{"id":"CVE-2026-101307","title":"When the PCM sample array needs to grow, the RACK stack doubles a 16-bit allocation counter","summary":"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 in…","severity":"high","cvss":8.2,"cvssVector":"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","cwe":["CWE-122","CWE-787"],"vendor":"FreeBSD","product":"FreeBSD","affected":["FreeBSD >= 15.1-RELEASE < p5"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T17:17:08.527","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-101307","references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:70.tcp.asc","label":"secteam@freebsd.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T15:31:46.531780Z"},"cvssSource":"adp","ingestedAt":"2026-10-15T07:57:27.844Z","epss":0.00313,"epssPercentile":0.24085,"slug":"CVE-2026-101307","body":"## Overview\n\nWhen 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.\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":222615,"id":"CVE-2026-101307","ts":1792084970360,"field":"cvss","old":"6.5","new":"8.2"},{"seq":222614,"id":"CVE-2026-101307","ts":1792084970360,"field":"severity","old":"medium","new":"high"},{"seq":222448,"id":"CVE-2026-101307","ts":1792081008970,"field":"cvss","old":null,"new":"6.5"},{"seq":222447,"id":"CVE-2026-101307","ts":1792081008970,"field":"severity","old":"none","new":"medium"}]}