CVE-2026-90260
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, in the btrfs filesystem on zoned disks, btree_csum_one_bio() zeroed the extent buffer's folios before submission, destroying the in-memory buffer while it might still be referenced, leading to extent tree corruption. The fix writes zeros from a shared zero page, leaving the buffer content untouched.
Risk Assessment
Corruption of the btrfs filesystem on zoned disks may occur, risking data loss or system failure.
Recommendation
Install the updated Linux kernel with this fix to prevent extent tree corruption in btrfs on zoned disks.
Other vulnerabilities in Linux kernel
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: don't clobber the extent buffer when zeroing it out On a zoned filesystem a freed-but-still-dirty tree block is written out as zeros (EXTENT_BUFFER_ZONED_ZEROOUT) only to keep the zone write pointer advancing. btree_csum_one_bio() implemented this by memzeroing the extent buffer's own folios before submission. That destroys the in-memory buffer while it may still be referenced. In particular btrfs_free_tree_block() can run on it afterwards and reads the header to add a delayed reference; once the header has been zeroed it frees bytenr 0 and corrupts the extent tree (the btrfs_header_bytenr(buf) != 0 ASSERT in btrfs_free_tree_block(), or an "unable to find ref" abort). It is flaky and reproduces under fsstress, e.g. generic/461 and generic/013. Write the zeros to disk from the shared zero page instead and leave the extent buffer content untouched, so any later reference - including the delayed reference from btrfs_free_tree_block() - still sees a valid header. end_bbio_meta_write() now clears writeback on the buffer's own folios, as the bio no longer carries them.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS