About this tag
Btrfs (B-tree filesystem) is a Linux copy-on-write filesystem that supports snapshots, subvolumes, and advanced data management. On WindowsForum.com, discussions cover Btrfs vulnerabilities (CVE-2026-53284, CVE-2026-46129, CVE-2026-43118, CVE-2026-31519, CVE-2024-23850) affecting transaction cleanup, double-free errors, crash replay, and subvolume dentry races. Topics also include using Btrfs snapshots for safe update rollbacks, and Microsoft's Azure Linux remediation for CVE-2025-38260. These threads are relevant for Windows users running Linux VMs, WSL, NAS appliances, or container hosts where Btrfs is deployed.
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    Linux 7.2-rc1 Review: AMD HDMI 2.1, Intel Xe Platforms, Rust ZerroCopy & More

    Linus Torvalds released Linux 7.2-rc1 on Sunday, June 28, 2026, opening the public stabilization phase for the next mainline Linux kernel after two weeks of merge-window work following Linux 7.1. The release is not a finished kernel, and that distinction matters. What arrived this weekend is...
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    • amd gpu amdgpu display btrfs linux kernel ntfs compatibility rust in linux scheduler performance
    • Replies: 1
    • Forum: Windows News
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    CVE-2026-53284 Btrfs Bug: Transaction Cleanup Fails, Forcing Read-Only

    CVE-2026-53284 is a newly published Linux kernel vulnerability in Btrfs, disclosed in the NVD on June 26, 2026 and modified on June 28, that fixes a transaction writeback bug where dirty metadata tracking could be cleared after failed writes, leaving cleanup code unable to release dirty extent...
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    • btrfs cve 2026 linux kernel storage availability
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    • Forum: Security Alerts
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    CVE-2026-46129 Btrfs Double-Free Fix: Linux Kernel Patch Needed

    CVE-2026-46129 is a Linux kernel vulnerability published by NVD on May 28, 2026, after kernel.org reported a Btrfs double-free bug in the create_space_info() error path, where failed sysfs kobject setup can trigger cleanup of the same allocation twice. The flaw is narrow, technical, and...
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    • btrfs cve-2026-46129 linux kernel sysfs kobject
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    • Forum: Security Alerts
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    CVE-2026-43118 Btrfs Bug: Truncate Files May Reappear After Crash Replay

    CVE-2026-43118 is a Linux kernel Btrfs vulnerability published on May 6, 2026, in which log replay after a crash can restore a truncated file with its old non-zero size under a specific fsync, hardlink, or rename sequence. That sounds like a narrow filesystem corner case because it is one. But...
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    • btrfs crash consistency data integrity linux kernel security
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    • Forum: Security Alerts
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    Btrfs CVE-2026-31519: broken subvolume dentries cause ENOENT and possible abort

    Background A newly published Linux kernel CVE is drawing attention to a subtle but very real Btrfs failure mode: subvolumes can wind up with broken dentries, making them appear present to the VFS while behaving like dead entries underneath. In the reported scenario, ls shows a subvolume name in...
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    • btrfs dentry cache linux kernel cve orphan cleanup
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    • Forum: Security Alerts
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    How Linux Btrfs Snapshots Make Updates Safe to Roll Back

    There is a reason so many Linux users stop flinching at the sight of an update prompt: filesystem snapshots turn software updates from a gamble into a reversible action. Instead of hoping a patch lands cleanly, the system can preserve a working state first and let you roll back in minutes if...
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    • btrfs linux snapshots snapper windows update rollback
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    • Forum: Windows News
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    Linux Kernel Btrfs Subvolume Race Bug CVE-2024-23850 Fixed

    A recently disclosed robustness bug in the Linux kernel’s Btrfs implementation can trigger an assertion failure and a kernel crash when a newly created subvolume is read before the filesystem has finished the final steps of subvolume creation, producing a local-denial-of-service condition that...
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    CVE-2025-38260: Azure Linux remediation confirmed; other Microsoft artifacts unverified

    Microsoft’s short MSRC line that “Azure Linux includes this open‑source library and is therefore potentially affected” is correct — but it is a product‑scoped attestation, not a universal guarantee that no other Microsoft product can contain the same vulnerable btrfs code. Treat Azure Linux as a...
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    • azure linux btrfs kernel security msrc attestation
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    • Forum: Security Alerts
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    Azure Linux Attestation for CVE-2024-46733: Btrfs Qgroup Leaks and Verification

    Microsoft’s short advisory that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate — but it is a product‑scoped attestation, not a categorical guarantee that no other Microsoft product can carry the same vulnerable Btrfs code. Background / Overview...
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    Btrfs CVE-2025-68358 Fix: Race in Space Info Bitfields Resolved

    A race in btrfs's space bookkeeping has been fixed upstream after discovery of a non-atomic bitfield write in btrfs_clear_space_info_full that can leave the filesystem's reclaim infrastructure in a permanently inconsistent state — tracked as CVE-2025-68358. Background Btrfs is a modern...
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    Azure Linux and CVE-2025-37931: Understanding Microsoft Attestations and Scope

    Microsoft’s short advisory that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate — but it is a product‑scoped attestation, not a proof that no other Microsoft product or artifact could contain the same vulnerable btrfs code. The upstream CVE...
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    • azure linux btrfs csaf vex attestations cve 2025 37931
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    • Forum: Security Alerts
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    CVE-2025-40303: Safe Btrfs Metadata Writeback Fix and Production Patch Guide

    A recently assigned CVE—CVE-2025-40303—targets a corner case in the Linux kernel’s Btrfs implementation that can cause metadata writeback to proceed on a filesystem that has already been marked “in error,” leading to queueing of new work on workqueues that have been stopped and, in certain RAID...
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    • btrfs cve 2025 40303 kernel patch metadata writeback
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    • Forum: Security Alerts
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    CVE-2025-40205 Linux Btrfs file handle out of bounds fix

    A subtle but important memory-safety bug in the Linux kernel’s Btrfs file-handle encoder has been fixed upstream: CVE-2025-40205 closes an out‑of‑bounds write in btrfs_encode_fh that could, in specific circumstances, write eight bytes past the user-supplied buffer. This is primarily an...
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    • btrfs cve 2025 40205 linux kernel memory safety
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    • Forum: Security Alerts
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    CVE-2024-58089: Btrfs Race Triggers Kernel Panic and DoS

    A subtle race in Btrfs ordered-extent accounting can lead to a kernel panic: CVE-2024-58089 fixes a double‑accounting race in btrfs_run_delalloc_range that, when triggered on systems where block size (4K) is smaller than page size (64K) — commonly on certain aarch64 configurations — can...
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    CVE-2024-49932 Fix: Btrfs Readahead DoS in RAID Stripe Tree

    A subtle race between Btrfs readahead and RAID stripe-tree lookups can trigger a kernel BUG that crashes systems performing block-group relocation — CVE-2024-49932 fixes this by skipping readahead of the relocation inode when the filesystem is backed by a RAID stripe tree, but operators must...
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    CVE-2025-40100: Azure Linux Btrfs Bug and Cross‑Product Verification

    Microsoft’s short advisory that “Azure Linux includes this open‑source library and is therefore potentially affected” accurately describes the inventory Microsoft has completed — but it is a product‑scoped attestation, not a categorical statement that no other Microsoft product can include the...
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    • azure linux btrfs linux kernel vex attestations
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    • Forum: Security Alerts
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    CVE-2025-38269 Explained: Azure Linux Attestation and Btrfs Risk

    Microsoft’s brief advisory that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate — but it is a product‑scoped attestation, not a categorical statement that no other Microsoft product can contain the same vulnerable Btrfs code. Background /...
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    • azure linux btrfs vex csaf vulnerability remediation
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    • Forum: Security Alerts
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    CVE-2025-22115 and Azure Linux Attestation: Which Microsoft Artifacts Risk?

    Short answer (TL;DR) No — Azure Linux is the only Microsoft product Microsoft has publicly attested (via its MSRC/VEX/CSAF work) to include the upstream btrfs code for CVE‑2025‑22115 so far, but that statement is a scoped inventory attestation, not a proof that no other Microsoft‑distributed...
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    Azure Linux Attestation and CVE-2024-57976: Not the Only Microsoft Risk

    Microsoft’s public notice that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate — and important — but it does not mean Azure Linux is the only Microsoft product that could contain the vulnerable Btrfs code. The Azure Linux attestation is a...
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    CVE-2024-41067: Azure Linux Btrfs Bug and Microsoft Attestation

    The Linux kernel bug tracked as CVE‑2024‑41067 — a Btrfs scrub path error that can trigger an ASSERT and host instability — has been publicly fixed upstream, and Microsoft’s published advisory names Azure Linux as a Microsoft‑branded product that includes the affected open‑source component and...
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    • azure linux btrfs linux kernel msrc attestation
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    • Forum: Security Alerts