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  4. CVE 2025 0686 grub2 romfs integer overflow when handling
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Back to active CVEs
Medium · CVSS 6.4CVE-2025-0686

Grub2: romfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading datCVE-2025-0686

Answer in brief

CVE-2025-0686 records a Medium severity (CVSS 6.4) vulnerability in Grub2: romfs: integer overflow when handling symlinks may lead to heap based out-of-bounds write when reading dat. The current sources do not mark it as known exploited. The current feed maps grub2 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 3, 2025Updated Oct 21, 2026Source checked Nov 4, 2026First seen by HOL Jun 25, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.4
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps grub2 (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
grub2generic>=0 <=2.12Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for grub2.
  2. 2Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Evidence timeline and material changes

  1. Published upstream

    Mar 3, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 25, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencelists.gnu.org
Upstream source description

A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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_romfs_read_symlink() may cause out-of-bounds writes when the calling grub_disk_read() function. This issue may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution by-passing secure boot protections.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Unvalidated user pointers in RTIO syscall verifiers allow a user-mode thread to write kernel memoryAlso CWE-787
  • I2S configure syscall handler passes an unvalidated user-supplied kernel object pointer to driversAlso CWE-787
  • Bluetooth LE Controller accepts received PDUs whose length field exceeds the configured maximum receive length, causing out-of-bounds read and writeAlso CWE-787
  • Inverted memory-permission check in the RTIO syscall verifier allows a user-mode thread to read and write arbitrary kernel memoryAlso CWE-787

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 4, 2026
References
3 linked sources
Open source record