CVE-2026-101307

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-10-15 07:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-20 00:21 UTC Last updatedMost recent change to the record

Details

Published

2026-10-15 07:17 UTC

Last modified

2026-10-20 00:21 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-122

Record status

Analyzed

Affected

• Freebsd 15.1

Attack profile CVSS 4.0 · 8.2

Attack vector

Network

Complexity

Low

Attack requirements

Present

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High