What’s Vulnerable › Vulnerabilities

CVE-2022-28736: There's a use-after-free vulnerability in grub_cmd_chainloader() function

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-20 · updated 2026-06-17
• Weakness: CWE-416

Description

There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2. When executing chainloader more than once a use-after-free vulnerability is triggered. If an attacker can control the GRUB2's memory allocation pattern sensitive data may be exposed and arbitrary code execution can be achieved.

Affected products

• grub2: from 2.00 before 2.06-3 — fixed in 2.06-3

How to fix

Upgrade to a fixed version: grub2 2.06-3. Check the vendor advisory for mitigations.

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28736
• https://security.netapp.com/advisory/ntap-20230825-0002/
• https://www.openwall.com/lists/oss-security/2022/06/07/5
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28736
• https://security.netapp.com/advisory/ntap-20230825-0002/
• https://www.openwall.com/lists/oss-security/2022/06/07/5

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