CVE-2023-40791 Information

Description

extract_user_to_sg in lib/scatterlist.c in the Linux kernel before 6.4.12 fails to unpin pages in a certain situation as demonstrated by a WARNING for try_grab_page.

Reference

https://lkml.org/lkml/2023/8/3/323 https://lore.kernel.org/linux-crypto/20571.1690369076@warthog.procyon.org.uk/ https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.12 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f443fd5af5dbd531f880d3645d5dd36976cf087f