CVE-2018-1092 Information

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5