Linux Kernel up to 5.12.7 NFC nci_allocate_device memory leak

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 5.12.7. This affects the function nci_allocate_device of the component NFC. Executing a manipulation can lead to memory leak. This vulnerability appears as CVE-2021-47180. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.12.7. It has been declared as critical. This vulnerability affects the function nci_allocate_device of the component NFC. The manipulation with an unknown input leads to a memory leak vulnerability. The CWE definition for the vulnerability is CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. As an impact it is known to affect availability. CVE summarizes:

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: [] kmalloc include/linux/slab.h:552 [inline] [] kzalloc include/linux/slab.h:682 [inline] [] nci_hci_allocate+0x21/0xd0 net/nfc/nci/hci.c:784 [] nci_allocate_device net/nfc/nci/core.c:1170 [inline] [] nci_allocate_device+0x10b/0x160 net/nfc/nci/core.c:1132 [] nfcmrvl_nci_register_dev+0x10a/0x1c0 drivers/nfc/nfcmrvl/main.c:153 [] nfcmrvl_probe+0x223/0x290 drivers/nfc/nfcmrvl/usb.c:345 [] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396 [] really_probe+0x159/0x4a0 drivers/base/dd.c:554 [] driver_probe_device+0x84/0x100 drivers/base/dd.c:740 [] __device_attach_driver+0xee/0x110 drivers/base/dd.c:846 [] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431 [] __device_attach+0x122/0x250 drivers/base/dd.c:914 [] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491 [] device_add+0x5be/0xc30 drivers/base/core.c:3109 [] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164 [] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238 [] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293 [] really_probe+0x159/0x4a0 drivers/base/dd.c:554

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2021-47180. The exploitation appears to be difficult. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 239841 (TencentOS Server 4: kernel (TSSA-2024:0960)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.4.271, 4.9.271, 4.14.235, 4.19.193, 5.4.123, 5.10.41, 5.12.8 or 5.13 eliminates this vulnerability. Applying the patch 448a1cb12977/4a621621c7af/2c2fb2df46ea/0365701bc44e/af2a4426baf7/b34cb7ac32cc/65234f50a90b/e0652f8bb44d is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (239841) and CERT Bund (WID-SEC-2024-0699). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• EMC Avamar
• Dell NetWorker
• Open Source Linux Kernel
• IBM Spectrum Protect Plus

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.4.270
• 4.9.270
• 4.14.234
• 4.19.192
• 5.4.122
• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11
• 5.10.12
• 5.10.13
• 5.10.14
• 5.10.15
• 5.10.16
• 5.10.17
• 5.10.18
• 5.10.19
• 5.10.20
• 5.10.21
• 5.10.22
• 5.10.23
• 5.10.24
• 5.10.25
• 5.10.26
• 5.10.27
• 5.10.28
• 5.10.29
• 5.10.30
• 5.10.31
• 5.10.32
• 5.10.33
• 5.10.34
• 5.10.35
• 5.10.36
• 5.10.37
• 5.10.38
• 5.10.39
• 5.10.40
• 5.12.0
• 5.12.1
• 5.12.2
• 5.12.3
• 5.12.4
• 5.12.5
• 5.12.6
• 5.12.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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