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CVE Record

CVE-2024-27020: netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get() nft_unregister_expr() can concurrent with __nft_expr_type_get(), and there is not any protection when iterate over nf_tables_expressions list in __nft_expr_type_get(). Therefore, there is potential data-race of nf_tables_expressions list entry. Use list_for_each_entry_rcu() to iterate over nf_tables_expressions list in __nft_expr_type_get(), and use rcu_read_lock() in the caller nft_expr_type_get() to protect the entire type query process.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2024-27020 is a Linux kernel race condition in the nftables firewall subsystem. A local, low-privileged attacker may be able to trigger unsafe concurrent handling of expression types. The supplied CVSS assessment indicates potentially serious confidentiality, integrity, and availability impact, but the sources do not establish a reliable exploitation outcome.

Executive priority

Schedule prompt remediation for affected shared, administrative, and other multi-user Linux systems. Internet exposure alone does not enable the CVSS-described attack because access is local. Use normal high-severity patch timelines unless local access by untrusted users materially increases urgency.

Technical view

The nf_tables expression registry could be traversed by __nft_expr_type_get() while nft_unregister_expr() concurrently removed an entry. Missing read-side protection created a potential data race and unsafe list access. The kernel fix uses RCU-aware iteration and holds an RCU read lock across the expression-type query.

Likely exposure

Exposure is limited to Linux systems running an affected kernel with the relevant nf_tables code. The supplied affected-version data includes kernels from 3.13 through listed 6.x releases, but vendor backports may change status. Prioritize multi-user systems where untrusted local users have low-privileged access.

Exploitation context

The CVSS vector describes local access, low privileges, low complexity, and no user interaction. The supplied record is not in CISA KEV, and no cited source reports active exploitation. Treat practical exploitability and resulting impact as unconfirmed from this evidence.

Researcher notes

CWE-362 accurately reflects concurrent access without adequate synchronization. Eight stable-kernel commits are supplied, indicating fixes across maintained branches. Exact vulnerable ranges and exploit primitives are not established by this bundle; validate through distribution-specific package metadata rather than relying only on upstream version numbers.

Mitigation direction

  • Install a vendor-supported kernel update that includes the applicable upstream fix or distribution backport.
  • Reboot systems after updating so the corrected kernel is running.
  • Consult distribution or appliance advisories because package versions may contain backported fixes.
  • Restrict unnecessary local accounts while exposed systems await maintenance.

Validation and detection

  • Inventory running kernel versions on Linux hosts using nftables.
  • Compare each kernel package against its vendor advisory for CVE-2024-27020.
  • Confirm the updated kernel is active after reboot, not merely installed.
  • Review package changelogs for an explicit fix or referenced upstream commit.
Prepared
Confidence
high
Sources
6

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-362: Exact CWE lookup

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cve · low confidence lookup

CVE-2024-27020 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
3ADP providers
17Source links

SSVC decision data

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

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
7CVSS 3.1HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H15.9CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-27020Attack 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
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxef1f7df9170dbd875ce198ba84e6ab80f6fc139e, ef1f7df9170dbd875ce198ba84e6ab80f6fc139e, ef1f7df9170dbd875ce198ba84e6ab80f6fc139e, ef1f7df9170dbd875ce198ba84e6ab80f6fc139e, ef1f7df9170dbd875ce198ba84e6ab80f6fc139e, ef1f7df9170dbd875ce198ba84e6ab80f6fc139e, ef1f7df9170dbd875ce198ba84e6ab80f6fc139e, ef1f7df9170dbd875ce198ba84e6ab80f6fc139eunaffected
LinuxLinux3.13, 0, 4.19.313, 5.4.275, 5.10.216, 5.15.157, 6.1.88, 6.6.29, 6.8.8, 6.9affected
Weakness

CWE details

CWE-362

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

CWE-362 · source CWE mapping

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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