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.

• linux linux kernel (>= 5.11 < 5.15.194) • linux linux kernel (>= 5.16 < 6.1.153) • linux linux kernel (>= 6.2 < 6.6.107) • linux linux kernel (>= 6.7 < 6.12.48) • linux linux kernel (>= 6.13 < 6.16.8) • linux linux kernel 6.17 • debian debian linux 11.0