CVE-2021-46993

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Source
https://cve.org/CVERecord?id=CVE-2021-46993
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46993.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-46993
Downstream
Published
2024-02-28T09:15:37.880Z
Modified
2026-03-15T22:42:43.561732Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "5.3"
            },
            {
                "fixed": "5.4.120"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.5"
            },
            {
                "fixed": "5.10.38"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.11.22"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.12"
            },
            {
                "fixed": "5.12.5"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46993.json"