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TI-2026-79316 Aliases CVE-2026-97631

Memory corruption in EDK II PXE driver allows remote code execution

Priority MEDIUM 44CWE-120Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-120 and the CVSS impact.

Summary

TianoCore EDK2 through edk2-stable202608 contains a memory corruption flaw in its BIOS code. Incorrect buffer size calculations lead to out-of-bounds writes that overwrite memory (CWE-787). A remote attacker with no privileges and no user interaction can execute arbitrary code, with high impact to confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-11-01

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00635 50th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TianoCoreEDK2up to edk2-stable202608—No fix listedCNA
  • EDK2 VendorTianoCore Affected up to edk2-stable202608 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:*——TianoCore
  • cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:* Versions — — ·TianoCore

Remediation

The sources list no fixed version for EDK2. Red Hat lists Red Hat Enterprise Linux 8, 9 and 10 and Red Hat OpenShift Container Platform 4 and 5 as affected, with no plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-01

Vendor assessments

Red Hat

Red Hat rating: Critical. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
Not affected: 1 product
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-22 Threatist record created from CVE-2026-97631
  2. 2026-10-24 Affected versions changed · Red Hat
  3. 2026-10-24 CVSS score added · Red Hat
  4. 2026-10-29 EPSS moved to the 50th–90th percentile
  5. 2026-10-30 Affected versions changed · Red Hat
  6. 2026-10-30 CISA SSVC decision points changed
  7. 2026-11-01 Affected versions changed · Red Hat

References

Other 1

  • TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
  • TI-2023-24240 Buffer Overflow in EDK II Network Package CVSS 3.1HIGH 8.8
  • TI-2023-24238 Infinite loop in EDK II Network Package CVSS 3.1HIGH 7.5
  • TI-2023-24235 Buffer Overflow in EDK II Network Package CVSS 3.1HIGH 8.8
  • TI-2023-26565 An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2. CVSS 3.1MEDIUM 6.7
  • TI-2023-24236 Out-of-Bounds Read in EDK II Network Package CVSS 3.1MEDIUM 6.5
See all 53 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences