#VU64944 Use-after-free in Linux kernel - CVE-2022-33981

Vulnerability identifier: #VU64944

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-33981

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 perform denial of service attack.

The vulnerability exists due to a use-after-free error in drivers/block/floppy.c in the Linux kernel when deallocating raw_cmd in the raw_cmd_ioctl function(). A local user can trigger use-after-free and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.17.6, 5.17.6

---

External links
https://github.com/torvalds/linux/commit/233087ca063686964a53c829d547c7571e3f67bf
https://seclists.org/oss-sec/2022/q2/66
https://exchange.xforce.ibmcloud.com/vulnerabilities/225362
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.6
https://bugzilla.redhat.com/show_bug.cgi?id=2099504

---

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.