CVE-2026-68156

Status: UPDATED  |  Advisory ID: CVE-2026-68156

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

libceph: refresh auth->authorizer_buf{,_len} after authorizer update

ceph_x_create_authorizer() caches au->buf->vec.iov_base and

au->buf->vec.iov_len in struct ceph_auth_handshake. These

cached values are then used by the messenger connect code when

sending the authorizer.

ceph_x_update_authorizer() can rebuild the authorizer when a newer

service ticket is available. If the rebuilt authorizer no longer

fits in the existing buffer, ceph_x_build_authorizer() drops its

reference to au->buf and allocates a new one. If this is the final

reference, ceph_buffer_put() frees the old ceph_buffer and its

vec.iov_base, but auth->authorizer_buf still points at that freed

memory.

A subsequent msgr1 reconnect can therefore queue the stale pointer

and trigger a KASAN slab-use-after-free in _copy_from_iter() while

tcp_sendmsg() copies the authorizer.

Refresh auth->authorizer_buf and auth->authorizer_buf_len after a

successful authorizer rebuild so the messenger sends the current

buffer. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References