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Vulnerability Details : CVE-2021-26932

An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one is reported to the backend driver, and the backend driver then loops over the results, performing follow-up actions based on the success or failure of each operation. Unfortunately, when running in PV mode, the Linux backend drivers mishandle this: Some errors are ignored, effectively implying their success from the success of related batch elements. In other cases, errors resulting from one batch element lead to further batch elements not being inspected, and hence successful ones to not be possible to properly unmap upon error recovery. Only systems with Linux backends running in PV mode are vulnerable. Linux backends run in HVM / PVH modes are not vulnerable. This affects arch/*/xen/p2m.c and drivers/xen/gntdev.c.
Publish Date : 2021-02-17 Last Update Date : 2021-03-31
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- CVSS Scores & Vulnerability Types

CVSS Score
1.9
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID CWE id is not defined for this vulnerability

- Products Affected By CVE-2021-26932

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
4 OS Linux Linux Kernel * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Fedoraproject Fedora 2
Linux Linux Kernel 1

- References For CVE-2021-26932

https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
MLIST [debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security update
https://security.netapp.com/advisory/ntap-20210326-0001/ CONFIRM
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
MLIST [debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update
http://xenbits.xen.org/xsa/advisory-361.html
https://lists.fedoraproject.org/archives/list/[email protected]/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/
FEDORA FEDORA-2021-8d45d297c6
https://lists.fedoraproject.org/archives/list/[email protected]/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/
FEDORA FEDORA-2021-7143aca8cb

- Metasploit Modules Related To CVE-2021-26932

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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