CVE-2018-19824 - Use After Free

Severity

46%

Complexity

39%

Confidentiality

106%

In the Linux kernel through 4.19.6, a local user could exploit a use-after-free in the ALSA driver by supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in sound/usb/card.c.

In the Linux kernel through 4.19.6, a local user could exploit a use-after-free in the ALSA driver by supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in sound/usb/card.c.

CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 4.6. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P).

Demo Examples

Use After Free

CWE-416

The following example demonstrates the weakness.


               
}
free(buf3R2);

Use After Free

CWE-416

The following code illustrates a use after free error:


               
}
free(ptr);
logError("operation aborted before commit", ptr);

When an error occurs, the pointer is immediately freed. However, this pointer is later incorrectly used in the logError function.

Overview

Type

Linux

First reported 6 years ago

2018-12-03 17:29:00

Last updated 5 years ago

2019-09-10 22:15:00

Affected Software

Linux Kernel

Canonical Ubuntu Linux 12.04 ESM (Extended Security Maintenance)

12.04

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

Canonical Ubuntu Linux 16.04 LTS (Long-Term Support)

16.04

Canonical Ubuntu Linux 18.04 LTS Edition

18.04

Canonical Ubuntu Linux 18.10

18.10

Debian Linux 8.0 (Jessie)

8.0

References

106109

Third Party Advisory, VDB Entry

RHSA-2019:2703

https://bugzilla.suse.com/show_bug.cgi?id=1118152

Issue Tracking, Patch, Third Party Advisory

https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=5f8cf712582617d523120df67d392059eaf2fc4b

Patch, Vendor Advisory

https://github.com/torvalds/linux/commit/5f8cf712582617d523120df67d392059eaf2fc4b

Patch, Vendor Advisory

[debian-lts-announce] 20190327 [SECURITY] [DLA 1731-1] linux security update

Mailing List, Third Party Advisory

[debian-lts-announce] 20190401 [SECURITY] [DLA 1731-2] linux regression update

Mailing List, Third Party Advisory

[debian-lts-announce] 20190503 [SECURITY] [DLA 1771-1] linux-4.9 security update

Mailing List, Third Party Advisory

https://support.f5.com/csp/article/K98155950

Third Party Advisory

USN-3879-1

Third Party Advisory

USN-3879-2

Third Party Advisory

USN-3930-1

Third Party Advisory

USN-3930-2

Third Party Advisory

USN-3931-1

Third Party Advisory

USN-3931-2

Third Party Advisory

USN-3933-1

Third Party Advisory

USN-3933-2

Third Party Advisory

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