CVE-2019-15791

Reference count underflow in shiftfs

State: Published
Severity: 7.1 High
Published: Apr 23, 2020
Updated: Sep 17, 2024
Reserved: Aug 29, 2019

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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H	canonical

Weaknesses

CWE-672 Operation on a Resource after Expiration or Release

Affected Products

Product	Versions
Shiftfs in the Linux kernelUbuntu	5.3.0-11.12 to before 5.3 kernel*Affectedfrom 5.3.0-22.24Not affected 5.0 kernel to before 5.0.0-35.38Affected

References

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