CVE-2020-25221

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.

Weakness classification

• nvd@nist.gov: CWE-672

Primary references

• cve@mitre.org — Mailing List, Third Party Advisory
• cve@mitre.org — Release Notes, Vendor Advisory
• cve@mitre.org — Issue Tracking, Patch, Vendor Advisory
• cve@mitre.org — Issue Tracking, Patch, Vendor Advisory
• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Mailing List, Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Patch, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Patch, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Patch, Third Party Advisory