{"id":"CVE-2026-89990","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: lock mutex in ceph_mds_check_access()\n\nMDS session OPEN handling replaces mdsc->s_cap_auths under\nmdsc->mutex, freeing the previous array and its strings.\n\nceph_m…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: lock mutex in ceph_mds_check_access()\n\nMDS session OPEN handling replaces mdsc->s_cap_auths under\nmdsc->mutex, freeing the previous array and its strings.\n\nceph_m…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 596afb0b8933ba6ed7227adcc538db26feb25c74 < 729c1ff670ece6f3d4b1738365a0b2f90d487523","Linux >= 596afb0b8933ba6ed7227adcc538db26feb25c74 < ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3","Linux >= 596afb0b8933ba6ed7227adcc538db26feb25c74 < df1a97d5313fccadb08390306d49b194fb027392","Linux >= 596afb0b8933ba6ed7227adcc538db26feb25c74 < a61c6ae1dae2611082b831b4aaa780878099c012","Linux 6.10"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:22.800","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89990","references":[{"url":"https://git.kernel.org/stable/c/729c1ff670ece6f3d4b1738365a0b2f90d487523","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a61c6ae1dae2611082b831b4aaa780878099c012","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/df1a97d5313fccadb08390306d49b194fb027392","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.949Z","epss":0.00608,"epssPercentile":0.47776,"slug":"CVE-2026-89990","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nceph: lock mutex in ceph_mds_check_access()\n\nMDS session OPEN handling replaces mdsc->s_cap_auths under\nmdsc->mutex, freeing the previous array and its strings.\n\nceph_mds_check_access() traverses this array without holding the\nmutex.  A concurrent session reopen can therefore free the array while\nit is being inspected, resulting in a use-after-free like this:\n\n  Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9\n  [...]\n  Internal error: Oops: 0000000096000004 [#1]  SMP\n  Modules linked in:\n  CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE\n  [..]\n  pc : ceph_mds_check_access+0xd4/0x550\n  lr : ceph_mds_check_access+0xc8/0x550\n  [...]\n  Call trace:\n   ceph_mds_check_access+0xd4/0x550 (P)\n   ceph_atomic_open+0x138/0xbe8\n   path_openat+0xa24/0xfa8\n   do_filp_open+0x94/0x158\n   do_sys_openat2+0x88/0xf8\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":205053,"id":"CVE-2026-89990","ts":1789570704966,"field":"cvss","old":null,"new":"9.8"},{"seq":205052,"id":"CVE-2026-89990","ts":1789570704966,"field":"severity","old":"none","new":"critical"}]}