Local denial of service in Linux kernel iommufd driver

1) Use-after-free

EUVDB-ID: #VU82759

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 - Use After Free

Exploit availability: No

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 - 6.3 rc6

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:6.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.3:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.3:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.3:rc6:*:*:*:*:*:*

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/

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.