Null pointer dereference in Linux kernel - CVE-2018-13095

Vulnerability identifier: #VU13851

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-2018-13095

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

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Power, little endian
Ubuntu
Fedora

kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-generic-lpae-lts-xenial (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-powerpc-e500mc (Ubuntu package)
linux-image-powerpc-smp (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-powerpc64-emb (Ubuntu package)
linux-image-powerpc64-smp (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-4.4.0-208-powerpc64-smp (Ubuntu package)
linux-image-4.4.0-208-powerpc-e500mc (Ubuntu package)
linux-image-4.4.0-208-powerpc64-emb (Ubuntu package)
linux-image-4.4.0-208-powerpc-smp (Ubuntu package)
linux-image-4.4.0-208-lowlatency (Ubuntu package)
linux-image-4.4.0-208-generic-lpae (Ubuntu package)
linux-image-4.4.0-208-generic (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-4.4.0-1090-aws (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.4.0-1091-kvm (Ubuntu package)
linux-image-4.4.0-1126-aws (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.4.0-1150-raspi2 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.4.0-1154-snapdragon (Ubuntu package)
linux-image-4.15.0-141-lowlatency (Ubuntu package)
linux-image-4.15.0-141-generic-lpae (Ubuntu package)
linux-image-4.15.0-141-generic (Ubuntu package)
linux-image-dell300x (Ubuntu package)
linux-image-4.15.0-1016-dell300x (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-4.15.0-1069-oracle (Ubuntu package)
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1083-raspi2 (Ubuntu package)
linux-image-4.15.0-1089-kvm (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-4.15.0-1097-gcp (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
linux-image-aws-hwe (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1098-aws (Ubuntu package)
linux-image-4.15.0-1100-snapdragon (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1112-azure (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
kernel-alt (Red Hat package) - update to 4.14.0-115.8.1.el7a
linux-image-virtual-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-generic-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-generic-lpae-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-generic (Ubuntu package) - addressed in versions 4.4.0.208.214, 4.15.0.141.128
linux-image-lowlatency (Ubuntu package) - addressed in versions 4.4.0.208.214, 4.15.0.141.128
linux-image-powerpc-e500mc (Ubuntu package) - update to 4.4.0.208.214
linux-image-powerpc-smp (Ubuntu package) - update to 4.4.0.208.214
linux-image-generic-lpae (Ubuntu package) - addressed in versions 4.4.0.208.214, 4.15.0.141.128
linux-image-powerpc64-emb (Ubuntu package) - update to 4.4.0.208.214
linux-image-powerpc64-smp (Ubuntu package) - update to 4.4.0.208.214
linux-image-virtual (Ubuntu package) - addressed in versions 4.4.0.208.214, 4.15.0.141.128
linux-image-4.4.0-208-powerpc64-smp (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-powerpc-e500mc (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-powerpc64-emb (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-powerpc-smp (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-lowlatency (Ubuntu package) - update to 4.4.0-208.240~14.04.1
linux-image-4.4.0-208-generic-lpae (Ubuntu package) - update to 4.4.0-208.240~14.04.1
linux-image-4.4.0-208-generic (Ubuntu package) - update to 4.4.0-208.240~14.04.1
linux-image-aws (Ubuntu package) - addressed in versions 4.4.0.1090.87, 4.4.0.1126.131
linux-image-4.4.0-1090-aws (Ubuntu package) - update to 4.4.0-1090.94
linux-image-kvm (Ubuntu package) - addressed in versions 4.4.0.1091.89, 4.15.0.1089.85
linux-image-4.4.0-1091-kvm (Ubuntu package) - update to 4.4.0-1091.100
linux-image-4.4.0-1126-aws (Ubuntu package) - update to 4.4.0-1126.140
linux-image-raspi2 (Ubuntu package) - addressed in versions 4.4.0.1150.150, 4.15.0.1083.80
linux-image-4.4.0-1150-raspi2 (Ubuntu package) - update to 4.4.0-1150.161
linux-image-snapdragon (Ubuntu package) - addressed in versions 4.4.0.1154.146, 4.15.0.1100.103
linux-image-4.4.0-1154-snapdragon (Ubuntu package) - update to 4.4.0-1154.164
linux-image-4.15.0-141-lowlatency (Ubuntu package) - update to 4.15.0-141.145
linux-image-4.15.0-141-generic-lpae (Ubuntu package) - update to 4.15.0-141.145
linux-image-4.15.0-141-generic (Ubuntu package) - update to 4.15.0-141.145
linux-image-dell300x (Ubuntu package) - update to 4.15.0.1016.18
linux-image-4.15.0-1016-dell300x (Ubuntu package) - update to 4.15.0-1016.20
linux-image-oracle (Ubuntu package) - update to 4.15.0.1069.57
linux-image-4.15.0-1069-oracle (Ubuntu package) - addressed in versions 4.15.0-1069.77, 4.15.0-1069.77~16.04.1
linux-image-oracle-lts-18.04 (Ubuntu package) - update to 4.15.0.1069.79
linux-image-4.15.0-1083-raspi2 (Ubuntu package) - update to 4.15.0-1083.88
linux-image-4.15.0-1089-kvm (Ubuntu package) - update to 4.15.0-1089.91
linux-image-gcp (Ubuntu package) - update to 4.15.0.1097.98
linux-image-gke (Ubuntu package) - update to 4.15.0.1097.98
linux-image-4.15.0-1097-gcp (Ubuntu package) - addressed in versions 4.15.0-1097.110, 4.15.0-1097.110~16.04.1
linux-image-gcp-lts-18.04 (Ubuntu package) - update to 4.15.0.1097.115
linux-image-aws-hwe (Ubuntu package) - update to 4.15.0.1098.91
linux-image-aws-lts-18.04 (Ubuntu package) - update to 4.15.0.1098.101
linux-image-4.15.0-1098-aws (Ubuntu package) - update to 4.15.0-1098.105~16.04.1
linux-image-4.15.0-1100-snapdragon (Ubuntu package) - update to 4.15.0-1100.109
linux-image-azure (Ubuntu package) - addressed in versions 4.15.0.1112.85, 4.15.0.1112.103
linux-image-azure-lts-18.04 (Ubuntu package) - update to 4.15.0.1112.85
linux-image-4.15.0-1112-azure (Ubuntu package) - addressed in versions 4.15.0-1112.124~14.04.1, 4.15.0-1112.124~16.04.1, 4.15.0-1112.125
kernel - addressed in versions 4.17.5-100.fc27, 4.17.5-200.fc28

• https://bugzilla.kernel.org/show_bug.cgi?id=199915

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