CVE-2026-68156
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.
How to fix
- Linux Linux2334e9997308305ee4fd508fdfe6086c4150ed60, 79a273df64238a4ade8b709689a78589f755b8ef, 26f814187abceee90dbb29a02133adb4786fbb13, 9d37aec9ffe4e743dabc3f84502e9723e17a30d4, 75e82e8944ac1efe9fdb88bd2f14d9a031282bdf, 0060ec912292a550198d8d18ac95b433c92a7091, 5ecfcd5c05866f185357700b81b461dae4f5ebb2, 937d61f86d377a3aa578adae7a3dfcecdddf9d89, 3.5, 3.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 2334e9997308305ee4fd508fdfe6086c4150ed60, 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 79a273df64238a4ade8b709689a78589f755b8ef, 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 26f814187abceee90dbb29a02133adb4786fbb13, 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 9d37aec9ffe4e743dabc3f84502e9723e17a30d4, 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 75e82e8944ac1efe9fdb88bd2f14d9a031282bdf, 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 0060ec912292a550198d8d18ac95b433c92a7091, 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 5ecfcd5c05866f185357700b81b461dae4f5ebb2, 0bed9b5c523d577378b6f83eab5835fe30c27208 ≤ v < 937d61f86d377a3aa578adae7a3dfcecdddf9d89, 29c65a277a64645af853e8c9a9b3dda0ddc421e0, d2c7223497cf8228416c70e3f4238ddd6c5bdf3c, 3.4.50 ≤ v < 3.5, 3.9.7 ≤ v < 3.10, 3.10 | 2334e9997308305ee4fd508fdfe6086c4150ed60, 79a273df64238a4ade8b709689a78589f755b8ef, 26f814187abceee90dbb29a02133adb4786fbb13, 9d37aec9ffe4e743dabc3f84502e9723e17a30d4, 75e82e8944ac1efe9fdb88bd2f14d9a031282bdf, 0060ec912292a550198d8d18ac95b433c92a7091, 5ecfcd5c05866f185357700b81b461dae4f5ebb2, 937d61f86d377a3aa578adae7a3dfcecdddf9d89, 3.5, 3.10 |
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