{"id":"CVE-2026-98547","title":"kernel: af_packet: fix integer overflow in prb_calc_retire_blk_tmo() (CVE-2026-98547)","summary":"A flaw was found in the Linux kernel's af_packet network socket implementation. An integer overflow occurs during timeout calculations when configuring packet receive rings with large block sizes. A local user with raw network privileges c…","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","cvssSource":"vendor","cwe":"CWE-190","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-19","sourceUpdated":"2026-10-19T23:55:32+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98547.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98547.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98547"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554940"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98547"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98547"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98547.mbox"},{"url":"https://git.kernel.org/stable/c/02afd75649a4e001031ed82153a5c39312ec0737"},{"url":"https://git.kernel.org/stable/c/eb5b3838b9200dac04bfe33483db0ee8287456fb"},{"url":"https://git.kernel.org/stable/c/297acc571d5813db76b147c745b91031d5f9c960"},{"url":"https://git.kernel.org/stable/c/be1aacff399d519cc48d6b34354a54dd79041140"},{"url":"https://git.kernel.org/stable/c/b2bcc6a254d6f27823a56787668ae4ee8cdb6e71"},{"url":"https://git.kernel.org/stable/c/6279211e7d2456ecd195d236c9ee5e5c6fa5a17a"},{"url":"https://git.kernel.org/stable/c/218a944b9e035d4b47d59c69af6ca13319da15fb"},{"url":"https://git.kernel.org/stable/c/56d82862a0a243ac14ba11b6d7b57ddc2d064b95"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00216,"epssPercentile":0.11984,"ingestedAt":"2026-10-18T15:45:12.266Z","slug":"CVE-2026-98547","body":"## Overview\n\nA flaw was found in the Linux kernel's af_packet network socket implementation. An integer overflow occurs during timeout calculations when configuring packet receive rings with large block sizes. A local user with raw network privileges can exploit this vulnerability by setting an oversized socket buffer size, triggering a continuous, high-frequency timer loop. This condition locks CPU resources and can freeze the system, resulting in a Denial of Service (DoS).\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 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98547.json)\n\n**kernel: af_packet: fix integer overflow in prb_calc_retire_blk_tmo()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-19.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225834,"id":"CVE-2026-98547","ts":1792498471787,"field":"cvss","old":null,"new":"5.5"},{"seq":225833,"id":"CVE-2026-98547","ts":1792498471787,"field":"severity","old":"none","new":"medium"}]}