CVE-2021-31440

moderate-risk
Published 2021-05-21

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.11.15. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-13661.

Do I need to act?

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0.67% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.0/10 High
LOCAL / HIGH complexity

Affected Products (10)

Affected Vendors

Linux Netapp

References (6)

Patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10...
Third Party Advisory https://security.netapp.com/advisory/ntap-20210706-0003/
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-503/
Patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=10...
Third Party Advisory https://security.netapp.com/advisory/ntap-20210706-0003/
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-503/
36
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 2/34 · Minimal
Exposure 16/34 · Moderate