CVE-2020-27820: Use After Free
First published: Tue Nov 03 2020(Updated: )
A vulnerability was found in kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if "unbind" the driver).
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-372.9.1.rt7.166.el8 | 0:4.18.0-372.9.1.rt7.166.el8 |
| redhat/kernel | <0:4.18.0-372.9.1.el8 | 0:4.18.0-372.9.1.el8 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| Linux Kernel | >2.6.12<5.4.162 | |
| Linux Kernel | >5.5<5.10.82 | |
| Linux Kernel | >5.11<5.15.5 | |
| Linux Kernel | =2.6.12 | |
| Linux Kernel | =2.6.12-rc2 | |
| Linux Kernel | =2.6.12-rc3 | |
| Linux Kernel | =2.6.12-rc4 | |
| Linux Kernel | =2.6.12-rc5 | |
| Linux Kernel | =2.6.12-rc6 | |
| Fedora | =33 | |
| oracle communications Cloud native core binding support function | =22.1.3 | |
| oracle communications cloud native core network exposure function | =22.1.1 | |
| oracle communications Cloud native core policy | =22.2.0 | |
| Linux Kernel |
Remedy
To mitigate this issue, prevent the module nouveau from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-27820 https://nvd.nist.gov/vuln/detail/CVE-2020-27820 https://lore.kernel.org/dri-devel/20201103194912.184413-2-jcline@redhat.com/ https://lore.kernel.org/dri-devel/20201103194912.184413-3-jcline@redhat.com/ https://lore.kernel.org/dri-devel/20201103194912.184413-4-jcline@redhat.com/
- https://bugzilla.redhat.com/show_bug.cgi?id=1901726
- https://access.redhat.com/errata/RHSA-2022:1975
- https://access.redhat.com/errata/RHSA-2022:1988
- https://access.redhat.com/security/cve/cve-2020-27820
- https://lore.kernel.org/dri-devel/20201103194912.184413-2-jcline%40redhat.com/
- https://lore.kernel.org/dri-devel/20201103194912.184413-3-jcline%40redhat.com/
- https://lore.kernel.org/dri-devel/20201103194912.184413-4-jcline%40redhat.com/
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://launchpad.net/bugs/cve/CVE-2020-27820
- https://access.redhat.com/solutions/41278
- https://lore.kernel.org/dri-devel/20201103194912.184413-2-jcline@redhat.com/
- https://lore.kernel.org/dri-devel/20201103194912.184413-3-jcline@redhat.com/
- https://lore.kernel.org/dri-devel/20201103194912.184413-4-jcline@redhat.com/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1904039
- https://security-tracker.debian.org/tracker/CVE-2020-27820
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27820
- https://nvd.nist.gov/vuln/detail/CVE-2020-27820
- https://ubuntu.com/security/CVE-2020-27820
Frequently Asked Questions
What is the severity of CVE-2020-27820?
CVE-2020-27820 has been classified as a high severity vulnerability due to the potential for exploitation leading to denial of service.
How do I fix CVE-2020-27820?
To remediate CVE-2020-27820, you should upgrade to the patched versions of the kernel, specifically kernel-rt or kernel versions 0:4.18.0-372.9.1.rt7.166.el8 or 0:4.18.0-372.9.1.el8.
Which software is affected by CVE-2020-27820?
CVE-2020-27820 affects several versions of the Linux kernel, specifically versions between 2.6.12 and 5.15.5.
Is there a known workaround for CVE-2020-27820?
Currently, there are no effective workarounds recommended for CVE-2020-27820, and patching is the advised course of action.
What type of vulnerability is CVE-2020-27820?
CVE-2020-27820 is a use-after-free vulnerability that occurs in the nouveau driver's postclose() handler within the Linux kernel.
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