#VU90132 Use-after-free in Linux kernel - CVE-2021-47341

Vulnerability identifier: #VU90132

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-2021-47341

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 kvm_vm_ioctl_unregister_coalesced_mmio() function in virt/kvm/coalesced_mmio.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/f2ff9d03432fcb160e9f7d4be26174d89de2779a
http://git.kernel.org/stable/c/679837dc0abaa2c6e2a7bcd86483e05eee1d5066
http://git.kernel.org/stable/c/8d7c539316d652d217e5e82b89ee204c812a7061
http://git.kernel.org/stable/c/069d44a24c0ff8f85adf49233aae7a8ca16f5c7e
http://git.kernel.org/stable/c/23fa2e46a5556f787ce2ea1a315d3ab93cced204

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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.