CVE-2026-52954
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.52% probability · 43th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-617
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3Patch
- https://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9daPatch
- https://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8Patch
- https://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519cPatch
- https://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905dPatch
- https://git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6cPatch
- https://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04dedPatch
- https://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9bPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.