CVE-2019-19770

2019-12-1200:00:00

ubuntu.com

8.2 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

6.4 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:N/A:P

0.002 Low

EPSS

Percentile

60.5%

JSON

DISPUTED In the Linux kernel 4.19.83, there is a use-after-free
(read) in the debugfs_remove function in fs/debugfs/inode.c (which is used
to remove a file or directory in debugfs that was previously created with a
call to another debugfs function such as debugfs_create_file). NOTE: Linux
kernel developers dispute this issue as not being an issue with debugfs,
instead this is an issue with misuse of debugfs within blktrace.

Bugs

<https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1904471>

Notes

Author	Note
sbeattie	reproducer in github link according to kernel maintainer, needed commits are: (1b0b28364816) blktrace: break out of blktrace setup on concurrent calls (c3dbe541ef77) blktrace: Avoid sparse warnings when assigning q->blk_trace (a67549c8e568) blktrace: annotate required lock on do_blk_trace_setup() (bad8e64fb19d) blktrace: fix debugfs use after free (b431ef837e33) blktrace: ensure our debugfs dir exists

Author

Note

sbeattie

reproducer in github link according to kernel maintainer, needed commits are: (1b0b28364816) blktrace: break out of blktrace setup on concurrent calls (c3dbe541ef77) blktrace: Avoid sparse warnings when assigning q->blk_trace (a67549c8e568) blktrace: annotate required lock on do_blk_trace_setup() (bad8e64fb19d) blktrace: fix debugfs use after free (b431ef837e33) blktrace: ensure our debugfs dir exists

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-129.132UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-51.56UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1091.96UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1028.29UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1028.29~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1091.96~16.04.1UNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1031.32UNKNOWN
ubuntu14.04noarchlinux-azure< 4.15.0-1103.114~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchlinux-azure< 4.15.0-1103.114~16.04.1UNKNOWN
ubuntu18.04noarchlinux-azure-4.15< 4.15.0-1103.114UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-129.132	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-51.56	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1091.96	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1028.29	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1028.29~18.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-aws-hwe	< 4.15.0-1091.96~16.04.1	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1031.32	UNKNOWN
ubuntu	14.04	noarch	linux-azure	< 4.15.0-1103.114~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	linux-azure	< 4.15.0-1103.114~16.04.1	UNKNOWN
ubuntu	18.04	noarch	linux-azure-4.15	< 4.15.0-1103.114	UNKNOWN