#VU104405 Memory leak in Linux kernel - CVE-2021-47644

Vulnerability identifier: #VU104405

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47644

CWE-ID: CWE-401

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 a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the zoran_queue_init() function in drivers/staging/media/zoran/zoran_driver.c, within the zoran_check_jpg_settings(), zr36057_init(), dma_free_coherent() and zoran_remove() functions in drivers/staging/media/zoran/zoran_card.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.15, 5.15 rc1, 5.15 rc2, 5.15 rc3, 5.15 rc4, 5.15 rc5, 5.15 rc6, 5.15 rc7, 5.15.0, 5.15.1, 5.15.2, 5.15.3, 5.15.4, 5.15.5, 5.15.6, 5.15.7, 5.15.8, 5.15.9, 5.15.10, 5.15.11, 5.15.12, 5.15.13, 5.15.14, 5.15.15, 5.15.16, 5.15.17, 5.15.18, 5.15.19, 5.15.20, 5.15.21, 5.15.22, 5.15.23, 5.15.24, 5.15.25, 5.15.26, 5.15.27, 5.15.28, 5.15.29, 5.15.30, 5.15.31, 5.15.32

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External links
https://git.kernel.org/stable/c/1e501ec38796f43e995731d1bcd4173cb1ccfce0
https://git.kernel.org/stable/c/82e3a496eb56da0b9f29fdc5b63cedb3289e91de
https://git.kernel.org/stable/c/bd01629315ffd5b63da91d0bd529a77d30e55028
https://git.kernel.org/stable/c/c1ba65100a359fe28cfe37e09e10c99f247cbf1e
https://git.kernel.org/stable/c/ff3357bffd9fb78f59762d8955afc7382a279079
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.33

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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.