CVE-2025-39880

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

libceph: fix invalid accesses to ceph_connection_v1_info

There is a place where generic code in messenger.c is reading and

another place where it is writing to con->v1 union member without

checking that the union member is active (i.e. msgr1 is in use).

On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter,

so such a read is almost guaranteed to return a bogus value instead of

0 when msgr2 is in use. This ends up being fairly benign because the

side effect is just the invalidation of the authorizer and successive

fetching of new tickets.

con->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that

it's being written to can cause more serious consequences, but luckily

it's not something that happens often.