Vulnerability CVE-2020-8428
Published: 2020-01-29

Description:
fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.

Type:

CWE-416

 (Use After Free)

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
3.6/10
4.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
Partial
Affected software
Linux -> Linux kernel 

 References:
http://www.openwall.com/lists/oss-security/2020/01/28/4
http://www.openwall.com/lists/oss-security/2020/02/02/1
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0cb50185ae942b03c4327be322055d622dc79f6
https://github.com/torvalds/linux/commit/d0cb50185ae942b03c4327be322055d622dc79f6
https://www.openwall.com/lists/oss-security/2020/01/28/2
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