Vulnerability identifier: #VU90139

Vulnerability risk: Low

CVSSv3.1: 7.7 [AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47379

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the spin_lock_irq() and blkcg_deactivate_policy() functions in block/blk-cgroup.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

---

External links
http://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08
http://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf
http://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb
http://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.