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CVE-2021-22636: Texas Instruments TI-RTOS, when configured to use HeapMem heap(default), malloc returns a valid pointer

31
Routine
HIGH 7.4MITIGATEUPGRADEUPGRADE

CVE-2021-22636 is a high-severity flaw (CVSS 7.4) affecting real-time operating system, simplelink cc13xx software development kit, simplelink cc26xx software development kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Texas Instruments TI-RTOS, when configured to use HeapMem heap(default), malloc returns a valid pointer to a small buffer on extremely large values, which can trigger an integer overflow vulnerability in 'HeapMem_allocUnprotected' and result in code execution.

Why this priority

  • High severity

A fixed release or distro patch exists.

Risk facts

CVSS score7.4 (High)
Attack vectorLocal
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 80%)
CISA exploited listNo
WeaknessCWE-190
Published2023-11-20
Last modified2026-06-17
Publisher (CNA): ICS-CERT · Vendor: ti

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

ti real-time operating system MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ti simplelink cc13xx software development kit UPGRADE
Affected: < 4.40.00
Fixed in: 4.40.00
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy simplelink-cc13xx-software-development-kit || rpm -q simplelink-cc13xx-software-development-kit || simplelink-cc13xx-software-development-kit --version
2. UPGRADE to 4.40.00 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade simplelink-cc13xx-software-development-kit
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade simplelink-cc13xx-software-development-kit
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
ti simplelink cc26xx software development kit UPGRADE
Affected: < 4.40.00
Fixed in: 4.40.00
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy simplelink-cc26xx-software-development-kit || rpm -q simplelink-cc26xx-software-development-kit || simplelink-cc26xx-software-development-kit --version
2. UPGRADE to 4.40.00 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade simplelink-cc26xx-software-development-kit
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade simplelink-cc26xx-software-development-kit
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
ti simplelink cc32xx software development kit UPGRADE
Affected: < 4.10.03
Fixed in: 4.10.03
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy simplelink-cc32xx-software-development-kit || rpm -q simplelink-cc32xx-software-development-kit || simplelink-cc32xx-software-development-kit --version
2. UPGRADE to 4.10.03 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade simplelink-cc32xx-software-development-kit
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade simplelink-cc32xx-software-development-kit
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
ti simplelink msp432e401y MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy simplelink-msp432e401y || rpm -q simplelink-msp432e401y || simplelink-msp432e401y --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
ti simplelink msp432e411y MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy simplelink-msp432e411y || rpm -q simplelink-msp432e411y || simplelink-msp432e411y --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-22636?

real-time operating system: mitigate or apply the listed mitigation; simplelink cc13xx software development kit: upgrade to 4.40.00; simplelink cc26xx software development kit: upgrade to 4.40.00. Exact commands for each OS are on this page.

Is CVE-2021-22636 being exploited?

CVE-2021-22636 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-22636 affect?

CVE-2021-22636 affects real-time operating system, simplelink cc13xx software development kit, simplelink cc26xx software development kit. Severity is high (CVSS 7.4). Texas Instruments TI-RTOS, when configured to use HeapMem heap(default), malloc returns a valid pointer to a small buffer on extremely large values, which can trigger an integer overflow vulnerability in 'HeapMem_allocUnprotected' an

How urgent is CVE-2021-22636?

Priority 31/100. High severity

Related CVEs

References

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