CVE-2026-101307
9.1, criticalFreeBSD Heap-based Buffer Overflow Vulnerability
- CVSS
- 9.1, critical critical CVSS v3.1
- EPSS, next 30 days
- 0.3% higher than 22.1% of scored CVEs
- Exploitation
- No public evidence
- Published
- 15 Oct 20265 days ago
Description
When the PCM sample array needs to grow, the RACK stack doubles a 16-bit allocation counter. Repeated doublings caused the counter to wrap to zero, resulting in a near-zero-length allocation followed by a copy of the existing samples into the undersized buffer. A remote peer can trigger the expansion by sending a sufficient number of ACKs on an established connection. A remote attacker who can establish a TCP connection to a system using the RACK stack can trigger an out-of-bounds write of approximately 512 KB in the kernel heap possibly resulting in a kernel panic.
Details
- Vendor
- FreeBSD
- Product
- FreeBSD
- Weakness
- CWE-122 (opens in a new tab)
- Status
- Analyzed
- Updated
- 20 Oct 2026
- Assigner
- secteam@freebsd.org
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
References 1
Patches and fixes 1
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other FreeBSD CVEs
Every FreeBSD CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2026-101304 When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit… EPSS 0.2% 7.1, high
Beyond this page
Is CVE-2026-101307 in your network?
This page tells you how dangerous CVE-2026-101307 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 20 Oct 2026, not the live upstream state.