CVE-2019-19338 — A flaw was found in the fix for CVE-2019-11135, in the Linux upstream kernel ver

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

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
[UNKNOWN]	Linux Kernel	before 5.5

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2020-07-13T16:04:00.000Z
• Last modified: 2024-08-05T02:16:46.895Z

09References

• www.openwall.com — https://www.openwall.com/lists/oss-security/2019/12/10/3
• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19338
• software.intel.com — https://software.intel.com/security-software-guidance/insights/deep-dive-intel-t…