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net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization Syzbot reported shift-out-of-bounds exception on MDIO bus initialization. The PHY address should be masked to 5 bits (0-31). Without this mask, invalid PHY addresses could be used, potentially causing issues with MDIO bus operations. Fix this by masking the PHY address with 0x1f (31 decimal) to ensure it stays within the valid range.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.12.44, 6.16.4
CVEs
CVE-2025-38736
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 15:07 UTC · Revision 1

Source evidence

net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization

core-osv · Original source

Published 5 Sept 2025, 17:20 UTC

In the Linux kernel, the following vulnerability has been resolved: net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization Syzbot reported shift-out-of-bounds exception on MDIO bus initialization. The PHY address should be masked to 5 bits (0-31). Without this mask, invalid PHY addresses could be used, potentially causing issues with MDIO bus operations. Fix this by masking the PHY address with 0x1f (31 decimal) to ensure it stays within the valid range.

osv:CVE-2025-38736

Kernel

Fixed versions: 6.12.44, 6.16.4

Complete source record
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  "id": "1009ce648fe2ee009cc711233a2108167280056ccee0928b32d1075fde377dcb",
  "url": "https://osv.dev/vulnerability/CVE-2025-38736",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: usb: asix_devices: Fix PHY address mask in MDIO bus initialization Syzbot reported shift-out-of-bounds exception on MDIO bus initialization. The PHY address should be masked to 5 bits (0-31). Without this mask, invalid PHY addresses could be used, potentially causing issues with MDIO bus operations. Fix this by masking the PHY address with 0x1f (31 decimal) to ensure it stays within the valid range.",
    "evidence": "osv:CVE-2025-38736",
    "products": [
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        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      ],
      "modified": "2026-10-28T02:30:36.750676061Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
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        "https://git.kernel.org/stable/c/fcb4ce9f729c1d08e53abf9d449340e24c3edee6",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38736.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38736",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
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    "related_cves": [
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 504014,
  "published_at": "2025-09-05T17:20:36.546+00:00"
}