TI-2019-11864 Aliases CVE-2019-15793 GHSA-h5g7-x752-wjh8

Mishandling of file-system uid/gid with namespaces in shiftfs

LOW 39CWE-538Published 2020-04-23 · Updated 2024-09-16

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.00685 52nd percentileScored 2026-11-07

Fix Fixed Shiftfs in the Linux kernel (Ubuntu): 5.0.0-35.38

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Ubuntu	Shiftfs in the Linux kernel	5.3.0-11.12 and later; 5.0 kernel to before 5.0.0-35.38	5.0.0-35.38	Patch available	CNA

Shiftfs in the Linux kernel VendorUbuntu Affected 5.3.0-11.12 and later; 5.0 kernel to before 5.0.0-35.38 Fixed in 5.0.0-35.38 Patch available CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel:5.0:::::::*	5.0	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:5.3:::::::*	5.3	Vulnerable	Linux
cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::	18.04	Vulnerable	Canonical
cpe:2.3:o:canonical:ubuntu_linux:19.04:::::::*	19.04	Vulnerable	Canonical

cpe:2.3:o:linux:linux_kernel:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:5.3:*:*:*:*:*:*:* Versions 5.3 Vulnerable ·Linux
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* Versions 19.04 Vulnerable ·Canonical

Remediation

Fix · CNA Shiftfs in the Linux kernel (Ubuntu) Fixed in 5.0.0-35.38

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2020-04-23
Ubuntu Shiftfs in the Linux kernel 5.0.0-35.38, 5.3 kernel*
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2019-11862 Reference count underflow in shiftfsPriority LOW 37
- TI-2019-11863 Type confusion in shiftfsPriority LOW 36
Show all 3 records →

Timeline

2026-10-02 Threatist record created from CVE-2019-15793
2026-10-03 Alias added: GHSA-h5g7-x752-wjh8

References

Patch 1

https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=3644b9d5688da86f18e017c9c580b75cf52927bb

Advisory 2

TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
TI-2007-05153 Stack-based buffer overflow in the cons_options function in options.c in dhcpd in OpenBSD… CVSS 2.0HIGH 7.2
TI-2004-01032 Multiple vulnerabilities in the IGMP functionality for Linux kernel 2.4.22 to 2.4.28, and… CVSS 2.0HIGH 10.0
TI-2004-00896 Multiple buffer overflows in libXML 2.6.12 and 2.6.13 (libxml2), and possibly other… CVSS 2.0HIGH 10.0
TI-2004-00800 Buffer overflow in the QFILEPATHINFO request handler in Samba 3.0.x through 3.0.7 may… CVSS 2.0HIGH 10.0
TI-2004-00962 Buffer overflow in the exif_read_data function in PHP before 4.3.10 and PHP 5.x up to… CVSS 2.0HIGH 10.0

See all 129 →

Sources

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