{"id":"CVE-2026-89525","title":"kernel: udf: reject VAT indexes equal to the entry count (CVE-2026-89525)","summary":"A flaw was found in the Linux kernel. A local attacker could craft a malicious Universal Disk Format (UDF) image to trigger an out-of-bounds read vulnerability in the `udf_get_pblock_virt15()` function. This occurs when the system attempts…","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-1285","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T06:19:18+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89525.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89525.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89525"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532509"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89525"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89525"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89525.mbox"},{"url":"https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589"},{"url":"https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7"},{"url":"https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4"},{"url":"https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053"},{"url":"https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c"},{"url":"https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1"},{"url":"https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6"},{"url":"https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00184,"epssPercentile":0.08242,"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89525","body":"## Overview\n\nA flaw was found in the Linux kernel. A local attacker could craft a malicious Universal Disk Format (UDF) image to trigger an out-of-bounds read vulnerability in the `udf_get_pblock_virt15()` function. This occurs when the system attempts to read a Virtual Allocation Table (VAT) index equal to the entry count, bypassing a bounds check. This can lead to reading memory beyond the allocated table, potentially causing a kernel panic 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 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89525.json)\n\n**kernel: udf: reject VAT indexes equal to the entry count** — rated Moderate 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 6\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\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\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":203944,"id":"CVE-2026-89525","ts":1789490230702,"field":"cvss","old":null,"new":"5.5"},{"seq":203943,"id":"CVE-2026-89525","ts":1789490230702,"field":"severity","old":"none","new":"medium"},{"seq":147109,"id":"CVE-2026-89525","ts":1789270195208,"field":"cvss","old":null,"new":"4"},{"seq":147108,"id":"CVE-2026-89525","ts":1789270195208,"field":"severity","old":"none","new":"medium"},{"seq":108856,"id":"CVE-2026-89525","ts":1789183729274,"field":"cvss","old":null,"new":"4"},{"seq":108855,"id":"CVE-2026-89525","ts":1789183729274,"field":"severity","old":"none","new":"medium"}]}