btrfs: zoned: flush active metadata block group at btree_writepages() start
In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: flush active metadata block group at btree_writepages() start btree_writepages() writes the btree inode's dirty metadata in ascending logical address order. On a zoned filesystem only one metadata and one system block group is active for writing at a time, and check_bg_is_active() (via btrfs_check_meta_write_pointer()) pivots the active block group as writeback moves from one block group to the next. If the active block group sits at a higher logical address than another block group that also holds dirty metadata, the ascending walk reaches the lower one first and, to write it, has to finish the active block group and activate the lower one. It cannot finish a block group that still has unsent IO, and during WB_SYNC_ALL && !for_sync (commit) writeback it deliberately refuses to wait for that IO under fs_info->zoned_meta_io_lock, as that can deadlock. The pivot thus cannot issue the submission itself either, so it gives up: btrfs_check_meta_write_pointer() returns -EAGAIN, which btrfs_write_and_wait_transaction() treats as fatal and aborts the transaction, forcing the filesystem read-only. This happens intermittently under metadata-heavy relocation (e.g. fstests btrfs/187). Flush the active metadata and system block groups at the start of btree_writepages(), under the fs_info->zoned_meta_io_lock it already holds, so they have no unsent IO left and the later pivot can finish them and make forward
CVE-2026-90261
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90261
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
"lessThan": "58b0ab0340ce04a057169d42cbacbf786063813d",
"versionType": "git"
},
{
"status": "affected",
"version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
"lessThan": "e2de2989adb3e58c2320e57c255f52e065667b5e",
"versionType": "git"
},
{
"status": "affected",
"version": "13bb483d32abb6f8ebd40141d87eb68f11cc2dd2",
"lessThan": "ecc05eda9a346848ae01a6c8bfa3f0bec133bd8b",
"versionType": "git"
},
{
"status": "affected",
"version": "fca3a1cd3ba47f1815e0c0fcdc9aafaf02ee0a75",
"versionType": "git"
},
{
"status": "affected",
"version": "6.5.5",
"lessThan": "6.6",
"versionType": "semver"
}
],
"programFiles": [
"fs/btrfs/extent_io.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/btrfs/extent_io.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90261
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36624 · Revision 1
- Added to Heist Feed
- Publisher date