CVE-2021-47612: nfc: fix segfault in nfc_genl_dump_devices_done

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-19 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: fix segfault in nfc_genl_dump_devices_done When kmalloc in nfc_genl_dump_devices() fails then nfc_genl_dump_devices_done() segfaults as below KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 25 Comm: kworker/0:1 Not tainted 5.16.0-rc4-01180-g2a987e65025e-dirty #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-6.fc35 04/01/2014 Workqueue: events netlink_sock_destruct_work RIP: 0010:klist_iter_exit+0x26/0x80 Call Trace: <TASK> class_dev_iter_exit+0x15/0x20 nfc_genl_dump_devices_done+0x3b/0x50 genl_lock_done+0x84/0xd0 netlink_sock_destruct+0x8f/0x270 __sk_destruct+0x64/0x3b0 sk_destruct+0xa8/0xd0 __sk_free+0x2e8/0x3d0 sk_free+0x51/0x90 netlink_sock_destruct_work+0x1c/0x20 process_one_work+0x411/0x710 worker_thread+0x6fd/0xa80

Affected products

Linux kernel: before 4.4.296; from 4.5 before 4.9.294; from 4.10 before 4.14.259; from 4.15 before 4.19.222; from 4.20 before 5.4.167; from 5.5 before 5.10.87 — fixed in 4.14.259, 4.19.222, 4.4.296, 4.9.294, 5.10.87, 5.15.10

How to fix

Upgrade to a fixed version: Linux kernel 4.14.259, 4.19.222, 4.4.296, 4.9.294. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-47612 or the next vulnerability affects your stack