Is CVE-2019-15791 in the CISA KEV catalog?

No. CVE-2019-15791 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-15791?

CVE-2019-15791 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2019-15791?

CVE-2019-15791 has an EPSS score of 1.32% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-15791?

Upgrade linux-azure on ubuntu 18.04 to 5.0.0-1025.27~18.04.1 or later. Fixes are available for 21 affected products.

CVE & CISA-KEV Catalog

CVE-2019-15791

HIGH

7.1

CVSS v3

NVD

Description

In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, shiftfs_btrfs_ioctl_fd_replace() installs an fd referencing a file from the lower filesystem without taking an additional reference to that file. After the btrfs ioctl completes this fd is closed, which then puts a reference to that file, leading to a refcount underflow.

CWE-672 CWE-191

How to fix

Remediation Available

linux-azureUbuntu

Fixed in:5.0.0-1025.27~18.04.1USN-4184-1

linux-gcpUbuntu

Fixed in:5.0.0-1025.26~18.04.1USN-4184-1

linux-gke-5.0Ubuntu

Fixed in:5.0.0-1025.26~18.04.1USN-4184-1

linux-hweUbuntu

Fixed in:5.0.0-35.38~18.04.1USN-4184-1

linux-image-5.0.0-1025-azureUbuntu

Fixed in:5.0.0-1025.27~18.04.1USN-4184-1

linux-image-5.0.0-1025-gcpUbuntu

Fixed in:5.0.0-1025.26~18.04.1USN-4184-1

linux-image-5.0.0-1025-gkeUbuntu

Fixed in:5.0.0-1025.26~18.04.1USN-4184-1

linux-image-5.0.0-1027-oem-osp1Ubuntu

Fixed in:5.0.0-1027.31USN-4184-1

linux-image-5.0.0-35-genericUbuntu

Fixed in:5.0.0-35.38~18.04.1USN-4184-1

linux-image-5.0.0-35-generic-lpaeUbuntu

Fixed in:5.0.0-35.38~18.04.1USN-4184-1

linux-image-5.0.0-35-lowlatencyUbuntu

Fixed in:5.0.0-35.38~18.04.1USN-4184-1

linux-image-azureUbuntu

Fixed in:5.0.0.1025.36USN-4184-1

linux-image-gcpUbuntu

Fixed in:5.0.0.1025.29USN-4184-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.0.0.35.93USN-4184-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.0.0.35.93USN-4184-1

linux-image-gke-5.0Ubuntu

Fixed in:5.0.0.1025.14USN-4184-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.0.0.35.93USN-4184-1

linux-image-oem-osp1Ubuntu

Fixed in:5.0.0.1027.31USN-4184-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.0.0.35.93USN-4184-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.0.0.35.93USN-4184-1

linux-oem-osp1Ubuntu

Fixed in:5.0.0-1027.31USN-4184-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.32%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Patch1

git.launchpad.net

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.