#VU82759 Use-after-free in Linux kernel - CVE-2023-33250

Vulnerability identifier: #VU82759

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-33250

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 privileged user to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the iopt_unmap_iova_range in drivers/iommu/iommufd/io_pagetable.c. A local privileged user can trigger a use-after-free error and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.3 rc1 - 6.3

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External links
https://groups.google.com/g/syzkaller/c/G6P9yecsTZ8/m/iiqFVOM9BwAJ
https://lore.kernel.org/linux-iommu/ZDabT%2FuRl%2FjxFhm0@ip-172-31-85-199.ec2.internal/T/
https://security.netapp.com/advisory/ntap-20230622-0006/

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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.