 — The total size of the user-provided nmreq to nmreq_copyin() was first computed and then trusted during the copyin
The total size of the user-provided nmreq to nmreq_copyin() was first computed and then trusted during the copyin. This time-of-check to time-of-use bug could lead to kernel memory corruption. On systems configured to include netmap in their devfs_ruleset, a privileged process running in a jail can affect the host environment.
- Severity
- High
- CVSS
- 7.8 (3.1)
- Published
- 2024-02-15
- CISA KEV
- Not currently listed
- Ecosystem
- operating-system
- Weaknesses
- CWE-367
Affected products
- freebsd / freebsd
- freebsd / freebsd / 12.3
- freebsd / freebsd / 13.0
Showing 3 representative product identities from 28 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.
Matched remediation archetype
Race condition, TOCTOU, and lifecycle synchronization
This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.
Check exposure
- Map concurrent actors, shared state, lock boundaries, signals, callbacks, retries, and check-then-use sequences in the affected path.
- Determine whether untrusted users can influence timing, object names, filesystem state, or repeated state transitions.
- Identify clustered and multi-process behavior that repository-local tests may not represent.
Remediate safely
- Make the sensitive state transition atomic or protect it with a consistently ordered synchronization primitive.
- Perform authorization and invariant checks on the same authoritative object and transaction used for the operation.
- Use unique private resources, safe ownership transfer, and idempotent operations; add deterministic concurrency regression tests.
Authoritative sources
Complete CVE record and remediation plan
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