CVE-2022-28733
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.27% probability · 70th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-191
- Affected
- gnu/grub2
- Source
- security@ubuntu.com
EPSS 1.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230825-0002/
- https://www.openwall.com/lists/oss-security/2022/06/07/5Mailing List, Third Party Advisory
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230825-0002/
- https://www.openwall.com/lists/oss-security/2022/06/07/5Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.