Answer in brief
CVE-2021-46993 records a High severity (CVSS 7.8) vulnerability in sched: Fix out-of-bound access in uclamp. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=69842cba9ace84849bb9b8edcdf2cefccd97901c <687f523c134b7f0bd040ee1230f6d17990d54172 || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <f7347c85490b92dd144fa1fba9e1eca501656ab3 || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <3da3f804b82a0a382d523a21acf4cf3bb35f936d || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <42ee47c7e3569d9a0e2cb5053c496d97d380472f || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <6d2f8909a5fabb73fe2a63918117943986c39b6c | 687f523c134b7f0bd040ee1230f6d17990d54172, f7347c85490b92dd144fa1fba9e1eca501656ab3, 3da3f804b82a0a382d523a21acf4cf3bb35f936d, 42ee47c7e3569d9a0e2cb5053c496d97d380472f, 6d2f8909a5fabb73fe2a63918117943986c39b6c |
| Linux/Linuxgeneric | 5.3 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-46993 records a High severity (CVSS 7.8) vulnerability in sched: Fix out-of-bound access in uclamp. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=69842cba9ace84849bb9b8edcdf2cefccd97901c <687f523c134b7f0bd040ee1230f6d17990d54172 || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <f7347c85490b92dd144fa1fba9e1eca501656ab3 || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <3da3f804b82a0a382d523a21acf4cf3bb35f936d || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <42ee47c7e3569d9a0e2cb5053c496d97d380472f || >=69842cba9ace84849bb9b8edcdf2cefccd97901c <6d2f8909a5fabb73fe2a63918117943986c39b6c | 687f523c134b7f0bd040ee1230f6d17990d54172, f7347c85490b92dd144fa1fba9e1eca501656ab3, 3da3f804b82a0a382d523a21acf4cf3bb35f936d, 42ee47c7e3569d9a0e2cb5053c496d97d380472f, 6d2f8909a5fabb73fe2a63918117943986c39b6c |
| Linux/Linuxgeneric | 5.3 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.