Remotely triggerable buffer overflow in tcp_rack
CVSS score
—
EPSS probability
%0.2
Risk score
—
Published
8 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
CVE-2026-101307 is a remotely triggerable buffer overflow vulnerability located in tcp_rack. In systems utilizing the RACK stack, counter wrapping during the growth of the PCM sample array can lead to an out-of-bounds write in the kernel heap.
A remote attacker can trigger an out-of-bounds write of approximately 512 KB in the kernel heap by sending a sufficient number of ACKs over an established TCP connection, potentially resulting in a kernel panic.
What should be done?
- Follow official vendor advisories
- Review the corresponding FreeBSD security advisory
- Apply available updates or workarounds
Chain of evidence and sources
Uzak bir saldırgan, kurulu bir TCP bağlantısı üzerinden yeterli sayıda ACK göndererek sınır dışı yazma tetikleyebilir.
Sayaç taşması neredeyse sıfır uzunlukta tahsisata ve çekirdek yığınında yaklaşık 512 KB sınır dışı yazmaya neden olur.
Show the technical text from the sources
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.
CWE: CWE-122, CWE-787
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-101307 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | freebsd | freebsd | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-101307 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-101307 weaknesses.
Official Sources and Advisories
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