Vulnerability-Lookup

RHSA-2026:96240

Vulnerability from csaf_redhat - Published: 2026-11-09 12:10 - Updated: 2026-11-09 12:10

Summary

Red Hat Security Advisory: edk2 security update

Severity

Critical

Notes

Topic: An update for edk2 is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: EDK (Embedded Development Kit) is a project to enable UEFI support for Virtual Machines. This package contains a sample 64-bit UEFI firmware for QEMU and KVM. Security Fix(es): * edk2: Pre-boot RCE in EDK II PXE driver (CVE-2026-97631) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-97631

A flaw was found in EDK2. Due to improper buffer size calculations in the firmware, an unauthenticated remote attacker can trigger a buffer overflow. Successful exploitation can lead to arbitrary code execution or cause a denial of service (DoS).

8.8 (High)


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

CWE-787 - Out-of-bounds Write

Affected products

Fixed 12 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:edk2-0:20251114-5.el10_2.3.src	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:edk2-aarch64-0:20251114-5.el10_2.3.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:edk2-ovmf-0:20251114-5.el10_2.3.noarch	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-aarch64-0:20251114-5.el10_2.3.noarch	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-debugsource-0:20251114-5.el10_2.3.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-debugsource-0:20251114-5.el10_2.3.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-ovmf-0:20251114-5.el10_2.3.noarch	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-tools-0:20251114-5.el10_2.3.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-tools-0:20251114-5.el10_2.3.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-tools-debuginfo-0:20251114-5.el10_2.3.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-tools-debuginfo-0:20251114-5.el10_2.3.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.2.Z:edk2-tools-doc-0:20251114-5.el10_2.3.noarch	—	Vendor Fix fix

Threats

Impact Critical

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:96240	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2559129	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-97631	self
https://bugzilla.redhat.com/show_bug.cgi?id=2559129	external
https://www.cve.org/CVERecord?id=CVE-2026-97631	external
https://nvd.nist.gov/vuln/detail/CVE-2026-97631	external
https://github.com/tianocore/edk2/security/adviso…	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-97631",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2026-10-22T16:43:01.734085+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2559129"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in EDK2. Due to improper buffer size calculations in the firmware, an unauthenticated remote attacker can trigger a buffer overflow. Successful exploitation can lead to arbitrary code execution or cause a denial of service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "edk2: Pre-boot RCE in EDK II PXE driver",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as Critical because an unauthenticated network attacker can execute arbitrary code within the pre-boot firmware execution environment without prior access privileges or user interaction. In Red Hat Enterprise Linux and OpenShift environments, EDK2 provides UEFI firmware for virtualized guests. The vulnerability is exposed exclusively during network boot sequences when the PXE driver processes untrusted network packets before the operating system initializes. Virtual machines booting strictly from local storage or operating in their normal post-boot runtime are not exposed to this flaw.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "CRB-10.2.Z:edk2-tools-doc-0:20251114-5.el10_2.3.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-97631"
        },
        {
          "category": "external",
          "summary": "RHBZ#2559129",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559129"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-97631",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-97631"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-97631",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97631"
        },
        {
          "category": "external",
          "summary": "https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m",
          "url": "https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m"
        }
      ],
      "release_date": "2026-10-22T16:32:27.619000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-09T12:10:27+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "AppStream-10.2.Z:edk2-aarch64-0:20251114-5.el10_2.3.noarch",
            "AppStream-10.2.Z:edk2-ovmf-0:20251114-5.el10_2.3.noarch",
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            "CRB-10.2.Z:edk2-tools-doc-0:20251114-5.el10_2.3.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:96240"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "edk2: Pre-boot RCE in EDK II PXE driver"
    }
  ]
}

CVE-2026-97631 (GCVE-0-2026-97631)

Vulnerability from cvelistv5 – Published: 2026-10-22 16:32 – Updated: 2026-10-30 19:34

Title

Pre-boot RCE in EDK II PXE driver

Summary

EDK2 contains a vulnerability in BIOS where a user may cause “Out-of-bounds Write”, Classic Buffer Overflow, and “Incorrect Calculation of Buffer Size” by remote access. Successful exploitation of this vulnerability can lead to arbitrary code execution. It could also impact Confidentiality, Integrity, and Availability.

Severity

9.5 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-30 19:34 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-131 - Incorrect calculation of buffer size
CWE-787 - Out-of-bounds write

Assigner

TianoCore CNA under the mitre root

CNA scorecard – unranked: 1 record in the last 180 days, 10 needed details

References

6 references

URL	Tags
https://github.com/tianocore/edk2/security/adviso…
https://arstechnica.com/security/2026/10/code-exe…
https://news.ycombinator.com/item?id=50265393
https://github.com/microsoft/mu_basecore/pull/1990
https://github.com/microsoft/mu_basecore/pull/1989
http://www.openwall.com/lists/oss-security/2026/10/28/4

Impacted products

1 product

Vendor	Product	Version
TianoCore	EDK2	Affected: 0 , ≤ edk2-stable202608 (custom)

Date Public

2026-10-22 16:32

Credits

Alex Matrosov (Anthropic) Dan Holmes-Mitra (Google)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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