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Vulnerabilities

Vulnerability · CVE-2026-101307

When the PCM sample array needs to grow, the RACK stack doubles a 16-bit allocation counter.

Published Oct 15, 2026 · catalog updated Oct 15, 2026 · FreeBSD FreeBSD

Check if you run it

No confirmed exploitation is on record for CVE-2026-101307. EPSS is 0.31%. Act only if a listed version of FreeBSD FreeBSD is installed.

Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Advisory link
Affected products
vendor FreeBSD FreeBSD

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor FreeBSD FreeBSDversion unspecified

How to fix CVE-2026-101307

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-101307. EPSS is 0.31%. Act only if a listed version of FreeBSD FreeBSD is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-122: Heap-based Buffer Overflow; CWE-787: Out-of-bounds Write. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2026 · NIST NVD

    Detected

    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 est

  2. Oct 15, 2026 · NIST NVD

    Updated

    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 est

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-101307

    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

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-101307

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-101307

    30-day exploitation probability 0.3%

    first.org
  • FreeBSD SecurityVendor advisoryCVE-2026-101307

    CVE-2026-101307 is named by FreeBSD Security.

    freebsd.org
  • NIST NVDVulnerability recordCVE-2026-101307

    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 ca

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.