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CVE-2021-26706 Details

Description

An issue was discovered in lib_mem.c in Micrium uC/OS uC/LIB 1.38.x and 1.39.00. The following memory allocation functions do not check for integer overflow when allocating a pool whose size exceeds the address space: Mem_PoolCreate, Mem_DynPoolCreate, and Mem_DynPoolCreateHW. Because these functions use multiplication to calculate the pool sizes, the operation may cause an integer overflow if the arguments are large enough. The resulting memory pool will be smaller than expected and may be exploited by an attacker.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://docs.silabs.com/micrium/latest/micrium-common/	CVE	Vendor Advisory
https://micrium.atlassian.net/wiki/spaces/libdoc138/	CVE	Third Party Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04	CVE	Third Party AdvisoryUS Government Resource
https://docs.silabs.com/micrium/latest/micrium-common/	[email protected]	Vendor Advisory
https://micrium.atlassian.net/wiki/spaces/libdoc138/	[email protected]	Third Party Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04	[email protected]	Third Party AdvisoryUS Government Resource

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-190	Integer Overflow or Wraparound	[email protected]

Affected Products

Product	Versions
micrium uc/lib	1.38.00 1.38.01 1.38.02 1.38.03 1.38.04
CPE cpe:2.3:a:micrium:uc/lib:1.38.00:::::::* cpe:2.3:a:micrium:uc/lib:1.38.01:::::::* cpe:2.3:a:micrium:uc/lib:1.38.02:::::::* cpe:2.3:a:micrium:uc/lib:1.38.03:::::::* cpe:2.3:a:micrium:uc/lib:1.38.04:::::::* cpe:2.3:a:micrium:uc/lib:1.38.05:::::::* cpe:2.3:a:micrium:uc/lib:1.39.00:::::::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Feb 17, 2022	Initial Analysis	[email protected]