CVE-2026-46119
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk40th percentile — higher than 40% of all known CVEs
Summary
A vulnerability in the Linux kernel related to out-of-bounds memory access in authentication message processing has been fixed. The issue occurred when a CEPH_MSG_AUTH_REPLY message contained a positive value in its result field, leading to improper processing and sending data beyond the allocated buffer.
Risk Assessment
Organizations may be exposed to unauthorized memory access, potentially leading to the disclosure of sensitive data or system instability. If exploited, an attacker could gain access to memory outside the allocated area.
Recommendation
It is recommended to update the Linux kernel to the latest version to eliminate this vulnerability. Additionally, monitoring and auditing systems for unauthorized memory access may help detect potential exploitation attempts.
Original NVD description (English source)
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.