CVE-2026-89653
Published: September 15, 2026Last modified: September 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode MDSMap export_targets entries are monitor controlled. check_new_map() uses each entry as a bit number in a fixed stack bitmap, so a rank outside the protocol namespace can make set_bit() write past the end of the array. Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not validate against possible_max_rank here because maps may legitimately reference ranks beyond a temporarily reduced max_mds.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Vulnerable (6.1.182-r0) |
| 25 LTS | linux-lts | Vulnerable (6.12.103-r0) | |
| Stream | linux-lts | Vulnerable (6.18.46-r0) |
References
- https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe
- https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b
- https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f
- https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb
- https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674
- https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730
- https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac