suse-su-2021:1648-1
Vulnerability from csaf_suse
Published
2021-05-19 12:00
Modified
2021-05-19 12:00
Summary
Security update for xen

Notes

Title of the patch
Security update for xen
Description of the patch
This update for xen fixes the following issues: Security issue fixed: - CVE-2021-28689: Fixed some x86 speculative vulnerabilities with bare (non-shim) 32-bit PV guests (XSA-370) (bsc#1185104) - Make sure xencommons is in a format as expected by fillup. (bsc#1185682) Each comment needs to be followed by an enabled key. Otherwise fillup will remove manually enabled key=value pairs, along with everything that looks like a stale comment, during next pkg update - A recent systemd update caused a regression in xenstored.service systemd now fails to track units that use systemd-notify (bsc#1183790) - Added a delay between the call to systemd-notify and the final exit of the wrapper script (bsc#1185021, bsc#1185196)
Patchnames
SUSE-2021-1648,SUSE-OpenStack-Cloud-9-2021-1648,SUSE-OpenStack-Cloud-Crowbar-9-2021-1648,SUSE-SLE-SAP-12-SP4-2021-1648,SUSE-SLE-SERVER-12-SP4-LTSS-2021-1648
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).


To clipboard 

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          "text": "https://www.suse.com/security/cve/CVE-2021-28689"
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          "text": "x86: Speculative vulnerabilities with bare (non-shim) 32-bit PV guests 32-bit x86 PV guest kernels run in ring 1. At the time when Xen was developed, this area of the i386 architecture was rarely used, which is why Xen was able to use it to implement paravirtualisation, Xen\u0027s novel approach to virtualization. In AMD64, Xen had to use a different implementation approach, so Xen does not use ring 1 to support 64-bit guests. With the focus now being on 64-bit systems, and the availability of explicit hardware support for virtualization, fixing speculation issues in ring 1 is not a priority for processor companies. Indirect Branch Restricted Speculation (IBRS) is an architectural x86 extension put together to combat speculative execution sidechannel attacks, including Spectre v2. It was retrofitted in microcode to existing CPUs. For more details on Spectre v2, see: http://xenbits.xen.org/xsa/advisory-254.html However, IBRS does not architecturally protect ring 0 from predictions learnt in ring 1. For more details, see: https://software.intel.com/security-software-guidance/deep-dives/deep-dive-indirect-branch-restricted-speculation Similar situations may exist with other mitigations for other kinds of speculative execution attacks. The situation is quite likely to be similar for speculative execution attacks which have yet to be discovered, disclosed, or mitigated.",
          "title": "CVE description"
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      "threats": [
        {
          "category": "impact",
          "date": "2021-05-19T12:00:08Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2021-28689"
    }
  ]
}


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