Description
get_gate_page in mm/gup.c in the Linux kernel 5.7.x and 5.8.x before 5.8.7 allows privilege escalation because of incorrect reference counting (caused by gate page mishandling) of the struct page that backs the vsyscall page. The result is a refcount underflow. This can be triggered by any 64-bit process that can use ptrace() or process_vm_readv(), aka CID-9fa2dd946743.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
n/a n/a
n/aaffected
References
- https://www.openwall.com/lists/oss-security/2020/09/08/4 ↗
- https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2 ↗
- https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a ↗
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7 ↗
- http://www.openwall.com/lists/oss-security/2020/09/10/4 ↗
- https://security.netapp.com/advisory/ntap-20201001-0003/ ↗