CVE-2017-18075 Use after free in n/a

High 7.8 Published 24 Jan 2018 Updated 5 Aug 2024

A local user can cause a denial of service in the Linux kernel via a use-after-free in the pcrypt module, requiring specific crypto API configurations.

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-2017-18075?

CVE-2017-18075 is a high-severity use after free vulnerability in Canonical Ubuntu Linux, published on 24 Jan 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

crypto/pcrypt.c in the Linux kernel before 4.14.13 mishandles freeing instances, allowing a local user able to access the AF_ALG-based AEAD interface (CONFIG_CRYPTO_USER_API_AEAD) and pcrypt (CONFIG_CRYPTO_PCRYPT) to cause a denial of service (kfree of an incorrect pointer) or possibly have unspecified other impact by executing a crafted sequence of system calls.

Weakness: CWE-763

Which versions are affected by CVE-2017-18075?

It affects 2 products.

Linux distribution packages (20)

`kgraft-patch-SLE12-SP2_Update_10` SUSE:Linux Enterprise Live Patching 12	All versions	`8-2.1`
`kgraft-patch-SLE12-SP2_Update_11` SUSE:Linux Enterprise Live Patching 12	All versions	`7-2.1`
`kgraft-patch-SLE12-SP2_Update_12` SUSE:Linux Enterprise Live Patching 12	All versions	`7-2.1`
`kgraft-patch-SLE12-SP2_Update_13` SUSE:Linux Enterprise Live Patching 12	All versions	`6-2.1`
`kgraft-patch-SLE12-SP2_Update_14` SUSE:Linux Enterprise Live Patching 12	All versions	`4-2.1`
`kgraft-patch-SLE12-SP2_Update_15` SUSE:Linux Enterprise Live Patching 12	All versions	`4-2.1`
`kgraft-patch-SLE12-SP2_Update_16` SUSE:Linux Enterprise Live Patching 12	All versions	`3-2.1`
`kgraft-patch-SLE12-SP2_Update_17` SUSE:Linux Enterprise Live Patching 12	All versions	`3-2.1`
`kgraft-patch-SLE12-SP2_Update_5` SUSE:Linux Enterprise Live Patching 12	All versions	`11-2.1`
`kgraft-patch-SLE12-SP2_Update_6` SUSE:Linux Enterprise Live Patching 12	All versions	`10-2.1`
`kgraft-patch-SLE12-SP2_Update_7` SUSE:Linux Enterprise Live Patching 12	All versions	`9-2.1`
`kgraft-patch-SLE12-SP2_Update_8` SUSE:Linux Enterprise Live Patching 12	All versions	`9-2.1`
`kgraft-patch-SLE12-SP2_Update_9` SUSE:Linux Enterprise Live Patching 12	All versions	`8-2.1`
`kgraft-patch-SLE12-SP3_Update_1` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`6-2.1`
`kgraft-patch-SLE12-SP3_Update_2` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`5-2.1`
`kgraft-patch-SLE12-SP3_Update_3` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`5-2.1`
`kgraft-patch-SLE12-SP3_Update_4` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`4-2.1`
`kgraft-patch-SLE12-SP3_Update_5` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`3-2.1`
`kgraft-patch-SLE12-SP3_Update_6` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`3-2.1`
`kgraft-patch-SLE12-SP3_Update_7` SUSE:Linux Enterprise Live Patching 12 SP3	All versions	`3-2.1`

Products include Canonical Ubuntu Linux, Linux kernel.

How do I fix CVE-2017-18075?

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-2017-18075 being exploited?

There is no known exploitation of CVE-2017-18075 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2017-18075, GHSA-jgvv-ggg2-4ww6, SUSE-SU-2018:0568-1, SUSE-SU-2018:0572-1, SUSE-SU-2018:0573-1, SUSE-SU-2018:0574-1 and 17 more.