CVE-2021-47180: NFC: nci: fix memory leak in nci_allocate_device
First published: Mon Mar 25 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: NFC: nci: fix memory leak in nci_allocate_device nfcmrvl_disconnect fails to free the hci_dev field in struct nci_dev. Fix this by freeing hci_dev in nci_free_device. BUG: memory leak unreferenced object 0xffff888111ea6800 (size 1024): comm "kworker/1:0", pid 19, jiffies 4294942308 (age 13.580s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 60 fd 0c 81 88 ff ff .........`...... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000004bc25d43>] kmalloc include/linux/slab.h:552 [inline] [<000000004bc25d43>] kzalloc include/linux/slab.h:682 [inline] [<000000004bc25d43>] nci_hci_allocate+0x21/0xd0 net/nfc/nci/hci.c:784 [<00000000c59cff92>] nci_allocate_device net/nfc/nci/core.c:1170 [inline] [<00000000c59cff92>] nci_allocate_device+0x10b/0x160 net/nfc/nci/core.c:1132 [<00000000006e0a8e>] nfcmrvl_nci_register_dev+0x10a/0x1c0 drivers/nfc/nfcmrvl/main.c:153 [<000000004da1b57e>] nfcmrvl_probe+0x223/0x290 drivers/nfc/nfcmrvl/usb.c:345 [<00000000d506aed9>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396 [<00000000bc632c92>] really_probe+0x159/0x4a0 drivers/base/dd.c:554 [<00000000f5009125>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740 [<000000000ce658ca>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:846 [<000000007067d05f>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431 [<00000000f8e13372>] __device_attach+0x122/0x250 drivers/base/dd.c:914 [<000000009cf68860>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491 [<00000000359c965a>] device_add+0x5be/0xc30 drivers/base/core.c:3109 [<00000000086e4bd3>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164 [<00000000ca036872>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238 [<00000000d40d36f6>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293 [<00000000bc632c92>] really_probe+0x159/0x4a0 drivers/base/dd.c:554
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.0<4.4.271 | |
| Linux Kernel | >=4.5<4.9.271 | |
| Linux Kernel | >=4.10<4.14.235 | |
| Linux Kernel | >=4.15<4.19.193 | |
| Linux Kernel | >=4.20<5.4.123 | |
| Linux Kernel | >=5.5<5.10.41 | |
| Linux Kernel | >=5.11<5.12.8 | |
| Linux Kernel | =5.13-rc1 | |
| Linux Kernel | =5.13-rc2 | |
| Linux Kernel | =5.13-rc3 |
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Reference Links
- https://git.kernel.org/stable/c/448a1cb12977f52142e6feb12022c59662d88dc1
- https://git.kernel.org/stable/c/4a621621c7af3cec21c47c349b30cd9c3cea11c8
- https://git.kernel.org/stable/c/2c2fb2df46ea866b49fea5ec7112ec3cd4896c74
- https://git.kernel.org/stable/c/0365701bc44e078682ee1224866a71897495c7ef
- https://git.kernel.org/stable/c/af2a4426baf71163c0c354580ae98c7888a9aba7
- https://git.kernel.org/stable/c/b34cb7ac32cc8e5471dc773180ea9ae676b1a745
- https://git.kernel.org/stable/c/65234f50a90b64b335cbb9164b8a98c2a0d031dd
- https://git.kernel.org/stable/c/e0652f8bb44d6294eeeac06d703185357f25d50b
Frequently Asked Questions
What is the severity of CVE-2021-47180?
CVE-2021-47180 is classified as a medium severity vulnerability due to the presence of a memory leak.
How do I fix CVE-2021-47180?
To fix CVE-2021-47180, users should upgrade to a patched version of the Linux kernel that addresses the memory leak in nci_allocate_device.
Which versions of the Linux kernel are affected by CVE-2021-47180?
CVE-2021-47180 affects multiple versions of the Linux kernel ranging from 4.0 to specific release candidates of 5.13.
What impact does CVE-2021-47180 have on my system?
CVE-2021-47180 can lead to a memory leak that may degrade system performance over time due to unfreed resources.
Is CVE-2021-47180 a critical vulnerability?
CVE-2021-47180 is not considered critical, but it should still be addressed to prevent potential resource exhaustion.
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