CVE-2020-36557
MEDIUMCVSS 5.1/10EPSS 0.19%
Last modified
CVE-2020-36557 is a medium-severity vulnerability rated 5.1/10 on the CVSS scale. A race condition in the Linux kernel before 5.6.2 between the VT_DISALLOCATE ioctl and closing/opening of ttys could lead to a use-after-free.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.
Description
A race condition in the Linux kernel before 5.6.2 between the VT_DISALLOCATE ioctl and closing/opening of ttys could lead to a use-after-free.
Metrics
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.6.2 |
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.2Patch, Release Notes, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca4463bf8438b403596edd0ec961ca0d4fbe0220Mailing List, Patch, Vendor Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.2Patch, Release Notes, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca4463bf8438b403596edd0ec961ca0d4fbe0220Mailing List, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-36557?
A race condition in the Linux kernel before 5.6.2 between the VT_DISALLOCATE ioctl and closing/opening of ttys could lead to a use-after-free.
How severe is CVE-2020-36557?
CVE-2020-36557 has a CVSS score of 5.1/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2020-36557?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Are you affected by CVE-2020-36557?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST