#VU39740 Buffer overflow in Linux kernel - CVE-2016-10154

Vulnerability identifier: #VU39740

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-2016-10154

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a local authenticated user to perform a denial of service (DoS) attack.

The smbhash function in fs/cifs/smbencrypt.c in the Linux kernel 4.9.x before 4.9.1 interacts incorrectly with the CONFIG_VMAP_STACK option, which allows local users to cause a denial of service (system crash or memory corruption) or possibly have unspecified other impact by leveraging use of more than one virtual page for a scatterlist.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.9

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External links
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06deeec77a5a689cc94b21a8a91a76e42176685d
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.1
https://www.openwall.com/lists/oss-security/2017/01/21/3
https://www.securityfocus.com/bid/95714
https://bugzilla.redhat.com/show_bug.cgi?id=1416104
https://github.com/torvalds/linux/commit/06deeec77a5a689cc94b21a8a91a76e42176685d

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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.