GHSA-2RWM-P2MW-2GWH
Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-28 09:31In 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 ]
{
"affected": [],
"aliases": [
"CVE-2026-52954"
],
"database_specific": {
"cwe_ids": [
"CWE-617"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-24T17:17:05Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: handle rbtree insertion error in decode_choose_args()\n\nA message of type CEPH_MSG_OSD_MAP contains an OSD map that itself\ncontains a CRUSH map. The received CRUSH map may optionally contain\nchoose_args that get decoded in decode_choose_args(). In this function,\nnum_choose_arg_maps is read from the message, and a corresponding number\nof crush_choose_arg_maps gets decoded afterwards. Each\ncrush_choose_arg_map has a choose_args_index, which serves as the key\nwhen inserting it into the choose_args rbtree of the decoded crush_map.\nIf a (potentially corrupted) message contains two crush_choose_arg_maps\nwith the same index, the assertion in insert_choose_arg_map() triggers a\nkernel BUG when trying to insert the second crush_choose_arg_map.\n\nThis patch fixes the issue by switching to the non-asserting rbtree\ninsertion function and rejecting the message if the insertion fails.\n\n[ idryomov: changelog ]",
"id": "GHSA-2rwm-p2mw-2gwh",
"modified": "2026-06-28T09:31:37Z",
"published": "2026-06-24T18:32:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52954"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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