CVE-2021-46993
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
sched: Fix out-of-bound access in uclamp
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 69842cba9ace84849bb9b8edcdf2cefccd97901c | affected | git | 687f523c134b7f0bd040ee1230f6d17990d54172 | Unavailable | None listed |
| 69842cba9ace84849bb9b8edcdf2cefccd97901c | affected | git | f7347c85490b92dd144fa1fba9e1eca501656ab3 | Unavailable | None listed |
| 69842cba9ace84849bb9b8edcdf2cefccd97901c | affected | git | 3da3f804b82a0a382d523a21acf4cf3bb35f936d | Unavailable | None listed |
| 69842cba9ace84849bb9b8edcdf2cefccd97901c | affected | git | 42ee47c7e3569d9a0e2cb5053c496d97d380472f | Unavailable | None listed |
| 69842cba9ace84849bb9b8edcdf2cefccd97901c | affected | git | 6d2f8909a5fabb73fe2a63918117943986c39b6c | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.3 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.3 | Unavailable | None listed |
| 5.4.120 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.38 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.11.22 | unaffected | semver | Unavailable | 5.11.* | None listed |
| 5.12.5 | unaffected | semver | Unavailable | 5.12.* | None listed |
| 5.13 | unaffected | original_commit_for_fix | Unavailable | * | None listed |