CVE-2020-25221

moderate-risk
Published 2020-09-10

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.

Do I need to act?

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0.19% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / LOW complexity

Affected Products (6)

Affected Vendors

Linux Netapp

References (12)

Mailing List http://www.openwall.com/lists/oss-security/2020/09/10/4
Release Notes https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7
Issue Tracking https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a
Issue Tracking https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2
Third Party Advisory https://security.netapp.com/advisory/ntap-20201001-0003/
Mailing List https://www.openwall.com/lists/oss-security/2020/09/08/4
Mailing List http://www.openwall.com/lists/oss-security/2020/09/10/4
Release Notes https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7
Issue Tracking https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a
Issue Tracking https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2
Third Party Advisory https://security.netapp.com/advisory/ntap-20201001-0003/
Mailing List https://www.openwall.com/lists/oss-security/2020/09/08/4
38
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 1/34 · Minimal
Exposure 13/34 · Low