CVE-2018-14734 Use after free in n/a

High 7.8 Published 29 Jul 2018 Updated 5 Aug 2024

Attackers can cause a denial of service via a use-after-free vulnerability in the Linux kernel's InfiniBand core module.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2018-14734?

CVE-2018-14734 is a high-severity use after free vulnerability in Canonical Ubuntu Linux, published on 29 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

drivers/infiniband/core/ucma.c in the Linux kernel through 4.17.11 allows ucma_leave_multicast to access a certain data structure after a cleanup step in ucma_process_join, which allows attackers to cause a denial of service (use-after-free).

Weakness: CWE-416

Which versions are affected by CVE-2018-14734?

It affects 3 products.

Linux distribution packages (10)

`kgraft-patch-SLE12-SP3_Update_13` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`10-2.1`
`kgraft-patch-SLE12-SP3_Update_14` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`8-2.1`
`kgraft-patch-SLE12-SP3_Update_15` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`8-2.1`
`kernel-livepatch-SLE15_Update_0` SUSE:Linux Enterprise Live Patching 15	All versions	`10-28.1`
`kernel-livepatch-SLE15_Update_1` SUSE:Linux Enterprise Live Patching 15	All versions	`9-2.1`
`kgraft-patch-SLE12-SP1_Update_29` SUSE:Linux Enterprise Server 12 SP1-LTSS	All versions	`10-2.1`
`kgraft-patch-SLE12-SP2_Update_23` SUSE:Linux Enterprise Server 12 SP2-LTSS	All versions	`8-2.1`
`kgraft-patch-SLE12_Update_36` SUSE:Linux Enterprise Server 12-LTSS	All versions	`10-2.1`
`kgraft-patch-SLE12-SP1_Update_29` SUSE:Linux Enterprise Server for SAP Applications 12 SP1	All versions	`10-2.1`
`kgraft-patch-SLE12-SP2_Update_23` SUSE:Linux Enterprise Server for SAP Applications 12 SP2	All versions	`8-2.1`

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel.

How do I fix CVE-2018-14734?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-14734 being exploited?

There is no known exploitation of CVE-2018-14734 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2018-14734, GHSA-mw8q-cf75-7f35, SUSE-SU-2019:1422-1, SUSE-SU-2019:1437-1, SUSE-SU-2019:1489-1, UBUNTU-CVE-2018-14734.