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.
The product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked.
| Link | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2020/09/08/4 | mailing list third party advisory patch |
| https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2 | issue tracking patch vendor advisory |
| https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a | issue tracking patch vendor advisory |
| https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7 | release notes vendor advisory |
| http://www.openwall.com/lists/oss-security/2020/09/10/4 | third party advisory mailing list |
| https://security.netapp.com/advisory/ntap-20201001-0003/ | third party advisory |