Description

The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 4.15.15 mishandles the case of a root directory with a zero i_links_count, which allows attackers to cause a denial of service (ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted ext4 image.

References

http://openwall.com/lists/oss-security/2018/03/29/1

https://access.redhat.com/errata/RHSA-2018:2948

https://access.redhat.com/errata/RHSA-2018:3083

https://access.redhat.com/errata/RHSA-2018:3096

https://bugzilla.kernel.org/show_bug.cgi?id=199179

https://bugzilla.kernel.org/show_bug.cgi?id=199275

https://bugzilla.redhat.com/show_bug.cgi?id=1560777

https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=8e4b5eae5decd9dfe5a4ee369c22028f90ab4c44

https://lists.debian.org/debian-lts-announce/2018/05/msg00000.html

https://usn.ubuntu.com/3676-1/

https://usn.ubuntu.com/3676-2/

https://usn.ubuntu.com/3677-1/

https://usn.ubuntu.com/3677-2/

https://usn.ubuntu.com/3678-1/

https://usn.ubuntu.com/3678-2/

https://usn.ubuntu.com/3678-3/

https://usn.ubuntu.com/3678-4/

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

https://www.debian.org/security/2018/dsa-4187

https://www.debian.org/security/2018/dsa-4188

Details

Risk Information

CVSS v2

CVSS v3