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CVE

CVE-2026-89653

ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode
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CVE

CVE-2026-89653

ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode

In the Linux kernel, the following vulnerability has been resolved:

ceph: reject exporttargets ranks >= CEPHMAX_MDS in mdsmap decode

MDSMap exporttargets entries are monitor controlled. checknew_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 CEPHMAXMDS while decoding the map. Do not

validate against possiblemaxrank here because maps may legitimately

reference ranks beyond a temporarily reduced max_mds.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

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, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89653.json, https://nvd.nist.gov/vuln/detail/CVE-2026-89653, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00502%
EPSS Percentile
0.41055%
Introduced Version
d517b3983dd3106ca92d6c5d0d09415a4a09481c,5.15.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
aedc9053d909508a5f56c3f49f885fc030df4730,5.15.221,6.1.188,6.6.157,6.12.109,6.18.50,7.2.4,6.12.111-1~deb12u1,6.12.111-1,0:6.12.0-207.111.5.1.el10uek,0:6.12.0-207.111.5.1.el9uek

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