GHSA-FMW3-M5FG-W74X
Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-06-01 18:31In the Linux kernel, the following vulnerability has been resolved:
libceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()
If a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both protocol and result, this is currently not treated as an error. In case of ac->negotiating == true and ac->protocol > 0, this leads to setting ac->protocol = 0 and ac->ops = NULL. Thereafter, the check for ac->protocol != protocol returns false, and init_protocol() is not called. Subsequently, ac->ops->handle_reply() is called, which leads to a null pointer dereference, because ac->ops is still NULL.
This patch changes the check for ac->protocol != protocol to !ac->protocol, as this also includes the case when the protocol was set to zero in the message. This causes the message to be treated as containing a bad auth protocol.
{
"affected": [],
"aliases": [
"CVE-2026-46024"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-27T14:17:20Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Prevent potential null-ptr-deref in ceph_handle_auth_reply()\n\nIf a message of type CEPH_MSG_AUTH_REPLY contains a zero value for both\nprotocol and result, this is currently not treated as an error. In case\nof ac-\u003enegotiating == true and ac-\u003eprotocol \u003e 0, this leads to setting\nac-\u003eprotocol = 0 and ac-\u003eops = NULL. Thereafter, the check for\nac-\u003eprotocol != protocol returns false, and init_protocol() is not\ncalled. Subsequently, ac-\u003eops-\u003ehandle_reply() is called, which leads to\na null pointer dereference, because ac-\u003eops is still NULL.\n\nThis patch changes the check for ac-\u003eprotocol != protocol to\n!ac-\u003eprotocol, as this also includes the case when the protocol was set\nto zero in the message. This causes the message to be treated as\ncontaining a bad auth protocol.",
"id": "GHSA-fmw3-m5fg-w74x",
"modified": "2026-06-01T18:31:34Z",
"published": "2026-05-27T15:33:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46024"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ded62c302c0342efdb5eda3bf6e75720caad0df"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f101271fcf55d7eacfefd610b51ec65f46ba8118"
}
],
"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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