CVE-2019-19807: Use After Free
First published: Wed Nov 06 2019(Updated: )
A memory flaw was found in the ALSA subsystem of the Linux kernel. The struct snd_timer_instance function fails the timer->max_instances check leading to an invalid address. This could lead to a use-after-free vulnerability.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:3.10.0-1160.rt56.1131.el7 | 0:3.10.0-1160.rt56.1131.el7 |
| redhat/kernel | <0:3.10.0-1160.el7 | 0:3.10.0-1160.el7 |
| redhat/kernel-rt | <0:4.18.0-193.13.2.rt13.65.el8_2 | 0:4.18.0-193.13.2.rt13.65.el8_2 |
| redhat/kernel | <0:4.18.0-193.13.2.el8_2 | 0:4.18.0-193.13.2.el8_2 |
| redhat/kernel | <0:4.18.0-147.24.2.el8_1 | 0:4.18.0-147.24.2.el8_1 |
| Linux Kernel | >=4.9.199<4.9.201 | |
| Linux Kernel | >=4.14.152<4.14.154 | |
| Linux Kernel | >=4.19.82<4.19.84 | |
| Linux Kernel | >=5.2<5.3.11 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =16.04 | |
| Ubuntu Linux | =18.04 | |
| Ubuntu Linux | =19.10 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.13-1 | |
| Android | ||
| Ubuntu | =14.04 | |
| Ubuntu | =16.04 | |
| Ubuntu | =18.04 | |
| Ubuntu | =19.10 |
Remedy
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2019-19807 https://nvd.nist.gov/vuln/detail/CVE-2019-19807
- https://bugzilla.redhat.com/show_bug.cgi?id=1786078
- https://access.redhat.com/errata/RHSA-2020:4062
- https://access.redhat.com/errata/RHSA-2020:4060
- https://access.redhat.com/errata/RHSA-2020:3016
- https://access.redhat.com/errata/RHSA-2020:3010
- https://access.redhat.com/errata/RHSA-2020:3222
- https://access.redhat.com/security/cve/cve-2019-19807
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.11
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://github.com/torvalds/linux/commit/e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4225-1/
- https://usn.ubuntu.com/4227-1/
- https://usn.ubuntu.com/4227-2/
- https://launchpad.net/bugs/cve/CVE-2019-19807
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e7af6307a8a54f0b873960b32b6a644f2d0fbd97https://github.com/torvalds/linux/commit/e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1786080
- https://source.android.com/docs/security/bulletin/2020-04-01 (Advisory)
- https://git.kernel.org/linus/e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://security-tracker.debian.org/tracker/CVE-2019-19807
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19807
- https://nvd.nist.gov/vuln/detail/CVE-2019-19807
- https://ubuntu.com/security/CVE-2019-19807
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What vulnerability is identified by CVE-2019-19807?
CVE-2019-19807 is a use-after-free vulnerability in the ALSA subsystem of the Linux kernel due to a memory flaw in the struct snd_timer_instance function.
What is the severity of CVE-2019-19807?
CVE-2019-19807 has been classified as a Medium severity vulnerability.
How do I fix CVE-2019-19807?
To fix CVE-2019-19807, update the Linux kernel to version 5.3.11 or later, or apply the relevant patches provided by your Linux distribution.
Which Linux distributions are affected by CVE-2019-19807?
CVE-2019-19807 affects various Linux distributions including Red Hat, Ubuntu, and Debian prior to patched versions.
What are the conditions that lead to CVE-2019-19807 being exploited?
CVE-2019-19807 can be exploited when the ALSA subsystem is used in a specific way that bypasses the max_instances check, leading to memory corruption.
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