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CVE Record

CVE-2022-49452: dpaa2-eth: retrieve the virtual address before dma_unmap

In the Linux kernel, the following vulnerability has been resolved: dpaa2-eth: retrieve the virtual address before dma_unmap The TSO header was DMA unmapped before the virtual address was retrieved and then used to free the buffer. This meant that we were actually removing the DMA map and then trying to search for it to help in retrieving the virtual address. This lead to a invalid virtual address being used in the kfree call. Fix this by calling dpaa2_iova_to_virt() prior to the dma_unmap call. [ 487.231819] Unable to handle kernel paging request at virtual address fffffd9807000008 (...) [ 487.354061] Hardware name: SolidRun LX2160A Honeycomb (DT) [ 487.359535] pstate: a0400005 (NzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 487.366485] pc : kfree+0xac/0x304 [ 487.369799] lr : kfree+0x204/0x304 [ 487.373191] sp : ffff80000c4eb120 [ 487.376493] x29: ffff80000c4eb120 x28: ffff662240c46400 x27: 0000000000000001 [ 487.383621] x26: 0000000000000001 x25: ffff662246da0cc0 x24: ffff66224af78000 [ 487.390748] x23: ffffad184f4ce008 x22: ffffad1850185000 x21: ffffad1838d13cec [ 487.397874] x20: ffff6601c0000000 x19: fffffd9807000000 x18: 0000000000000000 [ 487.405000] x17: ffffb910cdc49000 x16: ffffad184d7d9080 x15: 0000000000004000 [ 487.412126] x14: 0000000000000008 x13: 000000000000ffff x12: 0000000000000000 [ 487.419252] x11: 0000000000000004 x10: 0000000000000001 x9 : ffffad184d7d927c [ 487.426379] x8 : 0000000000000000 x7 : 0000000ffffffd1d x6 : ffff662240a94900 [ 487.433505] x5 : 0000000000000003 x4 : 0000000000000009 x3 : ffffad184f4ce008 [ 487.440632] x2 : ffff662243eec000 x1 : 0000000100000100 x0 : fffffc0000000000 [ 487.447758] Call trace: [ 487.450194] kfree+0xac/0x304 [ 487.453151] dpaa2_eth_free_tx_fd.isra.0+0x33c/0x3e0 [fsl_dpaa2_eth] [ 487.459507] dpaa2_eth_tx_conf+0x100/0x2e0 [fsl_dpaa2_eth] [ 487.464989] dpaa2_eth_poll+0xdc/0x380 [fsl_dpaa2_eth]

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel driver memory-handling bug in the dpaa2-eth Ethernet driver. The source shows an invalid virtual address being freed, causing a kernel paging fault. Business impact is primarily availability risk on systems using this driver and affected kernel builds.

Executive priority

Treat as targeted kernel stability risk, not a confirmed internet-wide emergency. Prioritize remediation where affected Linux kernels run on DPAA2 Ethernet platforms, especially production network appliances or embedded systems requiring high availability.

Technical view

The TSO header buffer was DMA-unmapped before its virtual address was retrieved. The driver then attempted lookup after unmap and passed an invalid virtual address to kfree. The fix retrieves the virtual address with dpaa2_iova_to_virt() before dma_unmap().

Likely exposure

Exposure appears limited to Linux systems using the fsl_dpaa2_eth/dpaa2-eth driver on compatible DPAA2 Ethernet hardware, with affected 5.18-era kernels identified in the CVE data. The source bundle does not prove broader product exposure.

Exploitation context

The bundle reports no KEV listing and provides no cited evidence of active exploitation. It includes a kernel crash trace, suggesting practical impact may be local or traffic-triggered denial of service, but exploitation conditions are not fully documented.

Researcher notes

Evidence is sparse: no CVSS, CWE, exploit status, or detailed trigger conditions are provided. The technical root cause and fix direction are clear from the kernel description and stable commit references, but exposure assessment depends on hardware, driver use, and kernel branch.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the referenced stable fixes.
  • Prioritize systems using DPAA2 Ethernet hardware and the dpaa2-eth driver.
  • For custom kernels, verify the referenced kernel.org fixes are included.
  • Monitor kernel logs for dpaa2_eth and kfree paging fault traces.

Validation and detection

  • Inventory Linux hosts using fsl_dpaa2_eth or DPAA2 Ethernet hardware.
  • Compare running kernel versions against vendor advisories and fixed kernel builds.
  • Check custom kernel trees for the two referenced stable commits.
  • Review crash logs for dpaa2_eth_free_tx_fd, dpaa2_eth_tx_conf, or kfree faults.
Prepared
Confidence
medium
Sources
4

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-2022-49452 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
0ADP providers
3Source 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

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux3dc709e0cd47c602a8d1a6747f1a91e9737eeed3, 3dc709e0cd47c602a8d1a6747f1a91e9737eeed3unaffected
LinuxLinux5.18, 0, 5.18.3, 5.19affected
Weakness

CWE details

No CWE listed

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