CVE-2020-15852: An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port…

PriorityP337high7.8CVSS 3.1

AVLACLPRLUINSUCHIHAH

EPSS

0.33%

25.0th percentile

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

Affected

7 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.7.10-1 (bookworm)	linux 5.7.10-1 (bookworm)
linux	linux_kernel	>= 0 < 5.7.10-1	5.7.10-1
linux	linux_kernel	>= 0 < 5.7.10-1	5.7.10-1
linux	linux_kernel	>= 0 < 5.7.10-1	5.7.10-1
linux	linux_kernel	>= 0 < 5.7.10-1	5.7.10-1
linux	linux_kernel	5.5 – 5.7.9	—
xen	xen	<= 4.13.1	—

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvdv2.04.6MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P

osv7.8HIGH

vendor_debian7.8HIGH

vendor_redhat7.8HIGH

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