# CVE-2024-43102: umtx Kernel panic or Use-After-Free

Status: published. Published: 2024-09-05. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- FreeBSD / FreeBSD: ≥ 14.1-RELEASE; < p4 (affected, release); ≥ 14.0-RELEASE; < p10 (affected, release); ≥ 13.3-RELEASE; < p6 (affected, release). Source: CNA: freebsd
- freebsd / freebsd: ≥ 14.1; < 14.1_p4 (affected, custom); ≥ 14.0; < 14.0_p10 (affected, custom); ≥ 13.3; < 13.3_p6 (affected, custom). Source: ADP: CISA-ADP

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "13.3",
            "versionStartIncluding": "13.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.3:-:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.3:p1:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.3:p2:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.3:p3:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.3:p4:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.3:p5:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.4:beta3:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:-:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:beta5:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p1:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p2:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p3:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p4:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p5:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p6:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p7:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p8:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:p9:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:rc3:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.0:rc4-p1:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.1:-:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.1:p1:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.1:p2:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:14.1:p3:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: ADP: CISA-ADP

- CVSS 3.1: 10 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H; source: NVD: nvd@nist.gov

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: 0.68% as of 2026-11-03; percentile 52.48%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-416, CWE-911

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://security.freebsd.org/advisories/FreeBSD-SA-24:14.umtx.asc (CNA: freebsd; vendor-advisory)

- https://security.netapp.com/advisory/ntap-20240916-0001/ (ADP: CVE)

- https://security.freebsd.org/advisories/FreeBSD-SA-24:14.umtx.asc (secteam@freebsd.org; Vendor Advisory)

- https://security.netapp.com/advisory/ntap-20240916-0001/ (af854a3a-2127-422b-91ae-364da2661108)

## Provenance

- CNA: freebsd: https://www.cve.org/CVERecord?id=CVE-2024-43102; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-43102; retrieved 2026-11-04; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-43102; retrieved 2026-11-03; source updated Not reported

Revision: 874ce94a51eb44c14e49b05ad084280b8fd54823f8cd1e11e8d76327c39ebf21

Canonical: https://y2.dev/cve/CVE-2024-43102

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