CVE-2025-39880
Description
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.
How to fix
- linux linux_kernel5.15.194, 6.1.153, 6.6.107, 6.12.48, 6.16.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.11 ≤ v < 5.15.194, 5.16 ≤ v < 6.1.153, 6.2 ≤ v < 6.6.107, 6.7 ≤ v < 6.12.48, 6.13 ≤ v < 6.16.8, 6.17 | 5.15.194, 6.1.153, 6.6.107, 6.12.48, 6.16.8 |
| debian debian_linux | 11.0 | — |
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