An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c. The get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access, aka CID-17839856fd58.
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.3
https://bugs.chromium.org/p/project-zero/issues/detail?id=2045
https://security.netapp.com/advisory/ntap-20210115-0002/
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
https://www.debian.org/security/2022/dsa-5096
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
Source: MITRE
Published: 2020-11-28
Updated: 2022-04-19
Type: CWE-362
Base Score: 3.3
Vector: AV:L/AC:M/Au:N/C:P/I:P/A:N
Impact Score: 4.9
Exploitability Score: 3.4
Severity: LOW
Base Score: 3.6
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Impact Score: 2.5
Exploitability Score: 1
Severity: LOW