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CVE Record

CVE-2025-0624: Grub2: net: out-of-bounds write in grub_net_search_config_file()

A flaw was found in grub2. During the network boot process, when trying to search for the configuration file, grub copies data from a user controlled environment variable into an internal buffer using the grub_strcpy() function. During this step, it fails to consider the environment variable length when allocating the internal buffer, resulting in an out-of-bounds write. If correctly exploited, this issue may result in remote code execution through the same network segment grub is searching for the boot information, which can be used to by-pass secure boot protections.

HighCVSS 7.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2025-0624 is a GRUB2 bootloader flaw that can corrupt memory during network boot configuration discovery. The main business concern is systems that boot from the network: a successful attack could run code before the operating system starts and may bypass Secure Boot protections.

Executive priority

Treat this as a high-priority infrastructure hardening item, not an internet-wide emergency. Focus first on network-booted RHEL and OpenShift environments where pre-OS compromise would affect trust, recovery, or regulated workloads.

Technical view

GRUB2’s grub_net_search_config_file() copies a user-controlled environment variable into an internal buffer with grub_strcpy() without allocating for the variable length, causing an out-of-bounds write. The CVSS 3.1 score is 7.6, with adjacent-network attack vector, high complexity, high privileges, and changed scope.

Likely exposure

Exposure is most relevant for Red Hat Enterprise Linux 7 ELS, RHEL 8 and 9 variants, and Red Hat OpenShift/RHCOS versions listed as affected, especially where network boot is enabled or reachable on the same segment.

Exploitation context

The bundle says exploitation could allow remote code execution from the same network segment used for boot information. KEV is false, and no provided source states active exploitation, public exploit availability, or weaponized attacks.

Researcher notes

Evidence supports an out-of-bounds write in GRUB2 network boot config search. The provided CVSS requires adjacent network access, high privileges, and high attack complexity. The bundle does not provide exploit details, proof-of-concept status, or complete cross-vendor impact.

Mitigation direction

  • Apply the applicable Red Hat RHSA updates for affected RHEL and OpenShift/RHCOS versions.
  • Review vendor guidance for any non-Red Hat products that ship affected GRUB2 components.
  • Restrict network boot services to trusted management networks where operationally possible.
  • Disable unnecessary network boot paths on systems that do not require them.
  • Prioritize Secure Boot-sensitive and PXE/network-booted infrastructure first.

Validation and detection

  • Inventory systems running affected grub2 or rhcos package versions listed in the bundle.
  • Identify servers, workstations, and cluster nodes configured for network boot.
  • Confirm the installed package version matches the applicable vendor-fixed advisory level.
  • Check boot infrastructure segmentation and access controls for same-segment exposure.
  • Track remediation against Red Hat advisories and vendor-specific guidance.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-787: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2025-0624 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
2ADP providers
21Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.6CVSS 3.1HighCVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H16redhat

Vulnerability scoring details

Base CVSS 3.1 score

7.6High
CVSS 3.1 vector shape for CVE-2025-0624Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. Source timelineredhat

    Reported to Red Hat.

  3. Source timelineredhat

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Unknown vendorgrub2grub2, 0unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportgrub2, 1:2.02-0.87.el7_9.15affected
Red HatRed Hat Enterprise Linux 8grub2, 1:2.02-162.el8_10affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportgrub2, 1:2.02-87.el8_2.13affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportgrub2, 1:2.02-99.el8_4.12affected
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update Servicegrub2, 1:2.02-99.el8_4.12affected
Red HatRed Hat Enterprise Linux 8.4 Update Services for SAP Solutionsgrub2, 1:2.02-99.el8_4.12affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportgrub2, 1:2.02-123.el8_6.18affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Servicegrub2, 1:2.02-123.el8_6.18affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionsgrub2, 1:2.02-123.el8_6.18affected
Red HatRed Hat Enterprise Linux 8.8 Extended Update Supportgrub2, 1:2.02-152.el8_8.2affected
Red HatRed Hat Enterprise Linux 9grub2, 1:2.06-94.el9_5affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionsgrub2, 1:2.06-27.el9_0.22affected
Red HatRed Hat Enterprise Linux 9.2 Extended Update Supportgrub2, 1:2.06-61.el9_2.10affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportgrub2, 1:2.06-86.el9_4.2affected
Red HatRed Hat OpenShift Container Platform 4.12rhcos, 412.86.202503310142-0affected
Red HatRed Hat OpenShift Container Platform 4.13rhcos, 413.92.202504070146-0affected
Red HatRed Hat OpenShift Container Platform 4.14rhcos, 414.92.202505141057-0affected
Red HatRed Hat OpenShift Container Platform 4.15rhcos, 415.92.202504282058-0affected
Red HatRed Hat OpenShift Container Platform 4.16rhcos, 416.94.202503252048-0affected
Red HatRed Hat OpenShift Container Platform 4.17rhcos, 417.94.202503241418-0affected
Red HatRed Hat OpenShift Container Platform 4.18rhcos, 418.94.202504021150-0affected
Red HatRed Hat Enterprise Linux 10grub2unaffected
Weakness

CWE details

CWE-787

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-787 · source CWE mapping

Out-of-bounds Write

Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs