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CVE-2026-52954

libceph: handle rbtree insertion error in decode_choose_args()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in c7bf7864e2924fa5508ac270b0e9364bc13d5a6c; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in f47430fc1f815e87406e2d3b4e476eff1bc7fd9b; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 534ebc08df97c47d4c7596f336fa31ecbf91519c; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 80c73bd1b2b04355d1d0c29be8ccbd25a380905d; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 4d2b37abda9536808655830d683dc491d31741a8; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3; From 5cf9c4a9959b6273675310d14a834ef14fbca37c · fixed in d289478cfc0bcf81c7914200d6abdcb78bd04ded

  • Linux Linux

    4.13

  • KernelLinux

    From 4.13.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.141; From 6.7.0 · fixed in 6.12.91; From 6.13.0 · fixed in 6.18.33; From 6.19.0 · fixed in 7.0.10

References 8

git.kernel.org