CVE-2026-98080: btrfs: do not force reloc root creation during qgroup_account_snapshot()
Published Sep 25, 2026
·Updated
btrfs: do not force reloc root creation during qgroupaccountsnapshot()
Affected Software
11 affected componentsFixes available
Linux Linux kernel
Linux Linux kernel>=4.14.45<4.15
Linux Linux kernel>=4.16.13<5.10.271
Linux Linux kernel>=5.11<5.15.222
Linux Linux kernel>=6.0<6.1.189
Linux Linux kernel>=6.2<6.6.158
Linux Linux kernel>=6.7<6.12.111
Linux Linux kernel>=6.13<6.18.53
Linux Linux kernel>=6.19<7.2.7
Linux Linux kernel=7.3-rc1
Microsoft azl3 kernel 6.6.157.1-1<6.6.158.1-1
6.6.158.1-1
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 6.6.158.1-1
Event History
Sep 25, 2026
CVE Published
via MITRE·10:24 AM
Data Sourced
via MITRE·10:24 AM
Description
Data Sourced
via NVD·11:17 AM
RemedyDescriptionSeverityWeaknessAffected Software
Sep 28, 2026
Data Sourced
via Microsoft·09:18 AM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
Which systems are most likely to encounter this issue?
The reported trigger is a Btrfs filesystem with quotas enabled, using MKFS_OPTIONS="-O quota", while running the btrfs/252 test. The failure occurs during metadata block-group relocation in snapshot quota accounting.
2
How can I tell whether the issue has occurred?
Affected systems can emit a kernel warning from lookup_inline_extent_backref in fs/btrfs/extent-tree.c during relocation. The filesystem may then be switched to read-only mode.