CVE-2021-46993
Last modified
CVE-2021-46993 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: sched: Fix out-of-bound access in uclamp Util-clamp places tasks in different buckets based on their clamp values for performance reasons. However, the size of buckets is currently computed using a rounding division, which can lead to an off-by-one error in some configurations. For instance, with 20 buckets, the bucket size will be 1024/20=51. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: sched: Fix out-of-bound access in uclamp Util-clamp places tasks in different buckets based on their clamp values for performance reasons. However, the size of buckets is currently computed using a rounding division, which can lead to an off-by-one error in some configurations. For instance, with 20 buckets, the bucket size will be 1024/20=51. A task with a clamp of 1024 will be mapped to bucket id 1024/51=20. Sadly, correct indexes are in range [0,19], hence leading to an out of bound memory access. Clamp the bucket id to fix the issue.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.3, < 5.4.120 |
| Linux | Linux Kernel | >= 5.5, < 5.10.38 |
| Linux | Linux Kernel | >= 5.11, < 5.11.22 |
| Linux | Linux Kernel | >= 5.12, < 5.12.5 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-46993?
How severe is CVE-2021-46993?
How do I fix CVE-2021-46993?
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.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-46987In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2021-46988In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2021-46989In the Linux kernel, the following vulnerability has been re…7.1
- CVE-2021-46990In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2021-46991In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2021-46992In the Linux kernel, the following vulnerability has been re…7.1
- CVE-2021-46994In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2021-46995In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2021-46996In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2021-46997In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2021-46998In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2021-46999In the Linux kernel, the following vulnerability has been re…7.8
Are you affected by CVE-2021-46993?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST