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CVE-2020-25221

Published: Sep 10, 2020

Modified: Aug 4, 2024

PUBLISHED

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.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

References

https://www.openwall.com/lists/oss-security/2020/09/08/4

x_refsource_MISC

https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2

x_refsource_MISC

https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a

x_refsource_MISC

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7

x_refsource_MISC

[oss-security] 20200910 Re: CVE Request: Linux kernel vsyscall page refcounting error

mailing-list

x_refsource_MLIST

https://security.netapp.com/advisory/ntap-20201001-0003/

x_refsource_CONFIRM

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