CVE-2026-89653
ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 11, 2026 |
| Last Updated | Sep 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
d517b3983dd3106ca92d6c5d0d09415a4a09481c < 3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe d517b3983dd3106ca92d6c5d0d09415a4a09481c < 8c823bbab3c24e657469a84db96902ba82d4e8bb d517b3983dd3106ca92d6c5d0d09415a4a09481c < c4addccd05bacbef2144b4db14853d0308a218ac d517b3983dd3106ca92d6c5d0d09415a4a09481c < 736adee11af36e407ed902264f8b2fb5cf94b62f d517b3983dd3106ca92d6c5d0d09415a4a09481c < 4d298880f82c42383b36946bafde7ccf4d804c9b d517b3983dd3106ca92d6c5d0d09415a4a09481c < 96c3f5fbb0d5386e7111426f047f98cec4586674 d517b3983dd3106ca92d6c5d0d09415a4a09481c < aedc9053d909508a5f56c3f49f885fc030df4730
Linux / Linux
5.15
References
git.kernel.org: https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe git.kernel.org: https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb git.kernel.org: https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac git.kernel.org: https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f git.kernel.org: https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b git.kernel.org: https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674 git.kernel.org: https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730