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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-28733
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733
• https://www.openwall.com/lists/oss-security/2022/06/07/5
• https://security.netapp.com/advisory/ntap-20230825-0002