CVE-2024-43102

umtx Kernel panic or Use-After-Free

State: Published
Severity: 9.8 Critical
Published: Sep 5, 2024
Updated: Sep 16, 2024
Reserved: Aug 27, 2024

Description

Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of UMTX_OP_SHM can lead to decreasing the reference count of the object representing the mapping too many times, causing it to be freed too early.

A malicious code exercizing the UMTX_SHM_DESTROY sub-request in parallel can panic the kernel or enable further Use-After-Free attacks, potentially including code execution or Capsicum sandbox escape.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-416 Use After Free
CWE-911 Improper Update of Reference Count

Affected Products

Product	Versions
FreeBSDFreeBSD	14.1-RELEASE to before p4Affected 14.0-RELEASE to before p10Affected 13.3-RELEASE to before p6Affected

References

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