CVE-2026-101307
Remotely triggerable buffer overflow in tcp_rack
- State
- Published
- Severity
- 8.2 High
- Published
- Oct 15, 2026
- Updated
- Oct 15, 2026
- Reserved
- Sep 28, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CISA-ADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FreeBSDFreeBSD |
|
References
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