In the Linux kernel, the following vulnerability has been resolved:
apparmor: check label build before no_new_privs test
aa_change_profile() builds a replacement label with fn_label_build_in_scope() before the no_new_privs subset check. The build helper can fail and return NULL or an ERR_PTR, but the result was passed to aa_label_is_unconfined_subset() before the existing IS_ERR_OR_NULL() check.
Reuse the existing target-label build failure handling immediately after the build. This preserves the current audit handling while preventing the subset helper from dereferencing an invalid label.
References
- https://git.kernel.org/stable/c/31cb109db5e6322ed22304fd5c0dedbaa438d6d3
- https://git.kernel.org/stable/c/a29f06db44b4c94597ded58f639eed3e21781ac3
- https://git.kernel.org/stable/c/a58cafd38b46fb1a2220e2fbbcfe291ea75fa147
- https://git.kernel.org/stable/c/b7c45c05a396a017c49ac7949de240a0dfc0ac4e
- https://git.kernel.org/stable/c/cfc224866530a6842b6c2d2d30ef6a9b0e64bb9c
- https://git.kernel.org/stable/c/d82160132345688a09cbaa648cfdd16bb32e8ea2
- https://git.kernel.org/stable/c/d84bb195d208adbf77f012ca2a96e11163f6def1
- https://git.kernel.org/stable/c/ec926b2a351eeeb31e6c9aee02e0c32f94b5588f