CVE-2021-28964: Race Condition
First published: Mon Mar 22 2021(Updated: )
A race condition was discovered in get_old_root in fs/btrfs/ctree.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (BUG) because of a lack of locking on an extent buffer before a cloning operation, aka CID-dbcc7d57bffc.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=5.11.8 | |
| Red Hat Fedora | =32 | |
| Red Hat Fedora | =33 | |
| Red Hat Fedora | =34 | |
| Debian Linux | =9.0 | |
| NetApp Cloud Backup | ||
| NetApp SolidFire Baseboard Management Controller Firmware | ||
| All of | ||
| NetApp A250 Firmware | ||
| NetApp A250 Firmware | ||
| All of | ||
| NetApp FAS500F Firmware | ||
| NetApp FAS500F Firmware | ||
| NetApp A250 Firmware | ||
| NetApp A250 Firmware | ||
| NetApp FAS500F Firmware | ||
| NetApp FAS500F Firmware | ||
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
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Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dbcc7d57bffc0c8cac9dac11bec548597d59a6a5
- 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-2021-28964
- 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/dbcc7d57bffc0c8cac9dac11bec548597d59a6a5
- https://security-tracker.debian.org/tracker/CVE-2021-28964
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28964
- https://nvd.nist.gov/vuln/detail/CVE-2021-28964
- https://ubuntu.com/security/CVE-2021-28964
Frequently Asked Questions
What is the severity of CVE-2021-28964?
The severity of CVE-2021-28964 is classified as high due to its potential to cause denial of service.
How do I fix CVE-2021-28964?
To fix CVE-2021-28964, update to a patched version of the Linux kernel, such as 5.10.223-1 or later.
Which versions of the Linux kernel are affected by CVE-2021-28964?
CVE-2021-28964 affects the Linux kernel versions up to and including 5.11.8.
What types of systems are impacted by CVE-2021-28964?
CVE-2021-28964 impacts systems running unpatched versions of the Linux kernel, as well as specific Fedora and Debian distributions.
Is there a workaround for CVE-2021-28964?
There is no specific known workaround for CVE-2021-28964 besides applying the appropriate kernel updates.
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