{"id":"CVE-2026-6554","title":"libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations","summary":"libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations.  In particular uncommon use cases a crafted filter …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"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-2026-6554","references":[{"url":"https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce","label":"security@tcpdump.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6554.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-6554"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2529091"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6554"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6554"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00098,"epssPercentile":0.00889,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T15:14:56.820512Z"},"ingestedAt":"2026-09-06T10:53:52.249Z","slug":"CVE-2026-6554","body":"## Overview\n\nlibpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations.  In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.\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** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6554.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}