#VU104794 Integer underflow in Linux kernel - CVE-2022-49650

Vulnerability identifier: #VU104794

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-2022-49650

CWE-ID: CWE-191

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 execute arbitrary code.

The vulnerability exists due to integer underflow within the bam_alloc_chan(), bam_free_chan(), bam_pause(), bam_resume(), bam_dma_irq(), bam_start_dma(), bam_dma_probe(), bam_dma_suspend() and bam_dma_resume() functions in drivers/dma/qcom/bam_dma.c. A local user can execute arbitrary code.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.18, 5.18 rc1, 5.18 rc2, 5.18 rc3, 5.18 rc5, 5.18 rc6, 5.18 rc7, 5.18 rc8, 5.18.1, 5.18.2, 5.18.3, 5.18.4, 5.18.5, 5.18.6, 5.18.7, 5.18.8, 5.18.9, 5.18.10

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External links
https://git.kernel.org/stable/c/0ac9c3dd0d6fe293cd5044cfad10bec27d171e4e
https://git.kernel.org/stable/c/2f6ded79068cac8cff41d5d5632564165d98ee12
https://git.kernel.org/stable/c/b702a1077b51fcb39507cc3bd39206f539319a96
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.11

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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.