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Fencer Intel
medium 5.5

CVE-2015-7837 json

The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, all…

published 9y ago modified 4mo ago also EUVD-2015-7735

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 4.5.1-1

debian advisories DEBIAN-CVE-2015-7837

  • linux Ubuntu 16.04 LTS 4.4.0-93.116
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1032.41
  • linux-gke Ubuntu 16.04 LTS 4.4.0-1028.28
  • linux-lts-vivid Ubuntu 14.04 LTS 3.19.0-74.82~14.04.1
  • linux-lts-xenial Ubuntu 14.04 LTS 4.4.0-93.116~14.04.1

ubuntu advisories UBUNTU-CVE-2015-7837

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 RHEL 7 3.10.0-327.el7
  • perf RHEL 7 3.10.0-327.el7
  • python-perf RHEL 7 3.10.0-327.el7
  • kernel-kdump RHEL 7 3.10.0-327.el7
  • kernel-tools RHEL 7 3.10.0-327.el7
  • kernel-tools-libs RHEL 7 3.10.0-327.el7
  • kernel-bootwrapper RHEL 7 3.10.0-327.el7
  • kernel-abi-whitelists RHEL 7 3.10.0-327.el7

red hat advisories RHSA-2015:2152RHSA-2015:2411

Is CVE-2015-7837 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2015-7837 updated cvss 1.9

kernel: securelevel disabled after kexec

  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: no fix available
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, kernel-abi-whitelists 3.10.0-327.el7, +1 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, kernel-abi-whitelists 3.10.0-327.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.el7
    fixed: vendor fix RHSA-2015:2152
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-327.rt56.204.el7, kernel-rt-trace 3.10.0-327.rt56.204.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-327.rt56.204.el7
    fixed: vendor fix RHSA-2015:2411
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-kdump 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, +6 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-327.el7, kernel-debuginfo-common-x86_64 3.10.0-327.el7, kernel-debuginfo-common-ppc64le 3.10.0-327.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, kernel-abi-whitelists 3.10.0-327.el7, +1 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.el7
    fixed: vendor fix RHSA-2015:2152
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    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

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness

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.