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Vulnerability · Published Sep 17, 2026 · Assigned by Linux

CVE-2026-90266btrfs: zoned: don't force read-only on transient -EAGAIN from reloc merge

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 90.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:14linux7.2.6-1DEBIAN-CVE-2026-90266
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-90266
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-90266
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-90266

Affected products (as reported)

VendorProductVersions
Linux Linux 7bcb04de982ff0718870112ad9f38c35cbca528b – before 8249dfe46337d599e2087b772a2e32ef9f77282b7bcb04de982ff0718870112ad9f38c35cbca528b – before e549093c11a2fff8430df3dfbdb45eb9811a69a5
Linux Linux 7.1

References