CVE-2022-50545
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
There is a memory leaks reported by kmemleak:
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.
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Fix it by adding phy_disconnect() when removes one r6040 device or on error handling path after r6040_mii probed successfully.
Detalles técnicos trazas, registros y código del informe original
r6040: Fix kmemleak in probe and remove
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 problemCVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-401
Referencias
- https://git.kernel.org/stable/c/2ce242e1b9ad31c1f68496b3548e407a8cb2c07d
- https://git.kernel.org/stable/c/3d5f83a62e8235d235534b3dc6f197d8a822c269
- https://git.kernel.org/stable/c/5944c25c67de54e0aa53623e1e1af3bf8b16ed44
- https://git.kernel.org/stable/c/7e43039a49c2da45edc1d9d7c9ede4003ab45a5f
- https://git.kernel.org/stable/c/9b5b50329e2e966831a7237dd6949e7b5362a49a
- https://git.kernel.org/stable/c/a04707f4596952049da05756c27398c34d9a1d36
- https://git.kernel.org/stable/c/ad2c8f25457ca9a81e7e958148cbc26600ce3071
- https://git.kernel.org/stable/c/b0a61359026b57a287a48fbb4ba1d097023eca3e
- https://git.kernel.org/stable/c/b4448816e6a565e08236a6009c6bf48c6836cdfd
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nr6040: Fix kmemleak in probe and remove\n\nThere is a memory leaks reported by kmemleak:\n\n unreferenced object 0xffff888116111000 (size 2048):\n comm \"modprobe\", pid 817, jiffies 4294759745 (age 76.502s)\n hex dump (first 32 bytes):\n 00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff ................\n 08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00 ................\n backtrace:\n [<ffffffff815bcd82>] kmalloc_trace+0x22/0x60\n [<ffffffff827e20ee>] phy_device_create+0x4e/0x90\n [<ffffffff827e6072>] get_phy_device+0xd2/0x220\n [<ffffffff827e7844>] mdiobus_scan+0xa4/0x2e0\n [<ffffffff827e8be2>] __mdiobus_register+0x482/0x8b0\n [<ffffffffa01f5d24>] r6040_init_one+0x714/0xd2c [r6040]\n ...\n\nThe problem occurs in probe process as follows:\n r6040_init_one:\n mdiobus_register\n mdiobus_scan <- alloc and register phy_device,\n the reference count of phy_device is 3\n r6040_mii_probe\n phy_connect <- connect to the first phy_device,\n so the reference count of the first\n phy_device is 4, others are 3\n register_netdev <- fault inject succeeded, goto error handling path\n\n // error handling path\n err_out_mdio_unregister:\n mdiobus_unregister(lp->mii_bus);\n err_out_mdio:\n mdiobus_free(lp->mii_bus); <- the reference count of the first\n phy_device is 1, it is not released\n and other phy_devices are released\n // similarly, the remove process also has the same problem\n\nThe root cause is traced to the phy_device is not disconnected when\nremoves one r6040 device in r6040_remove_one() or on error handling path\nafter r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet\ndevice is connected to the first PHY device of mii_bus, in order to\nnotify the connected driver when the link status changes, which is the\ndefault behavior of the PHY infrastructure to handle everything.\nTherefore the phy_device should be disconnected when removes one r6040\ndevice or on error handling path.\n\nFix it by adding phy_disconnect() when removes one r6040 device or on\nerror handling path after r6040_mii probed successfully."
}
],
"lastModified": "2026-06-17T05:23:45.753",
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