#VU70485 Out-of-bounds read in Linux kernel - CVE-2022-47940

Vulnerability identifier: #VU70485

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-47940

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in smb2_write in fs/ksmbd/smb2pdu.c. A remote user can trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.18.18, 5.18.18

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External links
https://github.com/torvalds/linux/commit/158a66b245739e15858de42c0ba60fcf3de9b8e6
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=158a66b245739e15858de42c0ba60fcf3de9b8e6
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.18
https://www.openwall.com/lists/oss-security/2022/12/23/10
https://www.zerodayinitiative.com/advisories/ZDI-22-1691/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.