Description

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.

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.3

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=17839856fd588f4ab6b789f482ed3ffd7c403e1f

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

Details

Risk Information

CVSS v2

CVSS v3