Null pointer dereference in Linux kernel - CVE-2018-13093

Vulnerability identifier: #VU13853

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-13093

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists in the lookup_slow() function in the Extended File System (XFS) component, as defined in the source code file fs/xfs/xfs_icache.c due to boundary error when mounting XFS filesystems. A local attacker can mount an XFS filesystem that submits malicious input, trigger NULL pointer dereference memory error and cause the affected software to terminate abnormally.

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Real Time for NFV
Ubuntu
Fedora

kernel (Red Hat package)
kernel-rt (Red Hat package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-powerpc64-smp-lts-xenial (Ubuntu package)
linux-image-powerpc64-emb-lts-xenial (Ubuntu package)
linux-image-powerpc-smp-lts-xenial (Ubuntu package)
linux-image-powerpc-e500mc-lts-xenial (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-generic-lpae-lts-xenial (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-powerpc-e500mc (Ubuntu package)
linux-image-powerpc-smp (Ubuntu package)
linux-image-powerpc64-emb (Ubuntu package)
linux-image-powerpc64-smp (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-4.4.0-201-generic-lpae (Ubuntu package)
linux-image-4.4.0-201-generic (Ubuntu package)
linux-image-4.4.0-201-lowlatency (Ubuntu package)
linux-image-4.4.0-201-powerpc-e500mc (Ubuntu package)
linux-image-4.4.0-201-powerpc-smp (Ubuntu package)
linux-image-4.4.0-201-powerpc64-emb (Ubuntu package)
linux-image-4.4.0-201-powerpc64-smp (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-4.4.0-1085-aws (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.4.0-1087-kvm (Ubuntu package)
linux-image-4.4.0-1121-aws (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.4.0-1145-raspi2 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.4.0-1149-snapdragon (Ubuntu package)
kernel
Red Hat Virtualization Host

Cybersecurity Help is currently unaware of any solutions addressing the vulnerability.

kernel (Red Hat package) - update to 3.10.0-1062.el7
kernel-rt (Red Hat package) - update to 3.10.0-1062.rt56.1022.el7
linux-image-generic-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-virtual-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-powerpc64-smp-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-powerpc64-emb-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-powerpc-smp-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-powerpc-e500mc-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-generic-lpae-lts-xenial (Ubuntu package) - update to 4.4.0.201.176
linux-image-lowlatency (Ubuntu package) - update to 4.4.0.201.207
linux-image-powerpc-e500mc (Ubuntu package) - update to 4.4.0.201.207
linux-image-powerpc-smp (Ubuntu package) - update to 4.4.0.201.207
linux-image-powerpc64-emb (Ubuntu package) - update to 4.4.0.201.207
linux-image-powerpc64-smp (Ubuntu package) - update to 4.4.0.201.207
linux-image-virtual (Ubuntu package) - update to 4.4.0.201.207
linux-image-generic (Ubuntu package) - update to 4.4.0.201.207
linux-image-generic-lpae (Ubuntu package) - update to 4.4.0.201.207
linux-image-4.4.0-201-generic-lpae (Ubuntu package) - update to 4.4.0-201.233~14.04.1
linux-image-4.4.0-201-generic (Ubuntu package) - update to 4.4.0-201.233~14.04.1
linux-image-4.4.0-201-lowlatency (Ubuntu package) - update to 4.4.0-201.233~14.04.1
linux-image-4.4.0-201-powerpc-e500mc (Ubuntu package) - update to 4.4.0-201.233~14.04.1
linux-image-4.4.0-201-powerpc-smp (Ubuntu package) - update to 4.4.0-201.233~14.04.1
linux-image-4.4.0-201-powerpc64-emb (Ubuntu package) - update to 4.4.0-201.233~14.04.1
linux-image-4.4.0-201-powerpc64-smp (Ubuntu package) - update to 4.4.0-201.233~14.04.1
linux-image-aws (Ubuntu package) - addressed in versions 4.4.0.1085.82, 4.4.0.1121.126
linux-image-4.4.0-1085-aws (Ubuntu package) - update to 4.4.0-1085.89
linux-image-kvm (Ubuntu package) - update to 4.4.0.1087.85
linux-image-4.4.0-1087-kvm (Ubuntu package) - update to 4.4.0-1087.96
linux-image-4.4.0-1121-aws (Ubuntu package) - update to 4.4.0-1121.135
linux-image-raspi2 (Ubuntu package) - update to 4.4.0.1145.145
linux-image-4.4.0-1145-raspi2 (Ubuntu package) - update to 4.4.0-1145.155
linux-image-snapdragon (Ubuntu package) - update to 4.4.0.1149.141
linux-image-4.4.0-1149-snapdragon (Ubuntu package) - update to 4.4.0-1149.159
kernel - addressed in versions 4.17.5-100.fc27, 4.17.5-200.fc28

• https://bugzilla.kernel.org/show_bug.cgi?id=199367

• Denial of service in Linux Kernel
• Amazon Linux AMI update for kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel
• Ubuntu update for linux
• Ubuntu update for linux-aws
• Fedora 28 update for kernel
• Fedora 27 update for kernel