CVE-2018-20961 — In the Linux kernel before 4

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-08-07T14:48:50.000Z
• Last modified: 2024-08-05T12:19:27.368Z

09References

• github.com — https://github.com/torvalds/linux/commit/7fafcfdf6377b18b2a726ea554d6e593ba44349…
• git.kernel.org — https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7fafc…
• cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.16.4
• seclists.org — https://seclists.org/bugtraq/2019/Aug/48
• packetstormsecurity.com — http://packetstormsecurity.com/files/154228/Slackware-Security-Advisory-Slackwar…
• support.f5.com — https://support.f5.com/csp/article/K58502654
• security.netapp.com — https://security.netapp.com/advisory/ntap-20190905-0002/
• usn.ubuntu.com — https://usn.ubuntu.com/4145-1/
• support.f5.com — https://support.f5.com/csp/article/K58502654?utm_source=f5support&amp%3Butm_medi…
• packetstormsecurity.com — http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LS…