Description
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.
References (4)
Core 4
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5
Patch, Vendor Advisory x_refsource_misc
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040
Exploit, Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugs.chromium.org/p/project-zero/issues/detail?id=2045
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210108-0002/
Scores
CVSS v3
7.0
EPSS
0.0010
EPSS Percentile
27.5%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-362
Status
published
Products (7)
linux/linux_kernel
4.5.5 - 4.9.228
netapp/cloud_backup
netapp/element_software
netapp/h410c_firmware
netapp/hci_bootstrap_os
netapp/hci_management_node
netapp/solidfire
Published
Nov 28, 2020
Tracked Since
Feb 18, 2026