CVE-2026-46159: btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak
Published May 28, 2026
·Updated
btrfs: fix btrfsioctlspaceinfo() slotcount TOCTOU which can lead to info-leak
Affected Software
13 affected componentsFixes available
Linux Linux kernel (btrfs)
Linux Linux kernel>=2.6.34.1<6.6.140
Linux Linux kernel>=6.7<6.12.90
Linux Linux kernel>=6.13<6.18.32
Linux Linux kernel>=6.19<7.0.7
Linux Linux kernel=2.6.34
Linux Linux kernel=2.6.34-rc2
Linux Linux kernel=2.6.34-rc3
Linux Linux kernel=2.6.34-rc4
Linux Linux kernel=2.6.34-rc5
Linux Linux kernel=2.6.34-rc6
Linux Linux kernel=2.6.34-rc7
Microsoft azl3 kernel 6.6.139.1-1<6.6.141.1-1
6.6.141.1-1
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.141.1-1
Event History
May 28, 2026
CVE Published
via MITRE·09:36 AM
Data Sourced
via MITRE·09:36 AM
Description
Data Sourced
via NVD·10:16 AM
RemedyDescriptionSeverityWeaknessAffected Software
May 29, 2026
Data Sourced
via Microsoft·08:04 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·08:04 AM
Affected Software
Updated
via Microsoft·08:04 AM
DescriptionSeverity
Frequently Asked Questions
1
What is the severity of CVE-2026-46159?
The severity of CVE-2026-46159 is medium with a CVSS score of 5.5.
2
What type of vulnerability is CVE-2026-46159?
CVE-2026-46159 is a TOCTOU (Time of Check to Time of Use) race condition vulnerability that can lead to an information leak.
3
Which software versions are affected by CVE-2026-46159?
CVE-2026-46159 affects the Linux kernel, specifically the btrfs filesystem implementation.
4
How do I fix CVE-2026-46159?
To fix CVE-2026-46159, update to the patched version of the Linux kernel that resolves this TOCTOU vulnerability.
5
What impact does CVE-2026-46159 have on my system?
CVE-2026-46159 can expose sensitive information through an information leak due to the TOCTOU race condition.