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cveRedhatCVE-2019-19338
HistoryJul 13, 2020 - 5:15 p.m.

CVE-2019-19338

2020-07-1317:15:11
CWE-385
CWE-203
redhat
web.nvd.nist.gov
214
cve-2019-19338
linux kernel
security vulnerability
data confidentiality
cascade lake cpus
tsx
speculative execution
taa
mds
nvd

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

29.4%

JSON

A flaw was found in the fix for CVE-2019-11135, in the Linux upstream kernel versions before 5.5 where, the way Intel CPUs handle speculative execution of instructions when a TSX Asynchronous Abort (TAA) error occurs. When a guest is running on a host CPU affected by the TAA flaw (TAA_NO=0), but is not affected by the MDS issue (MDS_NO=1), the guest was to clear the affected buffers by using a VERW instruction mechanism. But when the MDS_NO=1 bit was exported to the guests, the guests did not use the VERW mechanism to clear the affected buffers. This issue affects guests running on Cascade Lake CPUs and requires that host has ‘TSX’ enabled. Confidentiality of data is the highest threat associated with this vulnerability.

Affected configurations

Nvd
Vulners
Node
linuxlinux_kernelRange<5.5
Node
redhatenterprise_linuxMatch6.0
VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
redhatenterprise_linux6.0cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*

CNA Affected

[
  {
    "product": "Linux Kernel",
    "vendor": "[UNKNOWN]",
    "versions": [
      {
        "status": "affected",
        "version": "before 5.5"
      }
    ]
  }
]

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CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

29.4%

JSON
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