#VU90242 Use-after-free in Linux kernel - CVE-2021-47078

Vulnerability identifier: #VU90242

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-2021-47078

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 rxe_qp_init_req(), rxe_qp_init_resp() and rxe_qp_from_init() functions in drivers/infiniband/sw/rxe/rxe_qp.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/c65391dd9f0a47617e96e38bd27e277cbe1c40b0
https://git.kernel.org/stable/c/6a8086a42dfbf548a42bf2ae4faa291645c72c66
https://git.kernel.org/stable/c/f3783c415bf6d2ead3d7aa2c38802bbe10723646
https://git.kernel.org/stable/c/a62225d951d77eb20208fed8fc199e0c9b1df08b
https://git.kernel.org/stable/c/2ee4d79c364914989c80de382c0b1a7259a7e4b3
https://git.kernel.org/stable/c/03344e843ab6dd3b3f2cadfb65ed910590856c70
https://git.kernel.org/stable/c/67f29896fdc83298eed5a6576ff8f9873f709228

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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.