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NVD / CVE Program· CNA redhat

CVE-2024-0340: Kernel: information disclosure in vhost/vhost.c:vhost_new_msg()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: git.kernel.org/pub/scm/linux/kernel kernel 6.4-rc6.

Low priority for now. Upgrade to git.kernel.org/pub/scm/linux/kernel kernel 6.4-rc6 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 vulnerability was found in vhost_new_msg in drivers/vhost/vhost.c in the Linux kernel, which does not properly initialize memory in messages passed between virtual guests and the host operating system in the vhost/vhost.c:vhost_new_msg() function. This issue can allow local privileged users to read some kernel memory contents when reading from the /dev/vhost-net device file.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jan 9, 2024
Updated
Oct 29, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · redhat
4.4
1.1 point gap

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

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

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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

Affected versions

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

  • linux linux kernelbefore 6.4
  • linux linux kernel6.4

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.

  • git.kernel.org/pub/scm/linux/kernel kernel

    • before 6.4-rc6affected · semver

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected
    • all versionsaffected

  • 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

    • 0:5.14.0-503.11.1.el9_5 and laternot affected · rpm
    • 0:5.14.0-503.11.1.el9_5 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support

    • 0:5.14.0-427.68.1.el9_4 and laternot affected · rpm

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8kernel-rtbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-kvmbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-kvmbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
AlmaLinux:8kernel-rt-modules-extrabefore 4.18.0-553.5.1.rt7.346.el8_104.18.0-553.5.1.rt7.346.el8_10
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.4.4-16.4.4-1
openSUSE:Leap 15.5dtb-aarch64before 5.14.21-150500.55.49.15.14.21-150500.55.49.1
openSUSE:Leap 15.5kernel-64kbbefore 5.14.21-150500.55.49.15.14.21-150500.55.49.1
openSUSE:Leap 15.5kernel-azurebefore 5.14.21-150500.33.34.15.14.21-150500.33.34.1
openSUSE:Leap 15.5kernel-debugbefore 5.14.21-150500.55.49.15.14.21-150500.55.49.1
openSUSE:Leap 15.5kernel-defaultbefore 5.14.21-150500.55.49.15.14.21-150500.55.49.1
openSUSE:Leap 15.5kernel-default-basebefore 5.14.21-150500.55.49.1.150500.6.21.25.14.21-150500.55.49.1.150500.6.21.2
openSUSE:Leap 15.5kernel-docsbefore 5.14.21-150500.55.49.15.14.21-150500.55.49.1
openSUSE:Leap 15.5kernel-kvmsmallbefore 5.14.21-150500.55.49.15.14.21-150500.55.49.1
openSUSE:Leap 15.5kernel-obs-buildbefore 5.14.21-150500.55.49.15.14.21-150500.55.49.1
openSUSE:Leap 15.5kernel-obs-qabefore 5.14.21-150500.55.49.15.14.21-150500.55.49.1

+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-2022-2588Jan 8, 2024 · It was discovered that the cls_route filter implementation in the Linux kernel would not remove an old filter from the hashtable before free
    33Monitor
  • ← EarlierCVE-2022-2602Jan 8, 2024 · io_uring UAF, Unix SCM garbage collection
    28Monitor
  • Later →CVE-2023-51780Jan 11, 2024 · An issue was discovered in the Linux kernel before 6.6.8.
    28Monitor

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
git.kernel.org/pub/scm/linux/kernel kernel6.4-rc6Vendor (CNA)
almalinux:kernel-rt4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-kvm4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-kvm4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.5.1.rt7.346.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch645.14.21-150500.55.49.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-64kb5.14.21-150500.55.49.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-azure5.14.21-150500.33.34.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-debug5.14.21-150500.55.49.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-default5.14.21-150400.24.108.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-default-base5.14.21-150400.24.108.1.150400.24.50.2 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-docs5.14.21-150500.55.49.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-kvmsmall5.14.21-150500.55.49.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-obs-build5.14.21-150500.55.49.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-rt5.14.21-150400.15.68.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-source-azure5.14.21-150500.33.34.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:kernel-syms-azure5.14.21-150500.33.34.1 · openSUSE:Leap 15.5Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)

+25

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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-2024-36910142 days apartuio_hv_generic: Don't free decrypted memory
    33Monitor
  • CVE-2024-2686499 days aparttcp: Fix refcnt handling in __inet_hash_connect().
    31Monitor
  • CVE-2024-36955142 days apartALSA: hda: intel-sdw-acpi: fix usage of device_get_named_child_node()
    30Monitor
  • CVE-2021-47403133 days apartipack: ipoctal: fix module reference leak
    28Monitor
  • CVE-2022-0850498 days apartA vulnerability was found in linux kernel, where an information leak occurs via ext4_extent_header to userspace.
    28Monitor
  • CVE-2021-3714504 days apartA flaw was found in the Linux kernels memory deduplication mechanism.
    23Monitor

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

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

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

nvd-primary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

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

Change log

  1. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records