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NVD / CVE Program· CNA redhat

CVE-2023-6240: Kernel: marvin vulnerability side-channel leakage in the rsa decryption operation

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.96% (FIRST EPSS); higher than 62% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: bpftool (AlmaLinux:9) 7.3.0-427.16.1.el9_4; kernel (AlmaLinux:9) 5.14.0-427.16.1.el9_4; kernel-64k (AlmaLinux:9) 5.14.0-427.16.1.el9_4.

Low priority for now. Upgrade to bpftool (AlmaLinux:9) 7.3.0-427.16.1.el9_4; kernel (AlmaLinux:9) 5.14.0-427.16.1.el9_4; kernel-64k (AlmaLinux:9) 5.14.0-427.16.1.el9_4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Feb 4, 2024
Updated
Nov 5, 2026
EPSS
0.9% · 62th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.5
CNA · redhat
6.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-6240

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelall versions
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • 0:4.18.0-553.5.1.rt7.346.el8_10 and laternot affected · rpm
    • 0:4.18.0-553.5.1.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:5.14.0-427.16.1.el9_4 and laternot affected · rpm
    • 0:5.14.0-427.16.1.el9_4 and laternot affected · rpm
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support

    • 0:5.14.0-70.101.1.el9_0 and laternot affected · rpm
    • 0:5.14.0-70.101.1.rt21.173.el9_0 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support

    • 0:5.14.0-284.62.1.el9_2 and laternot affected · rpm
    • 0:5.14.0-284.62.1.rt14.347.el9_2 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9bpftoolbefore 7.3.0-427.16.1.el9_47.3.0-427.16.1.el9_4
AlmaLinux:9kernelbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64kbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-corebefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-debugbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-develbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-corebefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-cross-headersbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-debugbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-debug-corebefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-debug-develbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-427.16.1.el9_45.14.0-427.16.1.el9_4

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-1085Jan 31, 2024 · Use-after-free in Linux kernel's netfilter: nf_tables component
    31Monitor
  • ← EarlierCVE-2024-1086Jan 31, 2024 · Use-after-free in Linux kernel's netfilter: nf_tables componentKEV
    69This week
  • Later →CVE-2024-22386Feb 5, 2024 · Race condition vulnerability in Linux kernel drm/exynos exynos_drm_crtc_atomic_disable
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:bpftool7.3.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-427.16.1.el9_4 · AlmaLinux:9Package registry (OSV)
red hat:bpftool-debuginfo0:7.0.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-284.62.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
rocky linux:kernel0:5.14.0-427.16.1.el9_4 · Rocky Linux:9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2021-47226107 days apartx86/fpu: Invalidate FPU state after a failed XRSTOR from a user buffer
    28Monitor
  • CVE-2024-05645 days apartKernel: max page sharing of kernel samepage merging (ksm) may cause memory deduplication
    26Monitor
  • CVE-2022-48730137 days apartdma-buf: heaps: Fix potential spectre v1 gadget
    22Monitor
  • CVE-2024-47678260 days aparticmp: change the order of rate limits
    22Monitor
  • CVE-2024-50102275 days apartx86: fix user address masking non-canonical speculation issue
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-203 · Observable Discrepancy

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records