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CVE Record

CVE-2026-23019: net: marvell: prestera: fix NULL dereference on devlink_alloc() failure

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix NULL dereference on devlink_alloc() failure devlink_alloc() may return NULL on allocation failure, but prestera_devlink_alloc() unconditionally calls devlink_priv() on the returned pointer. This leads to a NULL pointer dereference if devlink allocation fails. Add a check for a NULL devlink pointer and return NULL early to avoid the crash.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A Linux networking driver can crash the kernel if a required management object cannot be allocated, such as during resource exhaustion. The documented impact is availability loss rather than data theft or code execution. Exposure depends on whether the Marvell Prestera driver is present and used.

Executive priority

Schedule remediation through normal-to-elevated kernel maintenance, prioritizing exposed or availability-critical networking systems using Prestera. Escalate if vendor guidance identifies remotely reachable conditions. Current evidence does not justify emergency treatment across Linux systems generally.

Technical view

The Prestera driver's prestera_devlink_alloc() passes a potentially NULL result from devlink_alloc() to devlink_priv(), causing a NULL-pointer dereference. The upstream correction checks the devlink pointer and returns early. The supplied record lists affected Linux versions but provides no CVSS score or CWE classification.

Likely exposure

Likely exposure is limited to affected Linux kernels using the Marvell Prestera network driver. Triggering also requires devlink allocation failure. The bundle does not establish whether that failure is remotely inducible, and its version data contains ambiguous entries, including “0” and repeated commit identifiers.

Exploitation context

The source bundle marks this CVE as absent from KEV and provides no evidence of active exploitation, public exploit code, or reliable remote attackability. The demonstrated consequence is a kernel crash after allocation failure; attacker control over that condition is not established.

Researcher notes

The failure path is straightforward, but practical exploitability is insufficiently documented. Allocation failure may occur under resource pressure, yet the bundle does not prove an unprivileged or remote actor can force it. Validate reachability, backport status, and version boundaries against the relevant kernel or product advisory.

Mitigation direction

  • Install a vendor or distribution kernel update incorporating the applicable referenced stable fix.
  • Prioritize network infrastructure that loads or uses the Marvell Prestera driver.
  • Consult Linux and equipment-vendor advisories to confirm fixed package versions.
  • Where updating is delayed, assess whether the unused Prestera driver can be safely disabled.

Validation and detection

  • Inventory kernel versions on systems that may use Marvell Prestera networking.
  • Confirm whether the Prestera driver is configured, loaded, or bound to hardware.
  • Verify the installed kernel contains the applicable referenced stable commit or vendor backport.
  • Review kernel logs for NULL dereferences associated with Prestera or devlink initialization.
Prepared
Confidence
medium
Sources
9

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

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
1ADP providers
8Source links

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

siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux34dd1710f5a3c9a7dc78e1ff6de69a19d407db25, 34dd1710f5a3c9a7dc78e1ff6de69a19d407db25, 34dd1710f5a3c9a7dc78e1ff6de69a19d407db25, 34dd1710f5a3c9a7dc78e1ff6de69a19d407db25, 34dd1710f5a3c9a7dc78e1ff6de69a19d407db25, 34dd1710f5a3c9a7dc78e1ff6de69a19d407db25unaffected
LinuxLinux5.10, 0, 5.15.198, 6.1.161, 6.6.121, 6.12.66, 6.18.6, 6.19affected
Weakness

CWE details

No CWE listed

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