High severity7.8NVD Advisory· Published Sep 10, 2020· Updated Jun 17, 2026
CVE-2020-25221
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.
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Affected products
2- Linux/Linux kerneldescription
Patches
Vulnerability mechanics
References
4- www.openwall.com/lists/oss-security/2020/09/08/4nvdMailing ListPatchThird Party Advisory
- www.openwall.com/lists/oss-security/2020/09/10/4nvdMailing ListThird Party Advisory
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7nvdRelease NotesVendor Advisory
- security.netapp.com/advisory/ntap-20201001-0003/nvdThird Party Advisory
News mentions
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