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TI-2019-13950 Aliases CVE-2019-19338GHSA-qv7j-3q84-2q98

Observable discrepancy in [UNKNOWN] Linux Kernel

Priority LOW 25CWE-203Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 19 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-203.

Summary

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.

Why it matters now

EPSS 0.00475 41st percentileScored 2026-11-07
Fix Partial Linux Kernel ([UNKNOWN]): 5.5Red Hat: 5 advisoriesRed Hat: 19 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
[UNKNOWN]Linux Kernelbefore 5.55.5Patch availableCNA
  • Linux Kernel Vendor[UNKNOWN] Affected before 5.5 Fixed in 5.5 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*before 5.5VulnerableLinux
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.5 Vulnerable ·Linux
  • cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat

Remediation

  • Fix · CNA Linux Kernel ([UNKNOWN]) Fixed in 5.5

Red Hat 5 advisories

  • RHSA-2020:1465 Released 2020-04-14 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) bpftool-3.10.0-957.48.1.el7, kernel-3.10.0-957.48.1.el7, kernel-abi-whitelists-3.10.0-957.48.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.48.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.6) bpftool-3.10.0-957.48.1.el7, kernel-3.10.0-957.48.1.el7, kernel-abi-whitelists-3.10.0-957.48.1.el7 +11
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) kernel-debug-devel-3.10.0-957.48.1.el7, kernel-tools-libs-devel-3.10.0-957.48.1.el7
    • Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUS kernel-devel-3.10.0-957.48.1.el7, perf-3.10.0-957.48.1.el7, python-perf-3.10.0-957.48.1.el7
  • RHSA-2020:0834 Released 2020-03-17 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1062.18.1.el7, kernel-3.10.0-1062.18.1.el7, kernel-abi-whitelists-3.10.0-1062.18.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.18.1.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) bpftool-3.10.0-1062.18.1.el7, kernel-3.10.0-1062.18.1.el7, kernel-abi-whitelists-3.10.0-1062.18.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.18.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1062.18.1.el7, kernel-3.10.0-1062.18.1.el7, kernel-abi-whitelists-3.10.0-1062.18.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1062.18.1.el7, kernel-tools-libs-devel-3.10.0-1062.18.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1062.18.1.el7, kernel-3.10.0-1062.18.1.el7, kernel-abi-whitelists-3.10.0-1062.18.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.18.1.el7
  • RHSA-2020:0839 Released 2020-03-17 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Realtime (v. 7) kernel-rt-3.10.0-1062.18.1.rt56.1044.el7, kernel-rt-debug-3.10.0-1062.18.1.rt56.1044.el7, kernel-rt-debug-devel-3.10.0-1062.18.1.rt56.1044.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1062.18.1.rt56.1044.el7, kernel-rt-debug-3.10.0-1062.18.1.rt56.1044.el7, kernel-rt-debug-devel-3.10.0-1062.18.1.rt56.1044.el7 +7
Show 2 more Red Hat advisories
  • RHSA-2020:0339 Released 2020-02-04 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-147.5.1.el8_1
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-147.5.1.el8_1, kernel-4.18.0-147.5.1.el8_1, kernel-abi-whitelists-4.18.0-147.5.1.el8_1 +19
  • RHSA-2020:0328 Released 2020-02-04 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-147.5.1.rt24.98.el8_1, kernel-rt-core-4.18.0-147.5.1.rt24.98.el8_1, kernel-rt-debug-4.18.0-147.5.1.rt24.98.el8_1 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-147.5.1.rt24.98.el8_1, kernel-rt-core-4.18.0-147.5.1.rt24.98.el8_1, kernel-rt-debug-4.18.0-147.5.1.rt24.98.el8_1 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2020:0339
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2020:0339
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6)Fixed RHSA-2020:1465
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6)Fixed RHSA-2020:1465
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2020:0328
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2020:0328
Red Hat Enterprise Linux Realtime (v. 7)Fixed RHSA-2020:0839
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2020:1465
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux Server Optional EUS (v. 7.6)Fixed RHSA-2020:1465
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:0834
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2020:0839
Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUSFixed RHSA-2020:1465
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise MRG 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-19338
  2. 2026-10-03 Alias added: GHSA-qv7j-3q84-2q98

References

Patch 2

Advisory 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences