CVE-2026-101307
criticalpriority · track · 36EPSS 0.003 · 24 %ileDENLUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 4.6–9.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (6)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- NCSC-2026-0452Kwetsbaarheden verholpen in FreeBSD bhyve hypervisorNL2026-10-22csaf · ncsc_nlNL
De FreeBSD community heeft meerdere kwetsbaarheden verholpen in bhyve Hypervisor
- WID-SEC-W-2026-3967FreeBSD Project FreeBSD OS: Mehrere SchwachstellenDeutsch2026-10-14csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in FreeBSD Project FreeBSD OS ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.
sources
Which sources assert this record, and when.
references (1) nvd
External citations — patches, advisories, analysis.
- https://security.freebsd.org/advisories/FreeBSD-SA-26:70.tcp.ascMitigationPatchVendor Advisory
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan