Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-05-28T00:00:00 kernel: libceph: Fix slab-out-of-bounds access in auth message processing 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-131

In the Linux kernel, the following vulnerability has been resolved: libceph: Fix slab-out-of-bounds access in auth message processing If a (potentially corrupted) message of type CEPH_MSG_AUTH_REPLY contains a positive value in its result field, it is treated as an error code by ceph_handle_auth_reply() and returned to handle_auth_reply(). Thereafter, an attempt is made to send the preallocated message of type CEPH_MSG_AUTH, where the returned value is interpreted as the size of the front segment to send. If the result value in the message is greater than the size of the memory buffer allocated for the front segment, an out-of-bounds access occurs, and the content of the memory region beyond this buffer is sent out. This patch fixes the issue by treating only negative values in the result field as errors. Positive values are therefore treated as success in the same way as a zero value. Additionally, a BUG_ON is added to __send_prepared_auth_request() comparing the len parameter to front_alloc_len to prevent sending the message if it exceeds the bounds of the allocation and to make it easier to catch any logic flaws leading to this.

A flaw was found in the Linux kernel's libceph component. A remote attacker could exploit this vulnerability by sending a specially crafted CEPH_MSG_AUTH_REPLY message. When the message's result field contains a positive value, it can be misinterpreted as a buffer size, leading to a slab-out-of-bounds read. This allows the attacker to disclose sensitive information from memory beyond the intended buffer.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Affected kernel Red Hat Enterprise Linux 7 Affected kernel-rt Red Hat Enterprise Linux 8 Affected kernel Red Hat Enterprise Linux 8 Affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-46119 https://nvd.nist.gov/vuln/detail/CVE-2026-46119 https://lore.kernel.org/linux-cve-announce/2026052814-CVE-2026-46119-13b0@gregkh/T