Description

The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through 4.9.8 does not properly validate meta block groups, which allows physically proximate attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3a4b77cd47bb837b8557595ec7425f281f2ca1fe

http://seclists.org/fulldisclosure/2016/Nov/75

http://www.openwall.com/lists/oss-security/2017/02/05/3

http://www.securityfocus.com/bid/94354

https://access.redhat.com/errata/RHSA-2017:1297

https://access.redhat.com/errata/RHSA-2017:1298

https://access.redhat.com/errata/RHSA-2017:1308

https://bugzilla.redhat.com/show_bug.cgi?id=1395190

https://github.com/torvalds/linux/commit/3a4b77cd47bb837b8557595ec7425f281f2ca1fe

https://lists.debian.org/debian-lts-announce/2017/12/msg00004.html

https://usn.ubuntu.com/3754-1/

Details

Risk Information

CVSS v2

CVSS v3