{"id":"CVE-2021-26706","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-26706","generatedAt":"2026-10-27T20:22:06.416Z","title":"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.","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.","published":"2022-01-24T01:15:08.000Z","lastModified":"2026-06-17T03:43:42.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-190"],"affected":["micrium/uc\\/lib"],"epss":{"score":0.01939,"percentile":0.79968,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://docs.silabs.com/micrium/latest/micrium-common/","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://micrium.atlassian.net/wiki/spaces/libdoc138/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04","tags":["Third Party Advisory","US Government Resource"],"source":"cve@mitre.org"},{"url":"https://docs.silabs.com/micrium/latest/micrium-common/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://micrium.atlassian.net/wiki/spaces/libdoc138/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-26706","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}