CVE-2025-0685: A flaw was found in grub2

Q: How do I fix CVE-2025-0685?

grub2: upgrade to newer than 2.12. Exact commands for each OS are on this page.

Q: Is CVE-2025-0685 being exploited?

CVE-2025-0685 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-0685 affect?

CVE-2025-0685 affects grub2. Severity is medium (CVSS 6.4). A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer o

Q: How urgent is CVE-2025-0685?

Priority 28/100. No elevated risk signals yet.

Routine

MEDIUM 6.4UPGRADE

CVE-2025-0685 is a medium-severity flaw (CVSS 6.4) affecting grub2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jf

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-787
Published	2025-03-03
Last modified	2026-10-21

Publisher (CNA): Red Hat, Inc. · Vendor: gnu

Last updated 2026-10-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-03 18:15 UTCPublished CVE record published
2026-10-21 17:17 UTCUpdated Record last modified

gnu grub2 UPGRADE

Affected: <= 2.12

Fixed in: newer than 2.12

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy grub2 || rpm -q grub2 || grub2 --version

2. UPGRADE to newer than 2.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grub2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grub2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-0685?

grub2: upgrade to newer than 2.12. Exact commands for each OS are on this page.

Is CVE-2025-0685 being exploited?

CVE-2025-0685 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-0685 affect?

CVE-2025-0685 affects grub2. Severity is medium (CVSS 6.4). A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer o

How urgent is CVE-2025-0685?

Priority 28/100. No elevated risk signals yet.

Related CVEs

CVE-2023-4693 MEDIUM 5.3 UPGRADE MITIGATE An out-of-bounds read flaw was found on grub2's NTFS filesystem driver
CVE-2025-1125 HIGH 7.8 UPGRADE When reading data from a hfs filesystem, grub's hfs filesystem module uses user-controlled parameters from the
CVE-2025-0689 HIGH 7.8 UPGRADE When reading data from disk, the grub's UDF filesystem module utilizes the user controlled data length metadat
CVE-2025-0686 MEDIUM 6.4 UPGRADE A flaw was found in grub2
CVE-2025-0684 MEDIUM 6.4 UPGRADE A flaw was found in grub2

References

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