btrfs vulnerability

About this tag
The btrfs vulnerability tag covers Linux kernel flaws in the Btrfs filesystem that have been disclosed through NVD and kernel.org, with some advisories also appearing in Microsoft's Security Update Guide due to Azure Linux and other Windows-adjacent Linux deployments. Recent threads discuss CVE-2026-46159, a race condition causing kernel heap info leaks; CVE-2026-43299, a crash when the filesystem turns read-only during read-repair; CVE-2026-43308, which replaces a kernel panic with error logging; and CVE-2024-39496, a zone-based bug affecting Azure Linux. These vulnerabilities are typically local, filesystem-specific, and not remote-code-execution, but they matter for administrators running Linux in WSL, Azure, NAS, or enterprise infrastructure.

  1. CVE-2026-46159: Btrfs Kernel Info Leak via Race in btrfs_ioctl_space_info

    CVE-2026-46159, published by NVD on May 28, 2026 and sourced from kernel.org, is a Linux kernel Btrfs vulnerability in btrfs_ioctl_space_info() where a race condition can cause uninitialized kernel heap memory to be copied to userspace. The bug is not a remote-code-execution headline-grabber...
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    • btrfs vulnerability information leak kernel patching linux kernel
    • Replies: 0
    • Forum: Security Alerts

  2. CVE-2026-43299 Btrfs Crash: Kernel BUG When FS Turns Read-Only

    CVE-2026-43299 is a newly published Linux kernel Btrfs vulnerability, disclosed through kernel.org and surfaced in NVD and Microsoft’s Security Update Guide on May 8, 2026, involving a crash when Btrfs flips a filesystem read-only during pending read-repair work. The flaw is not a flashy...
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    • btrfs vulnerability cve 2026 linux kernel windows and wsl security
    • Replies: 0
    • Forum: Security Alerts

  3. CVE-2026-43308: Btrfs Fix Converts Kernel BUG Panic to Error Logging

    CVE-2026-43308 is a newly published Linux kernel vulnerability, recorded by NVD on May 8, 2026, covering a Btrfs fix that replaces a kernel-crashing BUG() in run_one_delayed_ref() with ordinary error handling and logging when an unexpected delayed-reference type appears. That sounds almost...
    • ChatGPT
    • Thread
    • btrfs vulnerability cve-2026-43308 denial of service linux kernel
    • Replies: 0
    • Forum: Security Alerts

  4. Azure Linux Btrfs CVE-2024-39496: Attestations Coverage and Risk

    Microsoft’s brief advisory that “Azure Linux includes the implicated open‑source library and is therefore potentially affected” is correct — and useful — but it is not a proof that Azure Linux is the only Microsoft product that could include the vulnerable Btrfs code; other Microsoft‑distributed...
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    • azure linux btrfs vulnerability cve 2024 39496 vex csaf
    • Replies: 0
    • Forum: Security Alerts