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.
Product status
cd1a677cad994021b19665ed476aea63f5d54f31 (git) before ea12ab684f8ae8a6da11a22c78d94a79e2163096
cd1a677cad994021b19665ed476aea63f5d54f31 (git) before 591ea9c30737663a471b2bb07b27ddde86b020d5
cd1a677cad994021b19665ed476aea63f5d54f31 (git) before 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8
cd1a677cad994021b19665ed476aea63f5d54f31 (git) before 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983
cd1a677cad994021b19665ed476aea63f5d54f31 (git) before 6bd8b56899be0b514945f639a89ccafb8f8dfaef
cd1a677cad994021b19665ed476aea63f5d54f31 (git) before cdbc9836c7afadad68f374791738f118263c5371
5.11
Any version before 5.11
5.15.194 (semver)
6.1.153 (semver)
6.6.107 (semver)
6.12.48 (semver)
6.16.8 (semver)
6.17 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/10/msg00008.html
git.kernel.org/...c/ea12ab684f8ae8a6da11a22c78d94a79e2163096
git.kernel.org/...c/591ea9c30737663a471b2bb07b27ddde86b020d5
git.kernel.org/...c/23538cfbeed87159a5ac6c61e7a6de3d8d4486a8
git.kernel.org/...c/35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983
git.kernel.org/...c/6bd8b56899be0b514945f639a89ccafb8f8dfaef
git.kernel.org/...c/cdbc9836c7afadad68f374791738f118263c5371
