Bug 1966578 (CVE-2021-3573) - CVE-2021-3573 kernel: use-after-free in function hci_sock_bound_ioctl()
Summary: CVE-2021-3573 kernel: use-after-free in function hci_sock_bound_ioctl()
Status: NEW
Alias: CVE-2021-3573
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1968211 1968212 1968214 1968215 1968358 1968359 1968360 1968361 1968213 1968216 1969475
Blocks: 1966136 1972622
TreeView+ depends on / blocked
Reported: 2021-06-01 12:42 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-09-15 05:46 UTC (History)
43 users (show)

Fixed In Version: kernel 5.13-rc5
Doc Type: If docs needed, set a value
Doc Text:
A flaw 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.
Clone Of:
Last Closed:

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Description Guilherme de Almeida Suckevicz 2021-06-01 12:42:02 UTC
A use-after-free vulnerability was found in the Linux kernel in function hci_sock_bound_ioctl(). It can allow attackers to corrupt kernel heaps (kmalloc-8k to be specific) and adopt further exploitations.

Comment 4 Guilherme de Almeida Suckevicz 2021-06-08 13:50:59 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1969475]

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