CVE - CVE-2020-25221

CVE-ID
CVE-2020-25221	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://security.netapp.com/advisory/ntap-20201001-0003/ MISC:https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7 MISC:https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a MISC:https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2 MISC:https://www.openwall.com/lists/oss-security/2020/09/08/4 MLIST:[oss-security] 20200910 Re: CVE Request: Linux kernel vsyscall page refcounting error URL:http://www.openwall.com/lists/oss-security/2020/09/10/4
Assigning CNA
MITRE Corporation
Date Record Created
20200910	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20200910)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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