---
id: CVE-2026-90266
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  btrfs: zoned: don't force read-only on transient -EAGAIN from reloc merge

  On a zoned FS, btrfs_delayed_refs_rsv_refill() returns -EAGAIN whenever
  the over-committed me…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  btrfs: zoned: don't force read-only on transient -EAGAIN from reloc merge

  On a zoned FS, btrfs_delayed_refs_rsv_refill() returns -EAGAIN whenever
  the over-committed me…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7bcb04de982ff0718870112ad9f38c35cbca528b <
    8249dfe46337d599e2087b772a2e32ef9f77282b
  - >-
    Linux >= 7bcb04de982ff0718870112ad9f38c35cbca528b <
    e549093c11a2fff8430df3dfbdb45eb9811a69a5
  - Linux 7.1
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:23.147'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90266'
references:
  - url: 'https://git.kernel.org/stable/c/8249dfe46337d599e2087b772a2e32ef9f77282b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e549093c11a2fff8430df3dfbdb45eb9811a69a5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.839Z'
epss: 0.00198
epssPercentile: 0.08433
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

btrfs: zoned: don't force read-only on transient -EAGAIN from reloc merge

On a zoned FS, btrfs_delayed_refs_rsv_refill() returns -EAGAIN whenever
the over-committed metadata plus the zone_unusable bytes exceeds the
usable size in a metadata block-group to avoid heavy over-commit of
metadata and early ENOSPC in one transaction.

If this happens while doing reclaim, the transaction is getting aborted.

Treat -EAGAIN as a soft, retryable condition in case of block-group
reclaim.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.