CVE-2026-90260 Linux Kernel btrfs - Memory Corruption

Linux kernel btrfs zoned filesystem contains a memory corruption vulnerability caused by zeroing out extent buffer folios in btree_csum_one_bio(), letting attackers corrupt extent tree metadata, exploit requires use of zoned filesystems with specific write patterns.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Memory Corruption
Impact
Data Tampering, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for this issue.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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