CVE-2026-46159

medium Red Hat
CVSS v3 Base Score
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.0%
Exploitation probability in 30 days
Top 95% most likely to be exploited
Attack Characteristics
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: May 28, 2026 (43 days ago)
Last Modified: May 28, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in the btrfs filesystem within the Linux kernel. A Time-of-check to time-of-use (TOCTOU) race condition in the `btrfs_ioctl_space_info()` function allows a local attacker to exploit a timing window. This occurs when the system counts entries for allocation size and then fills a buffer, but a concurrent operation reduces the entry count between these two steps. Consequently, uninitialized kernel memory may be copied to userspace, leading to information disclosure.

CWE

CWE-367

Affected Products

Red Hat Enterprise Linux 10Red Hat Enterprise Linux 6Red Hat Enterprise Linux 7Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 lore.kernel.org