CVE-2022-50545

published 2025-10-07

CVE-2022-50545: 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…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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:
[] kmalloc_trace+0x22/0x60
[] phy_device_create+0x4e/0x90
[] get_phy_device+0xd2/0x220
[] mdiobus_scan+0xa4/0x2e0
[] __mdiobus_register+0x482/0x8b0
[] r6040_init_one+0x714/0xd2c [r6040]
...

The problem occurs in probe process as follows:
r6040_init_one:
mdiobus_register
mdiobus_scan 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.

Affected

23 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.4-1 (bookworm)	linux 6.1.4-1 (bookworm)
linux	linux	—	—
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < a04707f4596952049da05756c27398c34d9a1d36	a04707f4596952049da05756c27398c34d9a1d36
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < b4448816e6a565e08236a6009c6bf48c6836cdfd	b4448816e6a565e08236a6009c6bf48c6836cdfd
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < 2ce242e1b9ad31c1f68496b3548e407a8cb2c07d	2ce242e1b9ad31c1f68496b3548e407a8cb2c07d
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < b0a61359026b57a287a48fbb4ba1d097023eca3e	b0a61359026b57a287a48fbb4ba1d097023eca3e
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < 3d5f83a62e8235d235534b3dc6f197d8a822c269	3d5f83a62e8235d235534b3dc6f197d8a822c269
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < 9b5b50329e2e966831a7237dd6949e7b5362a49a	9b5b50329e2e966831a7237dd6949e7b5362a49a
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < ad2c8f25457ca9a81e7e958148cbc26600ce3071	ad2c8f25457ca9a81e7e958148cbc26600ce3071
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < 5944c25c67de54e0aa53623e1e1af3bf8b16ed44	5944c25c67de54e0aa53623e1e1af3bf8b16ed44
linux	linux	>= 3831861b4ad8fd0ad7110048eb3e155628799d2b < 7e43039a49c2da45edc1d9d7c9ede4003ab45a5f	7e43039a49c2da45edc1d9d7c9ede4003ab45a5f
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 2.6.36 < 4.9.337	4.9.337
linux	linux_kernel	>= 4.10 < 4.14.303	4.14.303
linux	linux_kernel	>= 4.15 < 4.19.270	4.19.270
linux	linux_kernel	>= 4.20 < 5.4.229	5.4.229
linux	linux_kernel	>= 5.11 < 5.15.86	5.15.86
linux	linux_kernel	>= 5.16 < 6.0.16	6.0.16
linux	linux_kernel	>= 5.5 < 5.10.163	5.10.163
linux	linux_kernel	>= 6.1 < 6.1.2	6.1.2

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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