What’s Vulnerable › Vulnerabilities

CVE-2021-43057

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-28 · updated 2026-06-17
• Weakness: CWE-416

Description

An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.

Affected products

• Linux kernel: from 5.13 before 5.14.8 — fixed in 5.14.8
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.14.8. Check the vendor advisory for mitigations.

References

• https://bugs.chromium.org/p/project-zero/issues/detail?id=2229
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.8
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3727a8bac0a9e77c70820655fd8715523ba3db7
• https://security.netapp.com/advisory/ntap-20211125-0001/
• https://bugs.chromium.org/p/project-zero/issues/detail?id=2229
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.8
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3727a8bac0a9e77c70820655fd8715523ba3db7
• https://security.netapp.com/advisory/ntap-20211125-0001/

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