What’s Vulnerable › Vulnerabilities

CVE-2022-28733: Integer underflow in grub_net_recv_ip4_packets

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% 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-191

Description

Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the total_len value may end up wrapping around to a small integer number which will be used in memory allocation. If the attack succeeds in such way, subsequent operations can write past the end of the buffer.

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-2022-28733
• 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-2022-28733
• https://security.netapp.com/advisory/ntap-20230825-0002/
• https://www.openwall.com/lists/oss-security/2022/06/07/5

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