{"id":"CVE-2026-89487","title":"kernel: openvswitch: only skb_tx_error() a packet we are about to drop (CVE-2026-89487)","summary":"A flaw was found in openvswitch in the Linux kernel. This vulnerability occurs when the `queue_userspace_packet()` function incorrectly modifies a shared network packet buffer by stripping a critical flag. This action can lead to an unpriv…","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-367","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4","enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T08:13:00+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89487.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89487.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89487"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532517"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89487"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89487"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89487.mbox"},{"url":"https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a"},{"url":"https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545"},{"url":"https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69"},{"url":"https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6"},{"url":"https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae"},{"url":"https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa"},{"url":"https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e"},{"url":"https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00129,"epssPercentile":0.02914,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89487","body":"## Overview\n\nA flaw was found in openvswitch in the Linux kernel. This vulnerability occurs when the `queue_userspace_packet()` function incorrectly modifies a shared network packet buffer by stripping a critical flag. This action can lead to an unprivileged page-cache write, allowing a local attacker to modify data in memory that they should not have access to. This could potentially result in information disclosure or privilege escalation.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89487.json)\n\n**kernel: openvswitch: only skb_tx_error() a packet we are about to drop** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\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- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203932,"id":"CVE-2026-89487","ts":1789490227640,"field":"cvss","old":"7.8","new":"7"},{"seq":198010,"id":"CVE-2026-89487","ts":1789384321371,"field":"cvss","old":"7.1","new":"7.8"},{"seq":183521,"id":"CVE-2026-89487","ts":1789356675712,"field":"cvss","old":"7.8","new":"7.1"},{"seq":153272,"id":"CVE-2026-89487","ts":1789285349830,"field":"cvss","old":null,"new":"7.8"},{"seq":153271,"id":"CVE-2026-89487","ts":1789285349830,"field":"severity","old":"none","new":"high"},{"seq":147091,"id":"CVE-2026-89487","ts":1789270195128,"field":"cvss","old":null,"new":"7.1"},{"seq":147090,"id":"CVE-2026-89487","ts":1789270195128,"field":"severity","old":"none","new":"high"}]}