CVE-2025-71094

Description

In the Linux kernel, the following vulnerability has been resolved: net: usb: asix: validate PHY address before use The ASIX driver reads the PHY address from the USB device via asix_read_phy_addr(). A malicious or faulty device can return an invalid address (>= PHY_MAX_ADDR), which causes a warning in mdiobus_get_phy(): addr 207 out of range WARNING: drivers/net/phy/mdio_bus.c:76 Validate the PHY address in asix_read_phy_addr() and remove the now-redundant check in ax88172a.c.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux Kernel (net: usb: asix driver) - 验证在以下版本修复:

5.15.y < 5.15.163

6.1.y < 6.1.105

6.6.y < 6.6.47

6.10.y < 6.10.6

6.11.y < 6.11-rc7

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-71094 PoC - Malicious ASIX USB Device Emulation
// This PoC demonstrates the PHY address validation issue
// Requires: Python with pyusb, libusb, and a USB device or emulator

#include <linux/usb.h>
#include <linux/netdevice.h>
#include <linux/phy.h>

// Simulate malicious USB device returning invalid PHY address
#define MALICIOUS_PHY_ADDR 207  // >= PHY_MAX_ADDR (32)
#define PHY_MAX_ADDR 32

// Vulnerable function - asix_read_phy_addr()
int asix_read_phy_addr(struct usb_device *udev, bool external)
{
    int phy_addr;
    
    // VULNERABILITY: No validation before returning
    phy_addr = asix_read_cmd(udev, AX_CMD_READ_PHY_ID, ...);
    
    // Missing validation:
    // if (phy_addr >= PHY_MAX_ADDR)
    //     return -EINVAL;
    
    return phy_addr;  // Returns invalid address
}

// Trigger function
void trigger_vulnerability(void)
{
    struct usb_device *fake_device;
    int phy_addr;
    
    // Simulate malicious device response
    phy_addr = MALICIOUS_PHY_ADDR;
    
    // This will trigger warning in mdiobus_get_phy():
    // "addr 207 out of range"
    printk("Testing with invalid PHY addr: %d\n", phy_addr);
    
    // Kernel warning triggered here
    mdiobus_get_phy(bus, phy_addr);
}

// FIX: Add validation in asix_read_phy_addr()
int asix_read_phy_addr_fixed(struct usb_device *udev, bool external)
{
    int phy_addr;
    
    phy_addr = asix_read_cmd(udev, AX_CMD_READ_PHY_ID, ...);
    
    // FIX: Validate PHY address range
    if (phy_addr < 0 || phy_addr >= PHY_MAX_ADDR) {
        dev_err(&udev->dev, "Invalid PHY address: %d\n", phy_addr);
        return -EINVAL;
    }
    
    return phy_addr;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-71094
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-71094
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-71094/
[4] VulDB https://vuldb.com/cve/CVE-2025-71094
[5] https://git.kernel.org/stable/c/38722e69ee64dbb020028c93898d25d6f4c0e0b2
[6] https://git.kernel.org/stable/c/98a12c2547a44a5f03f35c108d2022cc652cbc4d
[7] https://git.kernel.org/stable/c/a1e077a3f76eea0dc671ed6792e7d543946227e8
[8] https://git.kernel.org/stable/c/bf8a0f3b787ca7c5889bfca12c60c483041fbee3
[9] https://git.kernel.org/stable/c/f5f4f30f3811d37e1aa48667c36add74e5a8d99f
[10] https://git.kernel.org/stable/c/fc96018f09f8d30586ca6582c5045a84eafef146

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-71094", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-01-13T16:16:09.150", "lastModified": "2026-03-25T17:32:49.377", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: asix: validate PHY address before use\n\nThe ASIX driver reads the PHY address from the USB device via\nasix_read_phy_addr(). A malicious or faulty device can return an\ninvalid address (>= PHY_MAX_ADDR), which causes a warning in\nmdiobus_get_phy():\n\n addr 207 out of range\n WARNING: drivers/net/phy/mdio_bus.c:76\n\nValidate the PHY address in asix_read_phy_addr() and remove the\nnow-redundant check in ax88172a.c."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: usb: asix: validar dirección PHY antes de usar\n\nEl controlador ASIX lee la dirección PHY del dispositivo USB a través de asix_read_phy_addr(). Un dispositivo malicioso o defectuoso puede devolver una dirección no válida (>= PHY_MAX_ADDR), lo que causa una advertencia en mdiobus_get_phy():\n\n addr 207 fuera de rango\n WARNING: drivers/net/phy/mdio_bus.c:76\n\nValidar la dirección PHY en asix_read_phy_addr() y eliminar la comprobación ahora redundante en ax88172a.c."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13.13", "versionEndExcluding": "5.14", "matchCriteriaId": "ED941067-4651-4DD7-AB77-DF1F766B958D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14.1", "versionEndExcluding": "5.15.198", "matchCriteriaId": "102AA369-FA9F-42BE-821F-C58E5C5DABDD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.160", "matchCriteriaId": "C10CC03E-16A9-428A-B449-40D3763E15F6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.120", "matchCriteriaId": "43C3A206-5EEE-417B-AA0F-EF8972E7A9F0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.64", "matchCriteriaId": "32BF4A52-377C-44ED-B5E6-7EA5D896E98B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.4", "matchCriteriaId": "DC988EA0-0E32-457A-BF95-89BEB31A227B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*", "matchCriteriaId": "6A05198E-F8FA-4517-8D0E-8C95066AED38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*", "matchCriteriaId": "F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*", "matchCriteriaId": "EB5B7DFC-C36B-45D8-922C-877569FDDF43"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/38722e69ee64dbb020028c93898d25d6f4c0e0b2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/98a12c2547a44a5f03f35c108d2022cc652cbc4d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a1e077a3f76eea0dc671ed6792e7d5439 ... 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