#VU92302 Use-after-free in Linux kernel - CVE-2021-47598

Vulnerability identifier: #VU92302

Vulnerability risk: Low

CVSSv4.0: [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-2021-47598

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 cake_init() function in net/sched/sch_cake.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
http://git.kernel.org/stable/c/4e388232e630ebe4f94b4a0715ec98c0e2b314a3
http://git.kernel.org/stable/c/0d80462fbdcafd536dcad7569e65d3d14a7e9f2f
http://git.kernel.org/stable/c/20ad1ef02f9ad5e1dda9eeb113e4c158b4806986
http://git.kernel.org/stable/c/f6deae2e2d83bd267e1986f5d71d8c458e18fd99
http://git.kernel.org/stable/c/ab443c53916730862cec202078d36fd4008bea79

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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.