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CVE Record

CVE-2024-56720: bpf, sockmap: Several fixes to bpf_msg_pop_data

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Several fixes to bpf_msg_pop_data Several fixes to bpf_msg_pop_data, 1. In sk_msg_shift_left, we should put_page 2. if (len == 0), return early is better 3. pop the entire sk_msg (last == msg->sg.size) should be supported 4. Fix for the value of variable "a" 5. In sk_msg_shift_left, after shifting, i has already pointed to the next element. Addtional sk_msg_iter_var_next may result in BUG.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux kernel BPF sockmap message handling can mishandle memory and message boundaries. A local user with limited privileges may be able to trigger serious confidentiality, integrity, or availability impacts. Internet-based exploitation is not indicated by the supplied CVSS vector.

Executive priority

Treat this as a high-priority kernel update for systems allowing low-privileged local access. Prioritize broadly shared or sensitive hosts. The absence of documented active exploitation lowers emergency pressure, but potential impact spans confidentiality, integrity, and availability.

Technical view

CVE-2024-56720 affects bpf_msg_pop_data and related sk_msg_shift_left logic. Reported defects include a missing put_page, zero-length handling, failure to support full-message removal, an incorrect variable value, and an extra iterator advance that may trigger a kernel BUG. It is classified as CWE-401 with CVSS 3.1 score 7.8.

Likely exposure

Exposure is limited to Linux kernels containing the vulnerable code where a low-privileged local actor can reach the affected BPF sockmap path. The supplied affected-version list is ambiguous and includes raw revisions, so distribution kernels and backports require vendor-specific verification.

Exploitation context

The CVSS vector describes local, low-complexity exploitation requiring low privileges and no user interaction. The supplied record is not in CISA KEV and provides no evidence of active exploitation or a public exploit. The precise exploitation primitive is not established by these sources.

Researcher notes

The record groups several correctness fixes into one CVE. Missing page release supports the CWE-401 classification, while iterator and boundary defects may cause a kernel BUG. The bundle does not establish whether every defect independently enables all CVSS impacts. Exact affected ranges cannot be reconstructed confidently from the flattened version data.

Mitigation direction

  • Install a vendor kernel containing the applicable stable fix for CVE-2024-56720.
  • Consult distribution advisories because vendor kernels may contain backported fixes without matching upstream version numbers.
  • Activate the updated kernel using the vendor's documented maintenance procedure.
  • Reduce unnecessary local account access while affected systems await remediation.

Validation and detection

  • Inventory running kernel builds, including distribution release and package revision.
  • Check vendor changelogs for CVE-2024-56720 or the applicable upstream stable commit.
  • Confirm the remediated kernel is running after maintenance, not merely installed.
  • Review kernel crash records for BPF or sockmap faults, recognizing they do not prove exploitation.
  • Identify systems where low-privileged local users can reach BPF sockmap functionality.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-401: Exact CWE lookup

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cve · low confidence lookup

CVE-2024-56720 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
3Timeline events
2ADP providers
11Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-56720Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux7246d8ed4dcce23f7509949a77be15fa9f0e3d28, 7246d8ed4dcce23f7509949a77be15fa9f0e3d28, 7246d8ed4dcce23f7509949a77be15fa9f0e3d28, 7246d8ed4dcce23f7509949a77be15fa9f0e3d28, 7246d8ed4dcce23f7509949a77be15fa9f0e3d28, 7246d8ed4dcce23f7509949a77be15fa9f0e3d28, 7246d8ed4dcce23f7509949a77be15fa9f0e3d28, 7246d8ed4dcce23f7509949a77be15fa9f0e3d28unaffected
LinuxLinux5.0, 0, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.64, 6.11.11, 6.12.2, 6.13affected
Weakness

CWE details

CWE-401

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-401 · source CWE mapping

Missing Release of Memory after Effective Lifetime

Missing Release of Memory after Effective Lifetime represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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