A flaw was found in the Linux kernel’s implementation of biovecs in versions before 5.9-rc7. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block device, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25641
Reference (s):
- https://bugzilla.redhat.com/show_bug.cgi?id=1881424
- URL: https://bugzilla.redhat.com/show_bug.cgi?id=1881424
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e24969022cbd61ddc586f14824fc205661bb124
- URL: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e24969022cbd61ddc586f14824fc205661bb124
- https://www.kernel.org/doc/html/latest/block/biovecs.html