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NVD / CVE Program· CNA Linux

CVE-2024-56716: netdevsim: prevent bad user input in nsim_dev_health_break_write()

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: 0.20% (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: Linux Linux 470c5ecbac2f19b1cdee2a6ce8d5650c3295c94b, 81bdfcd6e6a998e219c9dd49ec7291c2e0594bbc, 8e9ef6bdf71bf25f4735e0230ce1919de8985835; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.76.1-1; azl3 kernel 6.6.76.1-1 on Azure Linux 3.0 6.6.76.1-1.

Low priority for now. Upgrade to Linux Linux 470c5ecbac2f19b1cdee2a6ce8d5650c3295c94b, 81bdfcd6e6a998e219c9dd49ec7291c2e0594bbc, 8e9ef6bdf71bf25f4735e0230ce1919de8985835; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.76.1-1; azl3 kernel 6.6.76.1-1 on Azure Linux 3.0 6.6.76.1-1 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

In the Linux kernel, the following vulnerability has been resolved: netdevsim: prevent bad user input in nsim_dev_health_break_write() If either a zero count or a large one is provided, kernel can crash.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Dec 29, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 11th 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.

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-2024-56716

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 kernel5.5 and later · before 5.10.233
  • linux linux kernel5.11 and later · before 5.15.176
  • linux linux kernel5.16 and later · before 6.1.122
  • linux linux kernel6.2 and later · before 6.6.68
  • linux linux kernel6.7 and later · before 6.12.7
  • linux linux kernel6.13

Versions reported by the vendor

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

  • Linux Linux

    • 5.5affected
    • 82c93a87bf8bc0cdb5ec2ab99da7d87715ff889f and later · before 81bdfcd6e6a998e219c9dd49ec7291c2e0594bbcaffected · git
    • 82c93a87bf8bc0cdb5ec2ab99da7d87715ff889f and later · before b3a6daaf7cfb2de37b89fd7a5a2ad4ea9aa3e181affected · git
    • 82c93a87bf8bc0cdb5ec2ab99da7d87715ff889f and later · before d10321be26ff9e9e912697e9e8448099654ff561affected · git
    • 82c93a87bf8bc0cdb5ec2ab99da7d87715ff889f and later · before 470c5ecbac2f19b1cdee2a6ce8d5650c3295c94baffected · git
    • 82c93a87bf8bc0cdb5ec2ab99da7d87715ff889f and later · before 8e9ef6bdf71bf25f4735e0230ce1919de8985835affected · git
    • 82c93a87bf8bc0cdb5ec2ab99da7d87715ff889f and later · before ee76746387f6233bdfa93d7406990f923641568faffected · git
    • before 5.5not affected · semver
    • 5.10.233 and later · up to and including 5.10.*not affected · semver
    • 5.15.176 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.123-16.1.123-1
Debian:13linuxbefore 6.12.8-16.12.8-1

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-2024-56713Dec 29, 2024 · net: netdevsim: fix nsim_pp_hold_write()
    22Monitor
  • ← EarlierCVE-2024-56715Dec 29, 2024 · ionic: Fix netdev notifier unregister on failure
    22Monitor
  • Later →CVE-2024-56717Dec 29, 2024 · net: mscc: ocelot: fix incorrect IFH SRC_PORT field in ocelot_ifh_set_basic()
    22Monitor

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
Linux Linux470c5ecbac2f19b1cdee2a6ce8d5650c3295c94bVendor (CNA)
Linux Linux81bdfcd6e6a998e219c9dd49ec7291c2e0594bbcVendor (CNA)
Linux Linux8e9ef6bdf71bf25f4735e0230ce1919de8985835Vendor (CNA)
Linux Linuxb3a6daaf7cfb2de37b89fd7a5a2ad4ea9aa3e181Vendor (CNA)
Linux Linuxd10321be26ff9e9e912697e9e8448099654ff561Vendor (CNA)
Linux Linuxee76746387f6233bdfa93d7406990f923641568fVendor (CNA)
azl3 kernel 6.6.64.2-9 on Azure Linux 3.06.6.76.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.76.1-1 on Azure Linux 3.06.6.76.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.173.1-2 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.173.1-2 on CBL-Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.176.3-1 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.123-1 · Debian:12Package 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-2021-47251222 days apartmac80211: fix skb length check in ieee80211_scan_rx()
    31Monitor
  • CVE-2024-38659191 days apartenic: Validate length of nl attributes in enic_set_vf_port
    28Monitor
  • CVE-2024-35963223 days apartBluetooth: hci_sock: Fix not validating setsockopt user input
    28Monitor
  • CVE-2024-35964223 days apartBluetooth: ISO: Fix not validating setsockopt user input
    28Monitor
  • CVE-2024-35965223 days apartBluetooth: L2CAP: Fix not validating setsockopt user input
    28Monitor
  • CVE-2022-50020171 days apartext4: avoid resizing to a partial cluster size
    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

  • 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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-1284 · Improper Validation of Specified Quantity in Input

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records