{"id":"CVE-2026-89649","title":"kernel: ceph: bound xattr value length in __build_xattrs() (CVE-2026-89649)","summary":"A flaw was found in the Linux kernel's Ceph file system (CephFS) component. A malicious or compromised metadata server can manipulate the length of an extended attribute (xattr) value, causing the system to read beyond the intended memory …","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-125","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"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:12:31+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89649.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89649.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89649"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532268"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89649"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89649"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89649.mbox"},{"url":"https://git.kernel.org/stable/c/848b80ca6b410f350d08b8ac19a00ef88223f2ea"},{"url":"https://git.kernel.org/stable/c/01e3f19c301d492e12f16b3b463ac14d7cf3ebe7"},{"url":"https://git.kernel.org/stable/c/cb0cd79ae80476d1bc06bd9678484b6736f19588"},{"url":"https://git.kernel.org/stable/c/61f085cb8976c9cebc90e1a8933e4cc1ad8b0fce"},{"url":"https://git.kernel.org/stable/c/38be2f3c41ecaba58bb92dc16603e09ba9fd64f1"},{"url":"https://git.kernel.org/stable/c/1dd356310b1660215f9a3626580bf8b363ef981e"},{"url":"https://git.kernel.org/stable/c/b12b3320c81fd72ab36388fb2445fec9c3038f10"},{"url":"https://git.kernel.org/stable/c/68d541754d6cd3bb98d1fd8314f57e5eb533557d"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00669,"epssPercentile":0.50502,"scores":{"vendor":7,"cna":9.1},"ingestedAt":"2026-09-14T15:23:07.450Z","slug":"CVE-2026-89649","body":"## Overview\n\nA flaw was found in the Linux kernel's Ceph file system (CephFS) component. A malicious or compromised metadata server can manipulate the length of an extended attribute (xattr) value, causing the system to read beyond the intended memory boundary. This out-of-bounds read allows a local user to access sensitive data from the kernel's memory, leading to information disclosure.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · 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 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89649.json)\n\n**kernel: ceph: bound xattr value length in __build_xattrs()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\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\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\nNot affected:\n\n- Red Hat Enterprise Linux 6\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208118,"id":"CVE-2026-89649","ts":1789922716138,"field":"cvss","old":"9.1","new":"7"},{"seq":208117,"id":"CVE-2026-89649","ts":1789922716138,"field":"severity","old":"critical","new":"high"},{"seq":197809,"id":"CVE-2026-89649","ts":1789384320492,"field":"cvss","old":"6.3","new":"9.1"},{"seq":197808,"id":"CVE-2026-89649","ts":1789384320492,"field":"severity","old":"medium","new":"critical"},{"seq":183375,"id":"CVE-2026-89649","ts":1789356675102,"field":"cvss","old":"9.1","new":"6.3"},{"seq":183374,"id":"CVE-2026-89649","ts":1789356675102,"field":"severity","old":"critical","new":"medium"},{"seq":153496,"id":"CVE-2026-89649","ts":1789285350798,"field":"cvss","old":null,"new":"9.1"},{"seq":153495,"id":"CVE-2026-89649","ts":1789285350798,"field":"severity","old":"none","new":"critical"},{"seq":147448,"id":"CVE-2026-89649","ts":1789270210948,"field":"cvss","old":null,"new":"6.3"},{"seq":147447,"id":"CVE-2026-89649","ts":1789270210948,"field":"severity","old":"none","new":"medium"},{"seq":109204,"id":"CVE-2026-89649","ts":1789183730716,"field":"cvss","old":null,"new":"6.3"},{"seq":109203,"id":"CVE-2026-89649","ts":1789183730716,"field":"severity","old":"none","new":"medium"}]}