Description

The mm subsystem in the Linux kernel through 3.2 does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism, which allows local users to read or write to kernel memory locations in the first megabyte (and bypass slab-allocation access restrictions) via an application that opens the /dev/mem file, related to arch/x86/mm/init.c and drivers/char/mem.c.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a4866aa812518ed1a37d8ea0c881dc946409de94

http://www.debian.org/security/2017/dsa-3945

http://www.openwall.com/lists/oss-security/2017/04/16/4

http://www.securityfocus.com/bid/97690

https://access.redhat.com/errata/RHSA-2017:1842

https://access.redhat.com/errata/RHSA-2017:2077

https://access.redhat.com/errata/RHSA-2017:2669

https://access.redhat.com/errata/RHSA-2018:1854

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=b8f254aa17f720053054c4ecff3920973a83b9d6

https://github.com/torvalds/linux/commit/a4866aa812518ed1a37d8ea0c881dc946409de94

https://usn.ubuntu.com/3583-1/

https://usn.ubuntu.com/3583-2/

Details

Risk Information

CVSS v2

CVSS v3