CVE-2026-43407

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()

This patch fixes an out-of-bounds access in ceph_handle_auth_reply()

that can be triggered by a message of type CEPH_MSG_AUTH_REPLY. In

ceph_handle_auth_reply(), the value of the payload_len field of such a

message is stored in a variable of type int. A value greater than

INT_MAX leads to an integer overflow and is interpreted as a negative

value. This leads to decrementing the pointer address by this value and

subsequently accessing it because ceph_decode_need() only checks that

the memory access does not exceed the end address of the allocation.

This patch fixes the issue by changing the data type of payload_len to

u32. Additionally, the data type of result_msg_len is changed to u32,

as it is also a variable holding a non-negative length.

Also, an additional layer of sanity checks is introduced, ensuring that

directly after reading it from th

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References