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CVE Record

CVE-2024-26856: net: sparx5: Fix use after free inside sparx5_del_mact_entry

In the Linux kernel, the following vulnerability has been resolved: net: sparx5: Fix use after free inside sparx5_del_mact_entry Based on the static analyzis of the code it looks like when an entry from the MAC table was removed, the entry was still used after being freed. More precise the vid of the mac_entry was used after calling devm_kfree on the mac_entry. The fix consists in first using the vid of the mac_entry to delete the entry from the HW and after that to free it.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux Sparx5 network-driver flaw can use MAC-table data after that memory has been freed. The supplied CVSS score is 8.8, reflecting potentially serious confidentiality, integrity, and availability consequences. Exposure depends on running affected kernel code and using the relevant driver path.

Executive priority

Treat as a high-priority kernel maintenance issue where Sparx5 networking is used, particularly near untrusted adjacent networks. Validate actual driver exposure before emergency action, but schedule supported kernel updates promptly because the modeled impact spans data confidentiality, integrity, and availability.

Technical view

During sparx5_del_mact_entry, the code freed a MAC-table entry before using its VLAN identifier to remove the corresponding hardware entry. The referenced fix reverses that order: delete the hardware entry using the identifier first, then free the memory.

Likely exposure

Likely exposure is limited to systems running an affected Linux kernel with the Sparx5 driver present and the vulnerable MAC-entry deletion path reachable. The bundle lists 5.14, 5.15.152, 6.1.82, 6.6.22, 6.7.10, and 6.8 as affected, alongside an anomalous version entry of “0.”

Exploitation context

The CVE is not listed as KEV, and the supplied sources do not report active exploitation or a public exploit. CVSS models adjacent-network access, low complexity, no privileges, and no user interaction. The description is based on static analysis, so practical exploitability is not established here.

Researcher notes

The source identifies a use-after-free ordering defect involving mac_entry->vid and devm_kfree. No CWE is assigned. Evidence establishes the defective sequence and correction, but not demonstrated exploitation, trigger reliability, or affected hardware configurations. The unusual affected-version metadata warrants confirmation against distribution advisories and kernel commit history.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable referenced stable fix.
  • If immediate updating is impossible, consult distribution or kernel-vendor guidance; no temporary mitigation is supplied.
  • After updating, reboot into the corrected kernel and verify the running version.
  • Prioritize affected systems reachable from adjacent, less-trusted network segments.

Validation and detection

  • Inventory running kernel versions and compare them with vendor-specific advisories and fixed packages.
  • Check whether the Sparx5 networking driver is built, loaded, or actively used.
  • Verify the installed kernel source or package includes the applicable referenced fix.
  • Review driver fault logs, while recognizing that no observed crash does not establish safety.
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-2024-26856 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:A/AC:L/PR:N/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
8.8CVSS 3.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2024-26856Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:A/AC:L/PR:N/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
LinuxLinuxb37a1bae742f92cc9b1f777d54e04ee3d86bbfc2, b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2, b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2, b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2, b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2unaffected
LinuxLinux5.14, 0, 5.15.152, 6.1.82, 6.6.22, 6.7.10, 6.8affected
Weakness

CWE details

No CWE listed

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