Use After Free in FreeBSD
CVE-2024-43102
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- FreeBSD — versions 13.3, 13.4, 14.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security.freebsd.org/advisories/FreeBSD-SA-24:14.umtx.asc (vendor-advisory, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2024-43102?
- CVE-2024-43102 is a critical-severity vulnerability in FreeBSD, classified under Use After Free. CVSS score: 10.0/10. Published 2024-09-05.
- How severe is CVE-2024-43102?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2024-43102 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.