CVE - CVE-2021-26932

CVE-ID
CVE-2021-26932	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://security.netapp.com/advisory/ntap-20210326-0001/ FEDORA:FEDORA-2021-7143aca8cb URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/ FEDORA:FEDORA-2021-8d45d297c6 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/ MISC:http://xenbits.xen.org/xsa/advisory-361.html MISC:https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ebee0eab08594b2bd5db716288a4f1ae5936e9bc MLIST:[debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update URL:https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html MLIST:[debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security update URL:https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
Assigning CNA
MITRE Corporation
Date Record Created
20210209	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210209)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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