CVE-2018-20961 Use after free in n/a

What is CVE-2018-20961?

CVE-2018-20961 is a critical use after free vulnerability in Linux kernel, published on 7 Aug 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel before 4.16.4, a double free vulnerability in the f_midi_set_alt function of drivers/usb/gadget/function/f_midi.c in the f_midi driver may allow attackers to cause a denial of service or possibly have unspecified other impact.

Weakness: CWE-415

Which versions are affected by CVE-2018-20961?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2018-20961?

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-2018-20961 being exploited?

There is no known exploitation of CVE-2018-20961 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-20961, GHSA-cfwf-8wx8-588c, UBUNTU-CVE-2018-20961.