Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix race on rawdata dereference There is a race condition that leads to a use-after-free situation: because the rawdata inodes are not refcounted, an attacker can start open()ing one of the rawdata files, and at the same time remove the last reference to this rawdata (by removing the corresponding profile, for example), which frees its struct aa_loaddata; as a result, when seq_rawdata_open() is reached, i_private is a dangling pointer and freed memory is accessed. The rawdata inodes weren't refcounted to avoid a circular refcount and were supposed to be held by the profile rawdata reference. However during profile removal there is a window where the vfs and profile destruction race, resulting in the use after free. Fix this by moving to a double refcount scheme. Where the profile refcount on rawdata is used to break the circular dependency. Allowing for freeing of the rawdata once all inode references to the rawdata are put.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
5d5182cae40115c03933989473288e54afb39c7c to < 3b8e77c7abab40e6de9ad9de730d77984a498840affected5d5182cae40115c03933989473288e54afb39c7c to < d9d8560b9b7932f8cffc4c068c14289220900f79affected5d5182cae40115c03933989473288e54afb39c7c to < 6b6ba87579c7e7c669e0bec91823e7fb693bc5dfaffected5d5182cae40115c03933989473288e54afb39c7c to < 6ef1f2926c41ab96952d9696d55a052f1b3a9418affected5d5182cae40115c03933989473288e54afb39c7c to < f9761add6d100962a23996cb68f3d6abdd4d1815affected5d5182cae40115c03933989473288e54afb39c7c to < af782cc8871e3683ddd5a3cd2f7df526599863a9affected5d5182cae40115c03933989473288e54afb39c7c to < 763e838adc3c7ec5a7df2990ce84cad951e42721affected5d5182cae40115c03933989473288e54afb39c7c to < a0b7091c4de45a7325c8780e6934a894f92ac86baffected
Linux Linux
Default version status: affected
4.13affected0 to < 4.13unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.169 to ≤ 6.1.*unaffected6.6.130 to ≤ 6.6.*unaffected6.12.77 to ≤ 6.12.*unaffected6.18.18 to ≤ 6.18.*unaffected6.19.8 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/3b8e77c7abab40e6de9ad9de730d77984a498840 ↗
- https://git.kernel.org/stable/c/d9d8560b9b7932f8cffc4c068c14289220900f79 ↗
- https://git.kernel.org/stable/c/6b6ba87579c7e7c669e0bec91823e7fb693bc5df ↗
- https://git.kernel.org/stable/c/6ef1f2926c41ab96952d9696d55a052f1b3a9418 ↗
- https://git.kernel.org/stable/c/f9761add6d100962a23996cb68f3d6abdd4d1815 ↗
- https://git.kernel.org/stable/c/af782cc8871e3683ddd5a3cd2f7df526599863a9 ↗
- https://git.kernel.org/stable/c/763e838adc3c7ec5a7df2990ce84cad951e42721 ↗
- https://git.kernel.org/stable/c/a0b7091c4de45a7325c8780e6934a894f92ac86b ↗