High 7.5Published Jun 24, 2026

CVE-2026-52954libceph: handle rbtree insertion error in decode_choose_args()

Updated under an hour ago (Oct 28, 2026, 5:40 AM ET)

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Exploited in the last 30 days

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 ]

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5cf9c4a9959b6273675310d14a834ef14fbca37c before c7bf7864e2924fa5508ac270b0e9364bc13d5a6c; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before f47430fc1f815e87406e2d3b4e476eff1bc7fd9b; 5cf9c4a9959b6273675310d14a834ef14fbca37c builds before 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before 534ebc08df97c47d4c7596f336fa31ecbf91519c; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before 80c73bd1b2b04355d1d0c29be8ccbd25a380905d; 5cf9c4a9959b6273675310d14a834ef14fbca37c builds before 4d2b37abda9536808655830d683dc491d31741a8; 5cf9c4a9959b6273675310d14a834ef14fbca37c builds before 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before d289478cfc0bcf81c7914200d6abdcb78bd04ded	CNA record
linux linux_kernel linux:linux_kernel	from 4.13 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6c	patch
https://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b	patch
https://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da	patch
https://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c	patch
https://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d	patch
https://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8	patch
https://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3	patch
https://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.