{"id":"CVE-2026-89607","title":"kernel: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet (CVE-2026-89607)","summary":"A flaw was found in ecryptfs in the Linux kernel. The parse_tag_3_packet() function does not properly validate the size of the encrypted key, allowing an oversized key to be processed. This improper validation leads to out-of-bounds writes…","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-787","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T09:42:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89607.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89607.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89607"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532523"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89607"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89607"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89607.mbox"},{"url":"https://git.kernel.org/stable/c/2cd21340163494d312836c77c9fbfe2530b3d075"},{"url":"https://git.kernel.org/stable/c/e2152d491ae62d96a32ed59778680a242af1fbc6"},{"url":"https://git.kernel.org/stable/c/d2802414081184f79a619ede178aeef3aa989793"},{"url":"https://git.kernel.org/stable/c/33e050cac841498b5175f0f385eee903fd98863c"},{"url":"https://git.kernel.org/stable/c/ccd13eff0e7356d2aa28b127b577e4e5ad4563f5"},{"url":"https://git.kernel.org/stable/c/14cb36a500a5a3afbc955dbf69dabc565f1a3b26"},{"url":"https://git.kernel.org/stable/c/a419c9ebfc9a40ee56aaad6dc68bfd67d400817b"},{"url":"https://git.kernel.org/stable/c/5babe9c177c364521e3e682b949c5a8c47f4a441"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00164,"epssPercentile":0.06021,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.451Z","slug":"CVE-2026-89607","body":"## Overview\n\nA flaw was found in ecryptfs in the Linux kernel. The parse_tag_3_packet() function does not properly validate the size of the encrypted key, allowing an oversized key to be processed. This improper validation leads to out-of-bounds writes, corrupting critical data structures within the ecryptfs_auth_tok and ecryptfs_crypt_stat structs. A local attacker could potentially exploit this memory corruption to achieve privilege escalation or cause a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89607.json)\n\n**kernel: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\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\nRefer to the advisory for fix availability.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203923,"id":"CVE-2026-89607","ts":1789490223387,"field":"cvss","old":"7.8","new":"7"},{"seq":197865,"id":"CVE-2026-89607","ts":1789384320727,"field":"cvss","old":"6.3","new":"7.8"},{"seq":197864,"id":"CVE-2026-89607","ts":1789384320727,"field":"severity","old":"medium","new":"high"},{"seq":183429,"id":"CVE-2026-89607","ts":1789356675333,"field":"cvss","old":"7.8","new":"6.3"},{"seq":183428,"id":"CVE-2026-89607","ts":1789356675333,"field":"severity","old":"high","new":"medium"},{"seq":153432,"id":"CVE-2026-89607","ts":1789285350489,"field":"cvss","old":null,"new":"7.8"},{"seq":153431,"id":"CVE-2026-89607","ts":1789285350489,"field":"severity","old":"none","new":"high"},{"seq":147061,"id":"CVE-2026-89607","ts":1789270195002,"field":"cvss","old":null,"new":"6.3"},{"seq":147060,"id":"CVE-2026-89607","ts":1789270195002,"field":"severity","old":"none","new":"medium"}]}