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Fencer Intel
medium 6.9

CVE-2015-2666 json

Stack-based buffer overflow in the get_matching_model_microcode function in arch/x86/kernel/cpu/microcode/intel_early.c in the Linux kernel…

published 11y ago modified 4mo ago also EUVD-2015-2758

cvss
6.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

Stack-based buffer overflow in the get_matching_model_microcode function in arch/x86/kernel/cpu/microcode/intel_early.c in the Linux kernel before 4.0 allows context-dependent attackers to gain privileges by constructing a crafted microcode header and leveraging root privileges for write access to the initrd.

Patch / fix

  • linux linux_kernel 3.10.83, 3.12.40, 3.14.47, 3.16.35, 3.18.19
  • linux Debian 14, Debian 13, Debian 12 3.16.7-ckt9-1

debian advisories DEBIAN-CVE-2015-2666

  • linux Ubuntu 14.04 LTS 3.13.0-51.84
  • linux-lts-utopic Ubuntu 14.04 LTS 3.16.0-36.48~14.04.1

ubuntu advisories UBUNTU-CVE-2015-2666

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 7 EXTRAS_RT 3.10.0-229.11.1.rt56.141.11.el7_1
  • kernel-rt-trace RHEL 7 EXTRAS_RT 3.10.0-229.11.1.rt56.141.11.el7_1
  • kernel-rt-debuginfo-common-x86_64 RHEL 7 EXTRAS_RT 3.10.0-229.11.1.rt56.141.11.el7_1
  • kernel RHEL 7 3.10.0-229.11.1.el7
  • kernel RHEL 7 3.10.0-229.11.1.ael7b
  • perf RHEL 7 3.10.0-229.11.1.el7
  • perf RHEL 7 3.10.0-229.11.1.ael7b
  • python-perf RHEL 7 3.10.0-229.11.1.el7

red hat advisories RHSA-2015:1565RHSA-2015:1534

  • kernel-ec2 SLE Module for Public Cloud 12 3.12.43-52.6.1
  • kernel-xen SLES for SAP 12, SLES 12, SLED 12 3.12.43-52.6.1
  • kernel-syms SLES for SAP 12, SLES 12, SLED 12 3.12.43-52.6.1
  • kernel-source SLES for SAP 12, SLES 12, SLED 12 3.12.43-52.6.1
  • kernel-default SLES for SAP 12, SLES 12, SLED 12 +1 more 3.12.43-52.6.1
  • kernel-obs-build SLE Software Development Kit 12 3.12.43-52.6.2
  • kgraft-patch-SLE12_Update_5 SLE Live Patching 12 1-2.3

suse advisories SUSE-SU-2015:1071-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-2666 updated cvss 6.0

kernel: execution in the early microcode loader

  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-229.11.1.el7, kernel 3.10.0-229.11.1.el7, kernel-tools 3.10.0-229.11.1.el7, kernel-tools-libs 3.10.0-229.11.1.el7, kernel-abi-whitelists 3.10.0-229.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.11.1.el7 Red Hat Enterprise Linux Client Optional (v. 7) python-perf 3.10.0-229.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.11.1.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-229.11.1.el7, kernel 3.10.0-229.11.1.el7, kernel-tools 3.10.0-229.11.1.el7, kernel-tools-libs 3.10.0-229.11.1.el7, kernel-abi-whitelists 3.10.0-229.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.11.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) python-perf 3.10.0-229.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.11.1.el7
    fixed: vendor fix RHSA-2015:1534
  • Red Hat Enterprise Linux Realtime (v. 7) kernel-rt 3.10.0-229.11.1.rt56.141.11.el7_1, kernel-rt-trace 3.10.0-229.11.1.rt56.141.11.el7_1, kernel-rt-debuginfo-common-x86_64 3.10.0-229.11.1.rt56.141.11.el7_1
    fixed: vendor fix RHSA-2015:1565
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-229.11.1.el7, kernel 3.10.0-229.11.1.el7, perf 3.10.0-229.11.1.ael7b, kernel 3.10.0-229.11.1.ael7b, kernel-kdump 3.10.0-229.11.1.el7, kernel-tools 3.10.0-229.11.1.el7, +11 more Red Hat Enterprise Linux Server Optional (v. 7) python-perf 3.10.0-229.11.1.el7, python-perf 3.10.0-229.11.1.ael7b, kernel-debuginfo-common-ppc64 3.10.0-229.11.1.el7, kernel-debuginfo-common-s390x 3.10.0-229.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.11.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-229.11.1.ael7b Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-229.11.1.el7, kernel 3.10.0-229.11.1.el7, kernel-tools 3.10.0-229.11.1.el7, kernel-tools-libs 3.10.0-229.11.1.el7, kernel-abi-whitelists 3.10.0-229.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.11.1.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) python-perf 3.10.0-229.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.11.1.el7
    fixed: vendor fix RHSA-2015:1534
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.