In the Linux kernel, the following vulnerability has been resolved:
r6040: Fix kmemleak in probe and remove
There is a memory leaks reported by kmemleak:
unreferenced object 0xffff888116111000 (size 2048):
comm "modprobe", pid 817, jiffies 4294759745 (age 76.502s)
hex dump (first 32 bytes):
00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff ................
08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff815bcd82>] kmalloc_trace+0x22/0x60
[<ffffffff827e20ee>] phy_device_create+0x4e/0x90
[<ffffffff827e6072>] get_phy_device+0xd2/0x220
[<ffffffff827e7844>] mdiobus_scan+0xa4/0x2e0
[<ffffffff827e8be2>] __mdiobus_register+0x482/0x8b0
[<ffffffffa01f5d24>] r6040_init_one+0x714/0xd2c [r6040]
...
The problem occurs in probe process as follows:
r6040_init_one:
mdiobus_register
mdiobus_scan <- alloc and register phy_device,
the reference count of phy_device is 3
r6040_mii_probe
phy_connect <- connect to the first phy_device,
so the reference count of the first
phy_device is 4, others are 3
register_netdev <- fault inject succeeded, goto error handling path
// error handling path
err_out_mdio_unregister:
mdiobus_unregister(lp->mii_bus);
err_out_mdio:
mdiobus_free(lp->mii_bus); <- the reference count of the first
phy_device is 1, it is not released
and other phy_devices are released
// similarly, the remove process also has the same problem
The root cause is traced to the phy_device is not disconnected when
removes one r6040 device in r6040_remove_one() or on error handling path
after r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet
device is connected to the first PHY device of mii_bus, in order to
notify the connected driver when the link status changes, which is the
default behavior of the PHY infrastructure to handle everything.
Therefore the phy_device should be disconnected when removes one r6040
device or on error handling path.
Fix it by adding phy_disconnect() when removes one r6040 device or on
error handling path after r6040_mii probed successfully.
References
Configurations
Configuration 1 (hide)
|
History
04 Feb 2026, 19:13
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| References | () https://git.kernel.org/stable/c/2ce242e1b9ad31c1f68496b3548e407a8cb2c07d - Patch | |
| References | () https://git.kernel.org/stable/c/3d5f83a62e8235d235534b3dc6f197d8a822c269 - Patch | |
| References | () https://git.kernel.org/stable/c/5944c25c67de54e0aa53623e1e1af3bf8b16ed44 - Patch | |
| References | () https://git.kernel.org/stable/c/7e43039a49c2da45edc1d9d7c9ede4003ab45a5f - Patch | |
| References | () https://git.kernel.org/stable/c/9b5b50329e2e966831a7237dd6949e7b5362a49a - Patch | |
| References | () https://git.kernel.org/stable/c/a04707f4596952049da05756c27398c34d9a1d36 - Patch | |
| References | () https://git.kernel.org/stable/c/ad2c8f25457ca9a81e7e958148cbc26600ce3071 - Patch | |
| References | () https://git.kernel.org/stable/c/b0a61359026b57a287a48fbb4ba1d097023eca3e - Patch | |
| References | () https://git.kernel.org/stable/c/b4448816e6a565e08236a6009c6bf48c6836cdfd - Patch | |
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | CWE-401 |
07 Oct 2025, 16:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-10-07 16:15
Updated : 2026-02-04 19:13
NVD link : CVE-2022-50545
Mitre link : CVE-2022-50545
CVE.ORG link : CVE-2022-50545
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-401
Missing Release of Memory after Effective Lifetime