CVE-2025-54770: gnu grub2 Expired Pointer Dereference
Vulnerability summary
CVE-2025-54770 is a medium (CVSS 4.9) Expired Pointer Dereference vulnerability in gnu grub2. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 18-11-2025PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the net_set_vlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- OSV · DebianEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- NVDNIST4.9MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS trend
Probability
0.15%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
0.00 pp
From 0.15% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu3 products
- grub2All versions (No fix recorded)
- grub2-signedAll versions (No fix recorded)
- grub2-unsignedAll versions (No fix recorded)
Debian1 product
- grub2All versions (No fix recorded) | < 2.14-1
Gnu1 product
- grub2≤ 2.14
3 vendors · 5 products
