An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service or possibly gain privileges because of missing memory barriers in read-write unlock paths. The read-write unlock paths don't contain a memory barrier. On Arm, this means a processor is allowed to re-order the memory access with the preceding ones. In other words, the unlock may be seen by another processor before all the memory accesses within the "critical" section. As a consequence, it may be possible to have a writer executing a critical section at the same time as readers or another writer. In other words, many of the assumptions (e.g., a variable cannot be modified after a check) in the critical sections are not safe anymore. The read-write locks are used in hypercalls (such as grant-table ones), so a malicious guest could exploit the race. For instance, there is a small window where Xen can leak memory if XENMAPSPACE_grant_table is used concurrently. A malicious guest may be able to leak memory, or cause a hypervisor crash resulting in a Denial of Service (DoS). Information leak and privilege escalation cannot be excluded.

A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system availability.

Insufficient validation of untrusted input in clipboard in Google Chrome prior to 81.0.4044.92 allowed a local attacker to bypass site isolation via crafted clipboard contents.

Out of bounds read in WebSQL in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Use after free in extensions in Google Chrome prior to 81.0.4044.92 allowed an attacker who convinced a user to install a malicious extension to potentially exploit heap corruption via a crafted Chrome Extension.

Use after free in V8 in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Inappropriate implementation in developer tools in Google Chrome prior to 81.0.4044.92 allowed a remote attacker who had convinced the user to use devtools to potentially exploit heap corruption via a crafted HTML page.

Insufficient policy enforcement in trusted types in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to bypass content security policy via a crafted HTML page.

Insufficient policy enforcement in trusted types in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to bypass content security policy via a crafted HTML page.

Uninitialized use in WebRTC in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Insufficient data validation in developer tools in Google Chrome prior to 81.0.4044.92 allowed a remote attacker who had convinced the user to use devtools to execute arbitrary code via a crafted HTML page.

Inappropriate implementation in cache in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

Insufficient policy enforcement in omnibox in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to bypass security UI via a crafted HTML page.

Inappropriate implementation in extensions in Google Chrome prior to 81.0.4044.92 allowed an attacker who convinced a user to install a malicious extension to obtain potentially sensitive information via a crafted Chrome Extension.

Insufficient policy enforcement in navigations in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to bypass security UI via a crafted HTML page.

Insufficient policy enforcement in extensions in Google Chrome prior to 81.0.4044.92 allowed an attacker who convinced a user to install a malicious extension to obtain potentially sensitive information from process memory via a crafted Chrome Extension.

Inappropriate implementation in WebView in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to spoof security UI via a crafted application.

Use after free in window management in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Insufficient policy enforcement in extensions in Google Chrome prior to 81.0.4044.92 allowed a remote attacker who had compromised the renderer process to bypass navigation restrictions via a crafted HTML page.

Use after free in devtools in Google Chrome prior to 81.0.4044.92 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.