{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  ceph: lock mutex in ceph_mds_check_access()  MDS session OPEN handling replaces mdsc-\u003es_cap_auths under mdsc-\u003emutex, freeing the previous array and its strings.  ceph_mds_check_access() traverses this array without holding the mutex.  A concurrent session reopen can therefore free the array while it is being inspected, resulting in a use-after-free like this:    Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9   [...]   Internal error: Oops: 0000000096000004 [#1]  SMP   Modules linked in:   CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE   [..]   pc : ceph_mds_check_access+0xd4/0x550   lr : ceph_mds_check_access+0xc8/0x550   [...]   Call trace:    ceph_mds_check_access+0xd4/0x550 (P)    ceph_atomic_open+0x138/0xbe8    path_openat+0xa24/0xfa8    do_filp_open+0x94/0x158    do_sys_openat2+0x88/0xf8",
  "id": "DEBIAN-CVE-2026-89990",
  "modified": "2026-09-17T04:47:32.196340488Z",
  "published": "2026-09-16T11:17:10.133Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89990"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-89990"
  ]
}