{"id":"CVE-2026-89608","title":"kernel: ecryptfs: pass packet set buffer size to parser (CVE-2026-89608)","summary":"A flaw was found in the `ecryptfs` component of the Linux kernel. The `ecryptfs_parse_packet_set()` function incorrectly calculates the available buffer size when processing version 1 headers, leading to an overstatement of the buffer's ac…","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-131","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:09:41+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89608.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89608.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89608"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532240"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89608"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89608"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89608.mbox"},{"url":"https://git.kernel.org/stable/c/e7573b0e3058c6bbdfe81673f22c09900fde9e65"},{"url":"https://git.kernel.org/stable/c/66a87559ecb26afe80ad512faf728a158e2b81da"},{"url":"https://git.kernel.org/stable/c/3bd9bb3e167a7c14a50423f6ff03ee0fb007199d"},{"url":"https://git.kernel.org/stable/c/749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac"},{"url":"https://git.kernel.org/stable/c/329de8b9e988b152b938f09224670d97bada0b96"},{"url":"https://git.kernel.org/stable/c/e5d254e654f2311a3c4b9c791d7f216554bcd17a"},{"url":"https://git.kernel.org/stable/c/747fd45be396a6aea3420ab657a0ab4e60185b05"},{"url":"https://git.kernel.org/stable/c/2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00159,"epssPercentile":0.05522,"scores":{"vendor":5.5,"cna":7.1},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89608","body":"## Overview\n\nA flaw was found in the `ecryptfs` component of the Linux kernel. The `ecryptfs_parse_packet_set()` function incorrectly calculates the available buffer size when processing version 1 headers, leading to an overstatement of the buffer's actual capacity. This miscalculation could allow an attacker to cause a denial of service or potentially lead to information disclosure due to out-of-bounds memory access.\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-2026-89608.json)\n\n**kernel: ecryptfs: pass packet set buffer size to parser** — 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":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208127,"id":"CVE-2026-89608","ts":1789922722016,"field":"cvss","old":"7.1","new":"5.5"},{"seq":208126,"id":"CVE-2026-89608","ts":1789922722016,"field":"severity","old":"high","new":"medium"},{"seq":197859,"id":"CVE-2026-89608","ts":1789384320704,"field":"cvss","old":"5.3","new":"7.1"},{"seq":197858,"id":"CVE-2026-89608","ts":1789384320704,"field":"severity","old":"medium","new":"high"},{"seq":183420,"id":"CVE-2026-89608","ts":1789356675293,"field":"cvss","old":"7.1","new":"5.3"},{"seq":183419,"id":"CVE-2026-89608","ts":1789356675293,"field":"severity","old":"high","new":"medium"},{"seq":153434,"id":"CVE-2026-89608","ts":1789285350497,"field":"cvss","old":null,"new":"7.1"},{"seq":153433,"id":"CVE-2026-89608","ts":1789285350497,"field":"severity","old":"none","new":"high"},{"seq":147512,"id":"CVE-2026-89608","ts":1789270211198,"field":"cvss","old":null,"new":"5.3"},{"seq":147511,"id":"CVE-2026-89608","ts":1789270211198,"field":"severity","old":"none","new":"medium"},{"seq":109258,"id":"CVE-2026-89608","ts":1789183731174,"field":"cvss","old":null,"new":"5.3"},{"seq":109257,"id":"CVE-2026-89608","ts":1789183731174,"field":"severity","old":"none","new":"medium"}]}