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 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.

• CWE-276

• http://www.openwall.com/lists/oss-security/2020/07/21/2Mailing List, Third Party Advisory
• http://xenbits.xen.org/xsa/advisory-329.htmlPatch, Third Party Advisory
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2Mailing List, Patch, Vendor Advisory
• https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2Patch, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20200810-0001/Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/21/2Mailing List, Third Party Advisory
• http://xenbits.xen.org/xsa/advisory-329.htmlPatch, Third Party Advisory
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2Mailing List, Patch, Vendor Advisory
• https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2Patch, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20200810-0001/Third Party Advisory

Published

Jul 20, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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