Description
In the Linux kernel, the following vulnerability has been resolved:
libceph: refresh auth->authorizer_buf{,_len} after authorizer update
ceph_x_create_authorizer() caches au->buf->vec.iov_base and au->buf->vec.iov_len in struct ceph_auth_handshake. These cached values are then used by the messenger connect code when sending the authorizer.
ceph_x_update_authorizer() can rebuild the authorizer when a newer service ticket is available. If the rebuilt authorizer no longer fits in the existing buffer, ceph_x_build_authorizer() drops its reference to au->buf and allocates a new one. If this is the final reference, ceph_buffer_put() frees the old ceph_buffer and its vec.iov_base, but auth->authorizer_buf still points at that freed memory.
A subsequent msgr1 reconnect can therefore queue the stale pointer and trigger a KASAN slab-use-after-free in _copy_from_iter() while tcp_sendmsg() copies the authorizer.
Refresh auth->authorizer_buf and auth->authorizer_buf_len after a successful authorizer rebuild so the messenger sends the current buffer.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 2334e9997308305ee4fd508fdfe6086c4150ed60; >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 79a273df64238a4ade8b709689a78589f755b8ef; >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 26f814187abceee90dbb29a02133adb4786fbb13; >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 9d37aec9ffe4e743dabc3f84502e9723e17a30d4; >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 75e82e8944ac1efe9fdb88bd2f14d9a031282bdf; >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 0060ec912292a550198d8d18ac95b433c92a7091; >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 5ecfcd5c05866f185357700b81b461dae4f5ebb2; >= 0bed9b5c523d577378b6f83eab5835fe30c27208, < 937d61f86d377a3aa578adae7a3dfcecdddf9d89; 29c65a277a64645af853e8c9a9b3dda0ddc421e0; d2c7223497cf8228416c70e3f4238ddd6c5bdf3c; >= 3.4.50, < 3.5; >= 3.9.7, < 3.10 |
| Linux | Linux | 3.10 |
References
- https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091
- https://git.kernel.org/stable/c/2334e9997308305ee4fd508fdfe6086c4150ed60
- https://git.kernel.org/stable/c/26f814187abceee90dbb29a02133adb4786fbb13
- https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2
- https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf
- https://git.kernel.org/stable/c/79a273df64238a4ade8b709689a78589f755b8ef
- https://git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89
- https://git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4
Timeline
- Published
- Aug 10, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received