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NVD / CVE Program· CNA Linux

CVE-2024-40994: ptp: fix integer overflow in max_vclocks_store

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.27% (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 4b03da87d0b7074c93d9662c6e1a8939f9b8b86e, 666e934d749e50a37f3796caaf843a605f115b6f, 81d23d2a24012e448f651e007fac2cfd20a45ce0; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 6.6.47.1-1; azl3 kernel 6.6.47.1-1 on Azure Linux 3.0 6.6.47.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 4b03da87d0b7074c93d9662c6e1a8939f9b8b86e, 666e934d749e50a37f3796caaf843a605f115b6f, 81d23d2a24012e448f651e007fac2cfd20a45ce0; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 6.6.47.1-1; azl3 kernel 6.6.47.1-1 on Azure Linux 3.0 6.6.47.1-1 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: ptp: fix integer overflow in max_vclocks_store On 32bit systems, the "4 * max" multiply can overflow. Use kcalloc() to do the allocation to prevent this.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jul 12, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 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-2024-40994

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 kernel5.14 and later · before 5.15.162
  • linux linux kernel5.16 and later · before 6.1.96
  • linux linux kernel6.2 and later · before 6.6.36
  • linux linux kernel6.7 and later · before 6.9.7
  • linux linux kernel6.10

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

    • 5.14affected
    • 44c494c8e30e35713c7d11ca3c5ab332cbfabacf and later · before 4b03da87d0b7074c93d9662c6e1a8939f9b8b86eaffected · git
    • 44c494c8e30e35713c7d11ca3c5ab332cbfabacf and later · before d50d62d5e6ee6aa03c00bddb91745d0b632d3b0faffected · git
    • 44c494c8e30e35713c7d11ca3c5ab332cbfabacf and later · before 666e934d749e50a37f3796caaf843a605f115b6faffected · git
    • 44c494c8e30e35713c7d11ca3c5ab332cbfabacf and later · before e1fccfb4638ee6188377867f6015d0ce35764a8eaffected · git
    • 44c494c8e30e35713c7d11ca3c5ab332cbfabacf and later · before 81d23d2a24012e448f651e007fac2cfd20a45ce0affected · git
    • before 5.14not affected · semver
    • 5.15.162 and later · up to and including 5.15.*not affected · semver
    • 6.1.96 and later · up to and including 6.1.*not affected · semver
    • 6.6.36 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.99-16.1.99-1
Debian:13linuxbefore 6.9.7-16.9.7-1

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-2024-40991Jul 12, 2024 · dmaengine: ti: k3-udma-glue: Fix of_k3_udma_glue_parse_chn_by_id()
    22Monitor
  • ← EarlierCVE-2024-40992Jul 12, 2024 · RDMA/rxe: Fix responder length checking for UD request packets
    22Monitor
  • Later →CVE-2024-40996Jul 12, 2024 · bpf: Avoid splat in pskb_pull_reason
    31Monitor

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 Linux4b03da87d0b7074c93d9662c6e1a8939f9b8b86eVendor (CNA)
Linux Linux666e934d749e50a37f3796caaf843a605f115b6fVendor (CNA)
Linux Linux81d23d2a24012e448f651e007fac2cfd20a45ce0Vendor (CNA)
Linux Linuxd50d62d5e6ee6aa03c00bddb91745d0b632d3b0fVendor (CNA)
Linux Linuxe1fccfb4638ee6188377867f6015d0ce35764a8eVendor (CNA)
azl3 kernel 6.6.35.1-5 on Azure Linux 3.06.6.47.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.47.1-1 on Azure Linux 3.06.6.47.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.99-1 · 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-2023-0179473 days apartA buffer overflow vulnerability was found in the Netfilter subsystem in the Linux Kernel.
    32Monitor
  • CVE-2024-410000 days apartblock/ioctl: prefer different overflow check
    31Monitor
  • CVE-2022-488374 days apartusb: gadget: rndis: prevent integer overflow in rndis_set_response()
    31Monitor
  • CVE-2024-4213618 days apartcdrom: rearrange last_media_change check to avoid unintentional overflow
    31Monitor
  • CVE-2022-49030101 days apartlibbpf: Handle size overflow for ringbuf mmap
    31Monitor
  • CVE-2021-47098130 days aparthwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations
    31Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records