CVE-2021-3573
Medium
Description
A use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system. This flaw affects the Linux kernel versions prior to 5.13-rc5.
SeverityMedium
CVSS6.4
Exploit probability—
Product
Linux Kernel
PublishedAug 13, 2021
First seenAug 13, 2021
Weakness typeCWE-362Race condition
How to fix
Update
- linux linux_kernel5.13 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 5.13, 5.13 | 5.13 |
| redhat enterprise_linux | 6.0, 7.0, 8.0 | — |
| fedoraproject fedora | 34 | — |
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