CVE-2021-26930 log

Source
Severity Medium
Remote No
Type Privilege escalation
Description
An issue was discovered in the Linux kernel 3.11 up to 5.10.17, 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.
Group Package Affected Fixed Severity Status Ticket
AVG-1613 linux-hardened 5.10.17.hardened1-1 Medium Vulnerable
AVG-1615 linux-lts 5.10.17-1 5.10.18-1 Medium Fixed
AVG-1614 linux-zen 5.11.zen2-2 5.11.1.zen1-1 Medium Fixed
AVG-1580 linux 5.11.arch2-1 5.11.1.arch1-1 Medium Fixed
References
https://xenbits.xen.org/xsa/advisory-365.html
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.11.1&id=1ef2744ab96362188ec61b5f9243161bab462126
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.18&id=00805af45a21729e2901a37914992786a0d32c46