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.

• Debian

  OS
  Debian
  11.0

• Linux Kernel

  OS
  Linux
  6.176.2 – 6.6.107 (excl.)5.11 – 5.15.194 (excl.)6.13 – 6.16.8 (excl.)6.7 – 6.12.48 (excl.)5.16 – 6.1.153 (excl.)