#VU104422 Use-after-free in Linux kernel - CVE-2022-49426

Vulnerability identifier: #VU104422

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-49426

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 arm_smmu_alloc_shared_cd(), kfree() and arm_smmu_free_shared_cd() functions in drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/9aa215450888cf29af0c479e14a712dc6b0c506c
https://git.kernel.org/stable/c/cbd23144f7662b00bcde32a938c4a4057e476d68
https://git.kernel.org/stable/c/e3cbbdbff8a4db5d053c53fd71be62ccccdb52b0
https://git.kernel.org/stable/c/fc90f13ea0dcd960e5002d204fa55cec4e0db2fa

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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.