CVE-2026-89990
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Vulnerability report for CVE-2026-89990, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-16
Last updated on: 2026-09-16
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
ceph: lock mutex in ceph_mds_check_access()
MDS session OPEN handling replaces mdsc->s_cap_auths under
mdsc->mutex, 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
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
Currently, no data is known.
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
