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CVE Record

CVE-2024-27403: netfilter: nft_flow_offload: reset dst in route object after setting up flow

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_flow_offload: reset dst in route object after setting up flow dst is transferred to the flow object, route object does not own it anymore. Reset dst in route object, otherwise if flow_offload_add() fails, error path releases dst twice, leading to a refcount underflow.

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 netfilter flow offload can release the same routing reference twice when flow creation fails. A low-privileged local attacker may be able to damage kernel state, potentially affecting confidentiality, integrity, and availability. The supplied CVSS score is 7.8; remote exploitation is not indicated.

Executive priority

Treat as a high-priority operating-system update where untrusted users or workloads can execute locally. It is less urgent for systems without such access, but version ambiguity warrants prompt inventory and vendor confirmation. Internet exposure alone does not satisfy the documented local attack requirement.

Technical view

After dst ownership transfers to a flow object, the route object retains the reference. If flow_offload_add() fails, error handling releases dst again, causing a reference-count underflow. The vulnerability is local, low-complexity, requires low privileges, and needs no user interaction according to the supplied CVSS vector.

Likely exposure

Prioritize Linux systems using nftables flow offload and permitting untrusted local access. The supplied version data spans Linux 4.16 through 6.8 but lacks clear range semantics. Confirm affectedness using distribution advisories, kernel provenance, and the referenced stable fixes rather than version numbers alone.

Exploitation context

The supplied record does not establish active exploitation, and its KEV indicator is false. The CVSS vector describes local access with low privileges and low complexity, but the sources provide no evidence about public exploit reliability, observed attacks, or required runtime configuration.

Researcher notes

The defect is a lifetime-management error on an error path: dst ownership moves to the flow object, but the stale route reference enables a second release. Multiple stable-kernel commits indicate branch-specific backports. Exact vulnerable ranges and practical exploitability are not established by the supplied bundle.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable stable fix.
  • Check distribution security guidance for fixed package versions and required reboot instructions.
  • Prioritize multi-user systems and hosts permitting untrusted local code execution.
  • Reduce unnecessary untrusted local access while patching is pending.

Validation and detection

  • Inventory installed kernel versions, package revisions, and distribution backports.
  • Determine whether nftables flow offload is enabled or used.
  • Verify the installed kernel includes the applicable referenced stable fix.
  • Confirm patched systems booted into the updated kernel.
  • Monitor vendor advisories for corrected affected-version boundaries.
Prepared
Confidence
medium
Sources
7

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.

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CVE-2024-27403 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.

1CVSS vectors
3Timeline events
2ADP providers
6Source links

SSVC decision data

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

CVSS vector scores

1 official score

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

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-27403Attack 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
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxa3c90f7a2323b331ae816d5b0633e68148e25d04, a3c90f7a2323b331ae816d5b0633e68148e25d04, a3c90f7a2323b331ae816d5b0633e68148e25d04, a3c90f7a2323b331ae816d5b0633e68148e25d04, a3c90f7a2323b331ae816d5b0633e68148e25d04unaffected
LinuxLinux4.16, 0, 5.15.150, 6.1.80, 6.6.19, 6.7.7, 6.8affected
Weakness

CWE details

No CWE listed

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