CVE & CISA-KEV Catalog

CVE-2019-15793

MEDIUM
6.5
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, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions.

CWE-538CWE-276

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
ScopeChanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

0.69%probability of exploitation in 30 days
48thpercentile

Moderate risk: more likely to be exploited than 48% of all known CVEs.

References

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.