Answer in brief
CVE-2026-90260 records a High severity (CVSS 7.1) vulnerability in btrfs: zoned: don't clobber the extent buffer when zeroing it out. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=aa6313e6ff2bfbf736a2739047bba355d8241584 <92484ad014f2e2b0e0e7bbc1610951e978cf557c || >=aa6313e6ff2bfbf736a2739047bba355d8241584 <98e3747587f9f87f010d8d7e55786216249a94af || >=aa6313e6ff2bfbf736a2739047bba355d8241584 <db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c | 92484ad014f2e2b0e0e7bbc1610951e978cf557c, 98e3747587f9f87f010d8d7e55786216249a94af, db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c |
| Linux/Linuxgeneric | 6.8 | Not reported |
| Linux/Linuxgeneric | >=aa6313e6ff2bfbf736a2739047bba355d8241584 <efa5084d08030aa557fdefa3e4a73b2501b7d207 || >=aa6313e6ff2bfbf736a2739047bba355d8241584 <92484ad014f2e2b0e0e7bbc1610951e978cf557c || >=aa6313e6ff2bfbf736a2739047bba355d8241584 <98e3747587f9f87f010d8d7e55786216249a94af || >=aa6313e6ff2bfbf736a2739047bba355d8241584 <db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c | efa5084d08030aa557fdefa3e4a73b2501b7d207, 92484ad014f2e2b0e0e7bbc1610951e978cf557c, 98e3747587f9f87f010d8d7e55786216249a94af, db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.