CVE-2024-43102 | umtx Kernel panic or Use-After-Free

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.

Published: 2024-09-05 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-43102 is rated High Risk (67.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.14%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-43102

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-25 0.93% 1.14% +0.21%
2 2026-01-15 1.21% 0.93% -0.28%
3 2026-01-12 — 1.21% —

Full EPSS history (27 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-43102

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-43102

Affected software / configurations for CVE-2024-43102

Vendor Product Version Raw CPE
freebsd freebsd >= 13.0, < 13.3 cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
freebsd freebsd 13.3 cpe:2.3:o:freebsd:freebsd:13.3:-:*:*:*:*:*:*
freebsd freebsd 13.3 cpe:2.3:o:freebsd:freebsd:13.3:p1:*:*:*:*:*:*
freebsd freebsd 13.3 cpe:2.3:o:freebsd:freebsd:13.3:p2:*:*:*:*:*:*
freebsd freebsd 13.3 cpe:2.3:o:freebsd:freebsd:13.3:p3:*:*:*:*:*:*
freebsd freebsd 13.3 cpe:2.3:o:freebsd:freebsd:13.3:p4:*:*:*:*:*:*
freebsd freebsd 13.3 cpe:2.3:o:freebsd:freebsd:13.3:p5:*:*:*:*:*:*
freebsd freebsd 13.4 cpe:2.3:o:freebsd:freebsd:13.4:beta3:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:-:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:beta5:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p1:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p2:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p3:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p4:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p5:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p6:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p7:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p8:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:p9:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:rc3:*:*:*:*:*:*
freebsd freebsd 14.0 cpe:2.3:o:freebsd:freebsd:14.0:rc4-p1:*:*:*:*:*:*
freebsd freebsd 14.1 cpe:2.3:o:freebsd:freebsd:14.1:-:*:*:*:*:*:*
freebsd freebsd 14.1 cpe:2.3:o:freebsd:freebsd:14.1:p1:*:*:*:*:*:*
freebsd freebsd 14.1 cpe:2.3:o:freebsd:freebsd:14.1:p2:*:*:*:*:*:*
freebsd freebsd 14.1 cpe:2.3:o:freebsd:freebsd:14.1:p3:*:*:*:*:*:*

References for CVE-2024-43102

cvelogic Threat Intelligence