CVE-2021-4159

A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.

• CWE-202

• https://access.redhat.com/security/cve/CVE-2021-4159Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2036024Issue Tracking
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bdMailing List, Patch, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing List, Third Party Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-4159Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2021-4159Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2036024Issue Tracking
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bdMailing List, Patch, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlMailing List, Third Party Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-4159Third Party Advisory

Published

Aug 24, 2022

Last Modified

Jun 17, 2026

Status

Modified

• 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.

• CVE-2021-41584Gradle Enterprise before 2021.1.3 can allow unauthorized vie…7.5
• CVE-2021-41585Improper Input Validation vulnerability in accepting socket …7.5
• CVE-2021-41586In Gradle Enterprise before 2021.1.3, an attacker with the a…7.5
• CVE-2021-41587In Gradle Enterprise before 2021.1.3, an attacker with the a…7.5
• CVE-2021-41588In Gradle Enterprise before 2021.1.3, a crafted request can …8.1
• CVE-2021-41589In Gradle Enterprise before 2021.3 (and Enterprise Build Cac…9.8
• CVE-2021-41590In Gradle Enterprise through 2021.3, probing of the server-s…5.3
• CVE-2021-41591ACINQ Eclair before 0.6.3 allows loss of funds because of du…9.4
• CVE-2021-41592Blockstream c-lightning through 0.10.1 allows loss of funds …9.4
• CVE-2021-41593Lightning Labs lnd before 0.13.3-beta allows loss of funds b…8.6
• CVE-2021-41594In RSA Archer 6.9.SP1 P3, if some application functions are …6.5
• CVE-2021-41595SuiteCRM before 7.10.33 and 7.11.22 allows information discl…5.3