This update for xen fixes the following issues :

CVE-2020-25602: Fixed an issue where there was a crash when handling guest access to MSR_MISC_ENABLE was thrown (bsc#1176339,XSA-333)

CVE-2020-25598: Added a missing unlock in XENMEM_acquire_resource error path (bsc#1176341,XSA-334)

CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)

CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)

CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)

CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)

CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)

CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)

CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)

CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)

Various other fixes (bsc#1027519)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for xen fixes the following issues :

CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)

CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)

CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)

CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)

CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)

CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)

CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)

CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)

CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets (bsc#1175534).

Various bug fixes (bsc#1027519)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in Xen through 4.14.x. The PCI passthrough code improperly uses register data.
    Code paths in Xen's MSI handling have been identified that act on unsanitized values read back from device     hardware registers. While devices strictly compliant with PCI specifications shouldn't be able to affect     these registers, experience shows that it's very common for devices to have out-of-spec backdoor     operations that can affect the result of these reads. A not fully trusted guest may be able to crash Xen,     leading to a Denial of Service (DoS) for the entire system. Privilege escalation and information leaks     cannot be excluded. All versions of Xen supporting PCI passthrough are affected. Only x86 systems are     vulnerable. Arm systems are not vulnerable. Only guests with passed through PCI devices may be able to     leverage the vulnerability. Only systems passing through devices with out-of-spec (backdoor)     functionality can cause issues. Experience shows that such out-of-spec functionality is common; unless you     have reason to believe that your device does not have such functionality, it's better to assume that it     does. (CVE-2020-25595)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
143707	SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:2791-1)	Nessus	SuSE Local Security Checks	2020/12/9	2022/5/11	high
143873	SUSE SLES12 Security Update : xen (SUSE-SU-2020:2787-1)	Nessus	SuSE Local Security Checks	2020/12/9	2022/5/11	high
259624	Linux Distros Unpatched Vulnerability : CVE-2020-25595	Nessus	Misc.	2025/8/30	2026/7/29	high

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