{"id":"CVE-2026-89606","title":"kernel: ecryptfs: reject too-small tag 70 packets (CVE-2026-89606)","summary":"A flaw was found in ecryptfs, a component of the Linux kernel. This vulnerability allows a remote attacker to send a specially crafted tag 70 packet with a body smaller than expected. This can lead to an integer underflow during size calcu…","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-191","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T22:15:26+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89606.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89606.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89606"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532266"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89606"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89606"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89606.mbox"},{"url":"https://git.kernel.org/stable/c/df5f375a6151ef71f636da044bcef90c26697255"},{"url":"https://git.kernel.org/stable/c/5668121974eb7f7aa82793a9d0d13abadb8904dc"},{"url":"https://git.kernel.org/stable/c/2e5afed9503dd1d85004c09503adc2cb584c0188"},{"url":"https://git.kernel.org/stable/c/414a0f04feb06f03523edf7e2a8be1d7f1a9b160"},{"url":"https://git.kernel.org/stable/c/9d88391bbed76eb091cddd50b0af87b1c6f22589"},{"url":"https://git.kernel.org/stable/c/b31da1ecf13929a8d7f8d2727843d2fe35396b75"},{"url":"https://git.kernel.org/stable/c/d2869768eab5648e6edc05f47e0716e5328e6681"},{"url":"https://git.kernel.org/stable/c/e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00138,"epssPercentile":0.03603,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.451Z","slug":"CVE-2026-89606","body":"## Overview\n\nA flaw was found in ecryptfs, a component of the Linux kernel. This vulnerability allows a remote attacker to send a specially crafted tag 70 packet with a body smaller than expected. This can lead to an integer underflow during size calculation, potentially causing a denial of service (DoS) or system instability.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89606.json)\n\n**kernel: ecryptfs: reject too-small tag 70 packets** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n\nNot affected:\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\nOut of support scope","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208080,"id":"CVE-2026-89606","ts":1789922705910,"field":"cvss","old":"7.8","new":"7"},{"seq":197867,"id":"CVE-2026-89606","ts":1789384320735,"field":"cvss","old":"4.7","new":"7.8"},{"seq":197866,"id":"CVE-2026-89606","ts":1789384320735,"field":"severity","old":"medium","new":"high"},{"seq":183435,"id":"CVE-2026-89606","ts":1789356675358,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183434,"id":"CVE-2026-89606","ts":1789356675358,"field":"severity","old":"high","new":"medium"},{"seq":153430,"id":"CVE-2026-89606","ts":1789285350481,"field":"cvss","old":null,"new":"7.8"},{"seq":153429,"id":"CVE-2026-89606","ts":1789285350481,"field":"severity","old":"none","new":"high"},{"seq":147452,"id":"CVE-2026-89606","ts":1789270210963,"field":"cvss","old":null,"new":"4.7"},{"seq":147451,"id":"CVE-2026-89606","ts":1789270210963,"field":"severity","old":"none","new":"medium"},{"seq":109206,"id":"CVE-2026-89606","ts":1789183730724,"field":"cvss","old":null,"new":"4.7"},{"seq":109205,"id":"CVE-2026-89606","ts":1789183730724,"field":"severity","old":"none","new":"medium"}]}