{"id":"CVE-2026-0799","title":"In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value","summary":"In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value.  In particular uncommon use c…","severity":"high","cvss":8.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H","cwe":["CWE-125","CWE-129","CWE-787"],"vendor":"The Tcpdump Group","product":"libpcap","affected":["libpcap < 1.10.7"],"published":"2026-09-05","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:20:25.117","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-0799","references":[{"url":"https://github.com/the-tcpdump-group/libpcap/commit/48e8960a7108e9e828f9d7bdc7e97bdab841aec7","label":"security@tcpdump.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0799.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-0799"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2529093"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-0799"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-0799"},{"url":"https://access.redhat.com/errata/RHSA-2026:74442"},{"url":"https://access.redhat.com/errata/RHSA-2026:74441"},{"url":"https://access.redhat.com/errata/RHSA-2026:76045"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T18:20:35.280967Z"},"epss":0.00108,"epssPercentile":0.01187,"ingestedAt":"2026-09-06T10:53:51.988Z","patched":["enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_codeready_linux_builder_v_9"],"slug":"CVE-2026-0799","body":"## Overview\n\nIn BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value.  In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0799.json)\n- **RHSA-2026:74442** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74442)\n- **RHSA-2026:74441** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74441)\n- **RHSA-2026:76045** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-05 · [advisory](https://access.redhat.com/errata/RHSA-2026:76045)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}