CVE-2021-46993— sched: Fix out-of-bound access in uclamp
Possible ATT&CK Techniques 1AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 69842cba9ace84849bb9b8edcdf2cefccd97901c< 687f523c134b7f0bd040ee1230f6d17990d54172 | affected |
69842cba9ace84849bb9b8edcdf2cefccd97901c< f7347c85490b92dd144fa1fba9e1eca501656ab3 | affected | ||
69842cba9ace84849bb9b8edcdf2cefccd97901c< 3da3f804b82a0a382d523a21acf4cf3bb35f936d | affected | ||
69842cba9ace84849bb9b8edcdf2cefccd97901c< 42ee47c7e3569d9a0e2cb5053c496d97d380472f | affected | ||
69842cba9ace84849bb9b8edcdf2cefccd97901c< 6d2f8909a5fabb73fe2a63918117943986c39b6c | affected | ||
5.3 | affected | ||
< 5.3 | unaffected | ||
5.4.120≤ 5.4.* | unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2021-46993
Vulnerability Information
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Vulnerability Title
sched: Fix out-of-bound access in uclamp
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 uclamp 存在越界访问问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-46993
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-46993 (5)
Same Patch Batch · Linux · 2024-02-28 · 86 CVEs total
| CVE-2021-47013 | 9.8 CRITICAL | net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send |
| CVE-2021-46999 | 9.8 CRITICAL | sctp: do asoc update earlier in sctp_sf_do_dupcook_a |
| CVE-2021-47036 | 9.8 CRITICAL | udp: skip L4 aggregation for UDP tunnel packets |
| CVE-2021-47017 | 8.8 HIGH | ath10k: Fix a use after free in ath10k_htc_send_bundle |
| CVE-2021-47035 | 8.8 HIGH | iommu/vt-d: Remove WO permissions on second-level paging entries |
| CVE-2021-47049 | 8.4 HIGH | Drivers: hv: vmbus: Use after free in __vmbus_open() |
| CVE-2021-47014 | 7.8 HIGH | net/sched: act_ct: fix wild memory access when clearing fragments |
| CVE-2021-46998 | 7.8 HIGH | ethernet:enic: Fix a use after free bug in enic_hard_start_xmit |
| CVE-2021-47048 | 7.8 HIGH | spi: spi-zynqmp-gqspi: fix use-after-free in zynqmp_qspi_exec_op |
| CVE-2021-46992 | 7.8 HIGH | netfilter: nftables: avoid overflows in nft_hash_buckets() |
| CVE-2020-36785 | 7.8 HIGH | media: atomisp: Fix use after free in atomisp_alloc_css_stat_bufs() |
| CVE-2021-46984 | 7.8 HIGH | kyber: fix out of bounds access when preempted |
| CVE-2021-47040 | 7.8 HIGH | io_uring: fix overflows checks in provide buffers |
| CVE-2021-46977 | 7.8 HIGH | KVM: VMX: Disable preemption when probing user return MSRs |
| CVE-2021-47012 | 7.8 HIGH | RDMA/siw: Fix a use after free in siw_alloc_mr |
| CVE-2021-47011 | 7.8 HIGH | mm: memcontrol: slab: fix obtain a reference to a freeing memcg |
| CVE-2020-36787 | 7.8 HIGH | media: aspeed: fix clock handling logic |
| CVE-2021-47041 | 7.5 HIGH | nvmet-tcp: fix incorrect locking in state_change sk callback |
| CVE-2021-47001 | 7.5 HIGH | xprtrdma: Fix cwnd update ordering |
| CVE-2021-46983 | 7.5 HIGH | nvmet-rdma: Fix NULL deref when SEND is completed with error |
Showing top 20 of 86 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74733
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock - CVE-2026-74732
drm/amd/display: Check for tg ops in dce110_set_avmute - CVE-2026-74731
sched_ext: Skip sub-disable teardown for never-linked sub-sc - CVE-2026-74730
NFS: Pin the 'struct nfs_server' during a FREE_STATEID call - CVE-2026-74729
soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_
Same vendor: Linux
- CVE-2026-74733
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock - CVE-2026-74732
drm/amd/display: Check for tg ops in dce110_set_avmute - CVE-2026-74731
sched_ext: Skip sub-disable teardown for never-linked sub-sc - CVE-2026-74730
NFS: Pin the 'struct nfs_server' during a FREE_STATEID call - CVE-2026-74729
soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_
V. Comments for CVE-2021-46993
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