#VU29958 Use-after-free in Linux kernel - CVE-2020-12464
Vulnerability identifier: #VU29958
Vulnerability risk: Low
CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID:
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 usb_sg_cancel() function in drivers/usb/core/message.c in the Linux kernel. A local user can trigger a use-after-free error during file transfer to USB driver and execute arbitrary code on the system with elevated privileges.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Linux kernel: 5.6.1 - 5.6.7
External links
https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.8
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=056ad39ee9253873522f6469c3364964a322912b
https://github.com/torvalds/linux/commit/056ad39ee9253873522f6469c3364964a322912b
https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
https://lkml.org/lkml/2020/3/23/52
https://patchwork.kernel.org/patch/11463781/
https://security.netapp.com/advisory/ntap-20200608-0001/
https://usn.ubuntu.com/4387-1/
https://usn.ubuntu.com/4388-1/
https://usn.ubuntu.com/4389-1/
https://usn.ubuntu.com/4390-1/
https://usn.ubuntu.com/4391-1/
https://www.debian.org/security/2020/dsa-4698
https://www.debian.org/security/2020/dsa-4699
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.
