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CVE-2026-89653

ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From d517b3983dd3106ca92d6c5d0d09415a4a09481c · fixed in 3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe; From d517b3983dd3106ca92d6c5d0d09415a4a09481c · fixed in 8c823bbab3c24e657469a84db96902ba82d4e8bb; From d517b3983dd3106ca92d6c5d0d09415a4a09481c · fixed in c4addccd05bacbef2144b4db14853d0308a218ac; From d517b3983dd3106ca92d6c5d0d09415a4a09481c · fixed in 736adee11af36e407ed902264f8b2fb5cf94b62f; From d517b3983dd3106ca92d6c5d0d09415a4a09481c · fixed in 4d298880f82c42383b36946bafde7ccf4d804c9b; From d517b3983dd3106ca92d6c5d0d09415a4a09481c · fixed in 96c3f5fbb0d5386e7111426f047f98cec4586674; From d517b3983dd3106ca92d6c5d0d09415a4a09481c · fixed in aedc9053d909508a5f56c3f49f885fc030df4730

  • Linux Linux

    5.15

  • KernelLinux

    From 5.15.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 7

git.kernel.org