CVE-2021-26930
First published: Wed Feb 17 2021(Updated: )
An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 | |
| Linux Kernel | >=3.11<=5.10.16 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Debian GNU/Linux | =9.0 |
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Reference Links
- http://xenbits.xen.org/xsa/advisory-365.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/
- https://security.netapp.com/advisory/ntap-20210326-0001/
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=871997bc9e423f05c7da7c9178e62dde5df2a7f8
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/
- https://launchpad.net/bugs/cve/CVE-2021-26930
- https://xenbits.xen.org/xsa/advisory-365.html
- https://security-tracker.debian.org/tracker/CVE-2021-26930
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26930
- https://nvd.nist.gov/vuln/detail/CVE-2021-26930
- https://ubuntu.com/security/CVE-2021-26930
Frequently Asked Questions
What are the potential impacts of CVE-2021-26930?
CVE-2021-26930 can lead to denial of service or memory corruption due to mishandling of grant references in the Linux kernel.
What is the severity of CVE-2021-26930?
CVE-2021-26930 is classified as a high severity vulnerability due to the risk of system instability.
Which versions of the Linux kernel are affected by CVE-2021-26930?
CVE-2021-26930 affects the Linux kernel versions from 3.11 through 5.10.16.
How do I fix CVE-2021-26930?
To mitigate CVE-2021-26930, update your Linux kernel to one of the fixed versions such as 5.10.223-1 or higher.
Is CVE-2021-26930 specific to any Linux distributions?
CVE-2021-26930 affects multiple distributions including Debian and Fedora, particularly versions using the affected Linux kernel.
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