CVE-2021-38201: Buffer Overflow
First published: Sun Jun 13 2021(Updated: )
A flaw was found in the Linux kernel that allows remote attackers to cause a denial of service (xdr_set_page_base slab-out-of-bounds access) by performing many NFS 4.2 READ_PLUS operations. The highest threat from this vulnerability is to system availability.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-305.17.1.rt7.89.el8_4 | 0:4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel | <0:4.18.0-305.17.1.el8_4 | 0:4.18.0-305.17.1.el8_4 |
| redhat/Linux kernel | <5.14 | 5.14 |
| Linux Kernel | >=5.11.0<5.12.19 | |
| Linux Kernel | >=5.13.0<5.13.4 | |
| All of | ||
| netapp hci bootstrap os | ||
| netapp hci compute node | ||
| netapp hci management node | ||
| netapp solidfire | ||
| All of | ||
| NetApp Element Software | ||
| netapp hci storage node | ||
| Linux Kernel | <5.13.4 | |
| netapp hci bootstrap os | ||
| netapp hci compute node | ||
| NetApp Element Software | ||
| netapp hci storage node | ||
| 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 |
Remedy
Mitigation for this issue is either not available or the currently available options don't 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-2021-38201 https://nvd.nist.gov/vuln/detail/CVE-2021-38201
- https://bugzilla.redhat.com/show_bug.cgi?id=1992731
- https://access.redhat.com/errata/RHSA-2021:3440
- https://access.redhat.com/errata/RHSA-2021:3447
- https://access.redhat.com/security/cve/cve-2021-38201
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
- https://github.com/torvalds/linux/commit/6d1c0f3d28f98ea2736128ed3e46821496dc3a8c
- https://security.netapp.com/advisory/ntap-20210902-0010/
- https://launchpad.net/bugs/cve/CVE-2021-38201
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d1c0f3d28f98ea2736128ed3e46821496dc3a8c
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1992733
- https://git.kernel.org/linus/6d1c0f3d28f98ea2736128ed3e46821496dc3a8c
- https://security-tracker.debian.org/tracker/CVE-2021-38201
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38201
- https://nvd.nist.gov/vuln/detail/CVE-2021-38201
- https://ubuntu.com/security/CVE-2021-38201
Frequently Asked Questions
What is the severity of CVE-2021-38201?
CVE-2021-38201 has a high severity as it can lead to a denial of service and affect system availability.
How do I fix CVE-2021-38201?
To fix CVE-2021-38201, upgrade to kernel version 0:4.18.0-305.17.1.rt7.89.el8_4 or higher, or apply the relevant patches provided by your distribution.
Which versions are affected by CVE-2021-38201?
CVE-2021-38201 affects Linux kernel versions between 5.11.0 and 5.13.4, along with specific versions of Red Hat and Debian kernels.
Can I mitigate CVE-2021-38201 without patching?
Mitigation for CVE-2021-38201 may be limited, but best practices include limiting NFS operations or applying firewall rules to restrict access.
Is CVE-2021-38201 related to NFS operations?
Yes, CVE-2021-38201 is specifically related to multiple NFS 4.2 READ_PLUS operations triggering a denial of service vulnerability.
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