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Fencer Vulns
medium 6.5

CVE-2023-6240 json

Kernel: marvin vulnerability side-channel leakage in the rsa decryption operation

published 2024-02-04 2 y ago modified 2026-11-05 4 d ago also EUVD-2023-58486

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

Summary

A Marvin vulnerability side-channel leakage was found in the RSA decryption operation in the Linux Kernel. This issue may allow a network attacker to decrypt ciphertexts or forge signatures, limiting the services that use that private key.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:4.18.0-553.5.1.el8_10, 0:4.18.0-553.5.1.rt7.346.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:5.14.0-427.16.1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:5.14.0-70.101.1.el9_0, 0:5.14.0-70.101.1.rt21.173.el9_0
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.62.1.el9_2, 0:5.14.0-284.62.1.rt14.347.el9_2
  • kernel-rt RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.5.1.rt7.346.el8_10

red hat advisories RHSA-2024:3627RHSA-2024:3618RHSA-2024:3414RHSA-2024:3421RHSA-2024:1881RHSA-2024:1882

  • kernel AlmaLinux 8 4.18.0-553.5.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.5.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.5.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.5.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.5.1.el8_10

almalinux advisories ALSA-2024:3618ALSA-2024:3627ALSA-2024:2758

  • kernel-rt Rocky Linux 8 4.18.0-553.5.1.rt7.346.el8_10
  • kernel Rocky Linux 8 4.18.0-553.5.1.el8_10
  • kernel Rocky Linux 9 5.14.0-427.16.1.el9_4

rocky linux advisories RLSA-2024:3627RLSA-2024:3618RLSA-2024:2758

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-2023-6240 updated cvss 6.5

kernel: Marvin vulnerability side-channel leakage in the RSA decryption operation

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-debuginfo-common-s390x 5.14.0-70.101.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.101.1.el9_0, kernel-debuginfo-common-aarch64 5.14.0-70.101.1.el9_0, kernel-debuginfo-common-ppc64le 5.14.0-70.101.1.el9_0
    fixed: vendor fix RHSA-2024:3421
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.62.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.62.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.62.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.62.1.el9_2
    fixed: vendor fix RHSA-2024:1881
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.16.1.el9_4, perf 5.14.0-427.16.1.el9_4, rtla 5.14.0-427.16.1.el9_4, kernel-devel-matched 5.14.0-427.16.1.el9_4, kernel-64k-devel-matched 5.14.0-427.16.1.el9_4, kernel-debug-devel-matched 5.14.0-427.16.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:2758
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) perf 5.14.0-70.101.1.el9_0, kernel-devel-matched 5.14.0-70.101.1.el9_0, kernel-debug-devel-matched 5.14.0-70.101.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.101.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.101.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.101.1.el9_0, +2 more
    fixed: vendor fix RHSA-2024:3421
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.62.1.el9_2, rtla 5.14.0-284.62.1.el9_2, kernel-devel-matched 5.14.0-284.62.1.el9_2, kernel-64k-devel-matched 5.14.0-284.62.1.el9_2, kernel-debug-devel-matched 5.14.0-284.62.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.62.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:1881
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.5.1.el8_10, kernel 4.18.0-553.5.1.el8_10, bpftool 4.18.0-553.5.1.el8_10, kernel-core 4.18.0-553.5.1.el8_10, kernel-tools 4.18.0-553.5.1.el8_10, python3-perf 4.18.0-553.5.1.el8_10, +15 more
    fixed: vendor fix RHSA-2024:3618
show 14 more
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.16.1.el9_4, kernel 5.14.0-427.16.1.el9_4, kernel-64k 5.14.0-427.16.1.el9_4, kernel-core 5.14.0-427.16.1.el9_4, kernel-tools 5.14.0-427.16.1.el9_4, python3-perf 5.14.0-427.16.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:2758
  • Red Hat Enterprise Linux BaseOS EUS (v.9.0) kernel 5.14.0-70.101.1.el9_0, bpftool 5.14.0-70.101.1.el9_0, kernel-core 5.14.0-70.101.1.el9_0, kernel-tools 5.14.0-70.101.1.el9_0, python3-perf 5.14.0-70.101.1.el9_0, kernel-modules 5.14.0-70.101.1.el9_0, +14 more
    fixed: vendor fix RHSA-2024:3421
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.62.1.el9_2, kernel 5.14.0-284.62.1.el9_2, kernel-64k 5.14.0-284.62.1.el9_2, kernel-core 5.14.0-284.62.1.el9_2, kernel-tools 5.14.0-284.62.1.el9_2, python3-perf 5.14.0-284.62.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:1881
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.5.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.5.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.5.1.el8_10
    fixed: vendor fix RHSA-2024:3618
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.16.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.16.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.16.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.16.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.16.1.el9_4
    fixed: vendor fix RHSA-2024:2758
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-kvm 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-core 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-modules 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-kvm 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-core 4.18.0-553.5.1.rt7.346.el8_10, +4 more
    fixed: vendor fix RHSA-2024:3627
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.16.1.el9_4, kernel-rt-kvm 5.14.0-427.16.1.el9_4, kernel-rt-core 5.14.0-427.16.1.el9_4, kernel-rt-modules 5.14.0-427.16.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.16.1.el9_4, kernel-rt-debug-core 5.14.0-427.16.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:2758
  • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-core 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-modules 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-debug-core 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-debug-modules 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-modules-extra 5.14.0-70.101.1.rt21.173.el9_0, +2 more
    fixed: vendor fix RHSA-2024:3414
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-core 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-modules 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-debug-core 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-modules-core 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-debug-modules 5.14.0-284.62.1.rt14.347.el9_2, +4 more
    fixed: vendor fix RHSA-2024:1882
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-kvm 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-core 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-modules 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-debug-kvm 5.14.0-70.101.1.rt21.173.el9_0, kernel-rt-debug-core 5.14.0-70.101.1.rt21.173.el9_0, +4 more
    fixed: vendor fix RHSA-2024:3414
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-kvm 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-core 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-modules 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-debug-kvm 5.14.0-284.62.1.rt14.347.el9_2, kernel-rt-debug-core 5.14.0-284.62.1.rt14.347.el9_2, +6 more
    fixed: vendor fix RHSA-2024:1882
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-core 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-modules 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-core 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-modules 4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-modules-extra 4.18.0-553.5.1.rt7.346.el8_10, +2 more
    fixed: vendor fix RHSA-2024:3627
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.16.1.el9_4, kernel-rt-core 5.14.0-427.16.1.el9_4, kernel-rt-modules 5.14.0-427.16.1.el9_4, kernel-rt-debug-core 5.14.0-427.16.1.el9_4, kernel-rt-modules-core 5.14.0-427.16.1.el9_4, kernel-rt-debug-modules 5.14.0-427.16.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:2758
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.62.1.el9_2
    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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.97% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns 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.