#VU59125 Out-of-bounds read in Linux kernel - CVE-2020-36386

Vulnerability identifier: #VU59125

Vulnerability risk: Low

CVSSv4.0: 4.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-36386

CWE-ID: CWE-125

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 gain access to sensitive information.

The vulnerability exists due to a boundary condition within the hci_extended_inquiry_result_evt() function in Linux kernel. A local user can tun a specially crafted program to trigger an out-of-bounds read error and read contents of memory on the system or crash the kernel.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.8 rc1 - 5.8.0

---

External links
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=51c19bf3d5cfaa66571e4b88ba2a6f6295311101
https://syzkaller.appspot.com/text?tag=ReproC&x=15ca2f46900000
https://sites.google.com/view/syzscope/kasan-slab-out-of-bounds-read-in-hci_extended_inquiry_result_evt
https://syzkaller.appspot.com/bug?id=4bf11aa05c4ca51ce0df86e500fce486552dc8d2

---

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.