{"id":"CVE-2026-89532","title":"kernel: svcrdma: Fix pcl_for_each_segment for empty chunks (CVE-2026-89532)","summary":"A flaw was found in the Linux kernel's svcrdma component. A remote attacker could send a specially crafted network packet that causes an integer underflow in the `pcl_for_each_segment` function when processing a chunk with zero segments. T…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-125","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T10:08:02+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89532.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89532.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89532"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532488"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89532"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89532"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89532.mbox"},{"url":"https://git.kernel.org/stable/c/1e2e3481e39103a386b86be1c33eaef97cbdf16e"},{"url":"https://git.kernel.org/stable/c/3a78b841879c2a3243f74edc514236fb2907167f"},{"url":"https://git.kernel.org/stable/c/06d0390c37fa6714624af771bd72bbf1a7ed9bb1"},{"url":"https://git.kernel.org/stable/c/9c5a03c3dc505c0295339b0a1b9e4fe36447e482"},{"url":"https://git.kernel.org/stable/c/a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8"},{"url":"https://git.kernel.org/stable/c/6d33a7e6bf6c6b293a266a617201285a1ad32c56"},{"url":"https://git.kernel.org/stable/c/b7713a784c59515d0aba558c8f5df6a0164dd3a9"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00509,"epssPercentile":0.42443,"scores":{"vendor":7,"cna":9.1},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89532","body":"## Overview\n\nA flaw was found in the Linux kernel's svcrdma component. A remote attacker could send a specially crafted network packet that causes an integer underflow in the `pcl_for_each_segment` function when processing a chunk with zero segments. This vulnerability leads to an out-of-bounds read, resulting in a general protection fault and a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, 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 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89532.json)\n\n**kernel: svcrdma: Fix pcl_for_each_segment for empty chunks** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\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 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":203869,"id":"CVE-2026-89532","ts":1789490210426,"field":"cvss","old":"9.1","new":"7"},{"seq":203868,"id":"CVE-2026-89532","ts":1789490210426,"field":"severity","old":"critical","new":"high"},{"seq":197967,"id":"CVE-2026-89532","ts":1789384321186,"field":"cvss","old":"5.9","new":"9.1"},{"seq":197966,"id":"CVE-2026-89532","ts":1789384321186,"field":"severity","old":"medium","new":"critical"},{"seq":183502,"id":"CVE-2026-89532","ts":1789356675632,"field":"cvss","old":"9.1","new":"5.9"},{"seq":183501,"id":"CVE-2026-89532","ts":1789356675632,"field":"severity","old":"critical","new":"medium"},{"seq":153324,"id":"CVE-2026-89532","ts":1789285350048,"field":"cvss","old":null,"new":"9.1"},{"seq":153323,"id":"CVE-2026-89532","ts":1789285350048,"field":"severity","old":"none","new":"critical"},{"seq":147139,"id":"CVE-2026-89532","ts":1789270196375,"field":"cvss","old":null,"new":"5.9"},{"seq":147138,"id":"CVE-2026-89532","ts":1789270196375,"field":"severity","old":"none","new":"medium"},{"seq":108882,"id":"CVE-2026-89532","ts":1789183729391,"field":"cvss","old":null,"new":"5.9"},{"seq":108881,"id":"CVE-2026-89532","ts":1789183729391,"field":"severity","old":"none","new":"medium"}]}