CVE-2021-28971: Null Pointer Dereference
First published: Mon Mar 22 2021(Updated: )
A flaw was found in the Linux kernel. On some Haswell CPUs, userspace applications (such as perf-fuzzer) can cause a system crash because the PEBS status in a PEBS record is mishandled.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-348.rt7.130.el8 | 0:4.18.0-348.rt7.130.el8 |
| redhat/kernel | <0:4.18.0-348.el8 | 0:4.18.0-348.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 | <=5.11.8 | |
| Fedora | =32 | |
| Fedora | =33 | |
| Fedora | =34 | |
| Debian | =9.0 | |
| netapp cloud backup | ||
| netapp solidfire baseboard management controller firmware | ||
| All of | ||
| netapp aff a250 firmware | ||
| netapp aff a250 | ||
| All of | ||
| netapp aff 500f firmware | ||
| netapp aff 500f | ||
| netapp aff a250 firmware | ||
| netapp aff a250 | ||
| netapp aff 500f firmware | ||
| netapp aff 500f |
Remedy
Mitigation for this issue is either not available or the currently available options does not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-28971 https://nvd.nist.gov/vuln/detail/CVE-2021-28971
- https://bugzilla.redhat.com/show_bug.cgi?id=1941784
- https://access.redhat.com/errata/RHSA-2021:4140
- https://access.redhat.com/errata/RHSA-2021:4356
- https://access.redhat.com/security/cve/cve-2021-28971
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d88d05a9e0b6d9356e97129d4ff9942d765f46ea
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4VCKIOXCOZGXBEZMO5LGGV5MWCHO6FT3/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PTRNPQTZ4GVS46SZ4OBXY5YDOGVPSTGQ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/
- https://security.netapp.com/advisory/ntap-20210430-0003/
- https://launchpad.net/bugs/cve/CVE-2021-28971
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1941785
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4VCKIOXCOZGXBEZMO5LGGV5MWCHO6FT3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PTRNPQTZ4GVS46SZ4OBXY5YDOGVPSTGQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/
- https://git.kernel.org/linus/d88d05a9e0b6d9356e97129d4ff9942d765f46ea
- https://security-tracker.debian.org/tracker/CVE-2021-28971
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28971
- https://nvd.nist.gov/vuln/detail/CVE-2021-28971
- https://ubuntu.com/security/CVE-2021-28971
Frequently Asked Questions
What is the severity of CVE-2021-28971?
CVE-2021-28971 is classified as a high severity vulnerability due to its potential to cause system crashes on vulnerable systems.
How do I fix CVE-2021-28971?
To fix CVE-2021-28971, update your Linux kernel to at least version 0:4.18.0-348.rt7.130.el8 or a later patched version.
Which systems are affected by CVE-2021-28971?
CVE-2021-28971 affects specific Linux kernel versions running on Haswell CPUs.
Can CVE-2021-28971 lead to data loss?
Yes, if exploited, CVE-2021-28971 can potentially lead to data loss due to system crashes.
Is there a known exploit for CVE-2021-28971?
As of now, there are no public exploits specifically targeting CVE-2021-28971 reported.
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