CVE-2021-3743
HIGHCVSS 7.1/10EPSS 0.73%
Last modified
CVE-2021-3743 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel. A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. EPSS estimates a 0.73% chance of exploitation in the next 30 days.
Description
An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel. A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | > 5.14.1, < 5.17 | — |
| Linux | Linux Kernel | 5.14 | Rc6 |
| Linux | Linux Kernel | 5.17 | — |
| Fedoraproject | Fedora | 34 | — |
| Netapp | H300s Firmware | All versions | — |
| Netapp | H500s Firmware | All versions | — |
| Netapp | H700s Firmware | All versions | — |
| Netapp | H300e Firmware | All versions | — |
| Netapp | H500e Firmware | All versions | — |
| Netapp | H700e Firmware | All versions | — |
| Netapp | H410s Firmware | All versions | — |
| Netapp | H410c Firmware | All versions | — |
| Oracle | Communications Cloud Native Core Binding Support Function | 22.1.3 | — |
| Oracle | Communications Cloud Native Core Network Exposure Function | 22.1.1 | — |
| Oracle | Communications Cloud Native Core Policy | 22.2.0 | — |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1997961Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e78c597c3ebPatch, Vendor Advisory
- https://github.com/torvalds/linux/commit/7e78c597c3ebfd0cb329aa09a838734147e4f117Patch, Third Party Advisory
- https://lists.openwall.net/netdev/2021/08/17/124Exploit, Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220407-0007/Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/08/27/2Exploit, Mailing List, Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1997961Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e78c597c3ebPatch, Vendor Advisory
- https://github.com/torvalds/linux/commit/7e78c597c3ebfd0cb329aa09a838734147e4f117Patch, Third Party Advisory
- https://lists.openwall.net/netdev/2021/08/17/124Exploit, Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220407-0007/Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/08/27/2Exploit, Mailing List, Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3743?
An out-of-bounds (OOB) memory read flaw was found in the Qualcomm IPC router protocol in the Linux kernel. A missing sanity check allows a local attacker to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.
How severe is CVE-2021-3743?
CVE-2021-3743 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3743?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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