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CVE Record

CVE-2024-56717: net: mscc: ocelot: fix incorrect IFH SRC_PORT field in ocelot_ifh_set_basic()

In the Linux kernel, the following vulnerability has been resolved: net: mscc: ocelot: fix incorrect IFH SRC_PORT field in ocelot_ifh_set_basic() Packets injected by the CPU should have a SRC_PORT field equal to the CPU port module index in the Analyzer block (ocelot->num_phys_ports). The blamed commit copied the ocelot_ifh_set_basic() call incorrectly from ocelot_xmit_common() in net/dsa/tag_ocelot.c. Instead of calling with "x", it calls with BIT_ULL(x), but the field is not a port mask, but rather a single port index. [ side note: this is the technical debt of code duplication :( ] The error used to be silent and doesn't appear to have other user-visible manifestations, but with new changes in the packing library, it now fails loudly as follows: ------------[ cut here ]------------ Cannot store 0x40 inside bits 46-43 - will truncate sja1105 spi2.0: xmit timed out WARNING: CPU: 1 PID: 102 at lib/packing.c:98 __pack+0x90/0x198 sja1105 spi2.0: timed out polling for tstamp CPU: 1 UID: 0 PID: 102 Comm: felix_xmit Tainted: G W N 6.13.0-rc1-00372-gf706b85d972d-dirty #2605 Call trace: __pack+0x90/0x198 (P) __pack+0x90/0x198 (L) packing+0x78/0x98 ocelot_ifh_set_basic+0x260/0x368 ocelot_port_inject_frame+0xa8/0x250 felix_port_deferred_xmit+0x14c/0x258 kthread_worker_fn+0x134/0x350 kthread+0x114/0x138 The code path pertains to the ocelot switchdev driver and to the felix secondary DSA tag protocol, ocelot-8021q. Here seen with ocelot-8021q. The messenger (packing) is not really to blame, so fix the original commit instead.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel networking bug in specialized switch hardware support. On affected systems, locally triggered packet injection through the Ocelot/Felix switch driver path can fail loudly and disrupt availability. The cited CVSS is 5.5, with no confidentiality or integrity impact stated.

Executive priority

Treat as targeted moderate priority. It matters most for embedded, networking, or appliance-like Linux deployments using affected switch silicon. Patch during the normal security cycle unless those devices are operationally critical or already showing network instability.

Technical view

The bug is an incorrect SRC_PORT field value in ocelot_ifh_set_basic(). A port index was treated like a bitmask, causing packing failures and transmit timeouts in Ocelot switchdev and Felix secondary DSA tag protocol ocelot-8021q paths.

Likely exposure

Exposure is likely limited to Linux systems using Microsemi Ocelot switchdev or Felix DSA ocelot-8021q networking paths. General Linux servers without that hardware and driver path are unlikely exposed based on the supplied evidence.

Exploitation context

The CVSS vector requires local access and low privileges, with high availability impact. The bundle marks KEV as false, and no cited source claims active exploitation. The evidence describes driver failure conditions, not public weaponization.

Researcher notes

The source describes a correctness bug exposed by packing library behavior. The affected surface is driver-specific, and the supplied data does not prove remote reachability. Validate exposure through kernel branch, hardware, enabled driver, and runtime path evidence.

Mitigation direction

  • Apply the relevant Linux stable kernel fixes referenced by kernel.org.
  • Follow distribution guidance, including the cited Debian LTS advisory where applicable.
  • Prioritize systems using Ocelot or Felix switch hardware paths.
  • Check vendor kernel packages rather than backporting manually unless required.
  • Schedule testing for network availability after kernel updates.

Validation and detection

  • Inventory kernel versions against the CVE and distribution advisories.
  • Confirm whether mscc ocelot, felix, or ocelot-8021q paths are in use.
  • Review logs for packing warnings, transmit timeouts, or timestamp polling timeouts.
  • Test packet forwarding and switch functions after remediation.
  • Document non-exposure when the relevant hardware or drivers are absent.
Prepared
Confidence
high
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.

ATT&CK lookup starting points

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CVE-2024-56717 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2024-56717Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux06bcb9032e05ad717f9fd0a6e2fd3ae7f430fa31, ff7f554bbd75d5cbf00cded81d05147c6617e876, e1b9e80236c540fa85d76e2d510d1b38e1968c5d, e1b9e80236c540fa85d76e2d510d1b38e1968c5d, be3a532167dd562ec38900c846e7ae6cc39aa2f1, 6.1.107, 6.6.48, 6.10.7unaffected
LinuxLinux6.11, 0, 6.1.122, 6.6.68, 6.12.7, 6.13affected
Weakness

CWE details

No CWE listed

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