CVE-2018-20961

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 6.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-08-07 · updated 2026-06-17
Weakness: CWE-415

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.

Affected products

Linux kernel: from 4.4 before 4.4.190; from 4.5 before 4.9.96; from 4.10 before 4.14.36; from 4.15.0 before 4.16.4 — fixed in 4.14.36, 4.16.4, 4.4.190, 4.9.96

How to fix

Upgrade to a fixed version: Linux kernel 4.14.36, 4.16.4, 4.4.190, 4.9.96. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/154228/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.16.4
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7fafcfdf6377b18b2a726ea554d6e593ba44349f
https://github.com/torvalds/linux/commit/7fafcfdf6377b18b2a726ea554d6e593ba44349f
https://seclists.org/bugtraq/2019/Aug/48
https://security.netapp.com/advisory/ntap-20190905-0002/
https://support.f5.com/csp/article/K58502654
https://support.f5.com/csp/article/K58502654?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/4145-1/
http://packetstormsecurity.com/files/154228/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html

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