medium
6.9
CWE
362 416
Advisory Published
CVE Published
CVE Published
Updated

CVE-2021-3573: Race Condition

First published: Tue Jun 01 2021(Updated: )

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.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:3.10.0-1160.59.1.rt56.1200.el7
0:3.10.0-1160.59.1.rt56.1200.el7
redhat/kernel<0:3.10.0-1160.59.1.el7
0:3.10.0-1160.59.1.el7
redhat/kernel-rt<0:4.18.0-348.rt7.130.el8
0:4.18.0-348.rt7.130.el8
redhat/kernel<0:4.18.0-348.el8
0:4.18.0-348.el8
redhat/kernel<5.13
5.13
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1
Linux Kernel<5.13
Linux Kernel=5.13-rc1
Linux Kernel=5.13-rc2
Linux Kernel=5.13-rc3
Linux Kernel=5.13-rc4
Red Hat Enterprise Linux=6.0
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
Fedora=34

Remedy

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising easThe required privileges is CAP_NET_ADMIN capabilities. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.e of use and deployment, applicability to widespread installation base or stability.

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/commit/?id=e305509e678b3a4af2b3cfd410f409f7cdaabb52

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2021-3573?

    CVE-2021-3573 is classified as a high severity vulnerability due to its potential impact on the Linux kernel's HCI subsystem.

  • How do I fix CVE-2021-3573?

    To fix CVE-2021-3573, update your Linux kernel to version 0:3.10.0-1160.59.1.el7 or higher, or use the corresponding patched kernel versions for your distribution.

  • What versions of the Linux kernel are affected by CVE-2021-3573?

    CVE-2021-3573 affects various versions of the Linux kernel up to 5.13, including specific versions like 3.10.x and 4.18.x.

  • What types of systems are impacted by CVE-2021-3573?

    CVE-2021-3573 impacts systems running affected versions of the Linux kernel, such as Red Hat Enterprise Linux, Fedora, and Debian.

  • Is CVE-2021-3573 a zero-day vulnerability?

    No, CVE-2021-3573 is not a zero-day vulnerability as it has been publicly disclosed and patches are available.

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