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Vulnerability record · CVE-2026-46024 · published 27 May 2026

CVE-2026-46024: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

In 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.

7.5 CVSS 3.1 High EPSS 0.70% · top 48.7% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

In 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/016bc663657366d386993f63eb31072eb45a2b77 Patch
https://git.kernel.org/stable/c/4b2738b93edad661178340239de657d876b73d3d Patch
https://git.kernel.org/stable/c/5199c125d25aeae8615c4fc31652cc0fe624338e Patch
https://git.kernel.org/stable/c/8f2be7285941a33a9f72579a23b96392f83c758e Patch
https://git.kernel.org/stable/c/927e4bd5692f2a4901808822981fb2c8d4456548 Patch
https://git.kernel.org/stable/c/9ded62c302c0342efdb5eda3bf6e75720caad0df Patch
https://git.kernel.org/stable/c/f101271fcf55d7eacfefd610b51ec65f46ba8118 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46024), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.