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Review reviewHigh

CVE-2025-38533

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: net: libwx: fix the using of Rx buffer DMA The wx_rx_buffer structure contained two DMA address fields: 'dma' and 'page_dma'. However, only 'page_dma' was actually initialized and used to program the Rx descriptor. But 'dma' was uninitialized and used in some paths. This could lead to undefined behavior, including DMA errors or use-after-free, if the uninitialized 'dma' was used. Althrough such error has not yet occurred, it is worth fixing in the code.

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.08.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: libwx: fix the using of Rx buffer DMA The wx_rx_buffer structure contained two DMA address fields: 'dma' and 'page_dma'. However, only 'page_dma' was actually initialized and used to program the Rx descriptor. But 'dma' was uninitialized and used in some paths. This could lead to undefined behavior, including DMA errors or use-after-free, if the uninitialized 'dma' was used. Althrough such error has not yet occurred, it is worth fixing in the code.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 3c47e8ae113a68da47987750d9896e325d0aeedd < 027701180a7bcb64c42eab291133ef0c87b5b6c5, >= 3c47e8ae113a68da47987750d9896e325d0aeedd < ba7c793f96c1c2b944bb6f423d7243f3afc30fe9, >= 3c47e8ae113a68da47987750d9896e325d0aeedd < 05c37b574997892a40a0e9b9b88a481566b2367d, >= 3c47e8ae113a68da47987750d9896e325d0aeedd < 5fd77cc6bd9b368431a815a780e407b7781bcca0, >= 6.3, >= 6.3 < 6.6.100, >= 6.7 < 6.12.40, >= 6.13 < 6.15.8, 6.16
Fixed versions
6.6.100, 6.12.40, 6.15.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787