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CVE Record

CVE-2021-47564: net: marvell: prestera: fix double free issue on err path

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix double free issue on err path fix error path handling in prestera_bridge_port_join() that cases prestera driver to crash (see below). Trace: Internal error: Oops: 96000044 [#1] SMP Modules linked in: prestera_pci prestera uio_pdrv_genirq CPU: 1 PID: 881 Comm: ip Not tainted 5.15.0 #1 pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : prestera_bridge_destroy+0x2c/0xb0 [prestera] lr : prestera_bridge_port_join+0x2cc/0x350 [prestera] sp : ffff800011a1b0f0 ... x2 : ffff000109ca6c80 x1 : dead000000000100 x0 : dead000000000122 Call trace: prestera_bridge_destroy+0x2c/0xb0 [prestera] prestera_bridge_port_join+0x2cc/0x350 [prestera] prestera_netdev_port_event.constprop.0+0x3c4/0x450 [prestera] prestera_netdev_event_handler+0xf4/0x110 [prestera] raw_notifier_call_chain+0x54/0x80 call_netdevice_notifiers_info+0x54/0xa0 __netdev_upper_dev_link+0x19c/0x380

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can crash systems using the Marvell Prestera network driver when bridge port setup hits an error path. The business risk is mainly availability on specialized switching or networking platforms, not broad internet-facing compromise based on the supplied sources.

Executive priority

Treat as a targeted infrastructure reliability issue. Prioritize remediation for network platforms using Marvell Prestera, but do not treat it as broad enterprise exposure without confirming the driver and hardware are present.

Technical view

The bug is a double-free in prestera_bridge_port_join() error handling. The supplied trace shows a kernel Oops in prestera_bridge_destroy() during netdevice bridge linking, involving prestera_pci/prestera modules. Linux reports the vulnerability as resolved with stable kernel commits.

Likely exposure

Exposure appears limited to Linux systems that load and use the Marvell Prestera network driver, especially where bridge port operations are configured. The provided version data is incomplete and should be validated against kernel package versions and vendor backports.

Exploitation context

The bundle does not show KEV listing, public exploitation, or a remote attack path. Evidence supports a crash condition during a driver error path, likely requiring relevant hardware, driver use, and bridge configuration activity.

Researcher notes

The supplied CVE data lacks CVSS, CWE, and complete version-range clarity. The strongest evidence is the kernel fix description and crash trace. Avoid assuming privilege boundary impact or remote exploitability without vendor or upstream confirmation.

Mitigation direction

  • Check distribution or kernel vendor advisories for CVE-2021-47564 fixes.
  • Upgrade to a kernel package containing the referenced Prestera stable fixes.
  • Prioritize networking appliances or hosts using Marvell Prestera hardware.
  • If upgrades are delayed, limit unnecessary bridge reconfiguration on affected systems.

Validation and detection

  • Inventory systems loading prestera or prestera_pci kernel modules.
  • Confirm kernel versions and vendor backport status for CVE-2021-47564.
  • Review logs for kernel Oops traces involving prestera_bridge_destroy().
  • Verify bridge configurations on platforms using Marvell Prestera switching hardware.
Prepared
Confidence
medium
Sources
5

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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CVE-2021-47564 mapping review

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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
2ADP providers
4Source links

SSVC decision data

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

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
LinuxLinuxe1189d9a5fbec8153dbe03f3589bc2baa96694e2, e1189d9a5fbec8153dbe03f3589bc2baa96694e2, e1189d9a5fbec8153dbe03f3589bc2baa96694e2unaffected
LinuxLinux5.10, 0, 5.10.83, 5.15.6, 5.16affected
Weakness

CWE details

No CWE listed

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