Remotely triggerable buffer overflow in tcp_rack
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.
CVE-2026-101307
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-101307
FreeBSD
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "FreeBSD",
"modules": [
"tcp"
],
"product": "FreeBSD",
"versions": [
{
"status": "affected",
"version": "15.1-RELEASE",
"lessThan": "p5",
"versionType": "release"
}
],
"defaultStatus": "unknown"
}
]- Related CVEs
- CVE-2026-101307
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #29861 · Revision 1
- Added to Heist Feed
- Publisher date