Bug 708196 (CVE-2020-8428, CVE-2020-8647, CVE-2020-8648, CVE-2020-8649)

Summary:	Kernel: multiple vulnerabilities (CVE-2020-{8428,8647,8648,8649})
Product:	Gentoo Security	Reporter:	filip ambroz <filip.ambroz>
Component:	Kernel	Assignee:	Gentoo Kernel Security <security-kernel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kernel
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8428
Whiteboard:	A?
Package list:		Runtime testing required:	---

Description filip ambroz 2020-02-04 10:36:58 UTC

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.

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

Comment 1 filip ambroz 2020-02-06 11:18:25 UTC

CVE-2020-8647:
https://nvd.nist.gov/vuln/detail/CVE-2020-8647
https://bugzilla.kernel.org/show_bug.cgi?id=206359

CVE-2020-8648:
https://nvd.nist.gov/vuln/detail/CVE-2020-8648
https://bugzilla.kernel.org/show_bug.cgi?id=206361

CVE-2020-8649:
https://nvd.nist.gov/vuln/detail/CVE-2020-8649
https://bugzilla.kernel.org/show_bug.cgi?id=206357

Comment 2 John Helmert III archtester

2021-12-19 01:14:50 UTC

Fixes at the latest merged for 5.5.9 and all long backported to stable trees.