Assigner | Linux |
Reserved | 2024-02-19 |
Published | 2024-04-03 |
Updated | 2024-05-29 |
Description
In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.
Product status
1da177e4c3f4 before 8180d0c27b93
1da177e4c3f4 before 70e329b44076
1da177e4c3f4 before f3f98d7d84b3
1da177e4c3f4 before ae20db45e482
1da177e4c3f4 before 7958c1bf5b03
1da177e4c3f4 before cda4672da1c2
5.10.210
5.15.149
6.1.79
6.6.18
6.7.6
6.8
References
https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214
https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77
https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139
https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7
https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc
https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html