{
  "cveId": "CVE-2026-43299",
  "url": "https://patchblox.com/security/cve/CVE-2026-43299",
  "summary": "CVE-2026-43299 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-43299, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "btrfs: do not ASSERT() when the fs flips RO inside btrfs_repair_io_failure()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  btrfs: do not ASSERT() when the fs flips RO inside btrfs_repair_io_failure()  [BUG] There is a bug report that when btrfs hits ENOSPC error in a critical path, btrfs flips RO (this part is expected, although the ENOSPC bug still needs to be addressed).  The problem is after the RO flip, if there is a read repair pending, we can hit the ASSERT() inside btrfs_repair_io_failure() like the following:    BTRFS info (device vdc): relocating block group 30408704 flags metadata|raid1   ------------[ cut here ]------------   BTRFS: Transaction aborted (error -28)   WARNING: fs/btrfs/extent-tree.c:3235 at __btrfs_free_extent.isra.0\u002B0x453/0xfd0, CPU#1: btrfs/383844   Modules linked in: kvm_intel kvm irqbypass   [...]   ---[ end trace 0000000000000000 ]---   BTRFS info (device vdc state EA): 2 enospc errors during balance   BTRFS info (device vdc state EA): balance: ended with status: -30   BTRFS error (device vdc state EA): parent transid verify failed on logical 30556160 mirror 2 wanted 8 found 6   BTRFS error (device vdc state EA): bdev /dev/nvme0n1 errs: wr 0, rd 0, flush 0, corrupt 10, gen 0   [...]   assertion failed: !(fs_info-\u003Esb-\u003Es_flags \u0026 SB_RDONLY) :: 0, in fs/btrfs/bio.c:938   ------------[ cut here ]------------   assertion failed: !(fs_info-\u003Esb-\u003Es_flags \u0026 SB_RDONLY) :: 0, in fs/btrfs/bio.c:938   kernel BUG at fs/btrfs/bio.c:938!   Oops: invalid opcode: 0000 [#1] SMP NOPTI   CPU: 0 UID: 0 PID: 868 Comm: kworker/u8:13 Tainted: G        W        N  6.19.0-rc6\u002B #4788 PREEMPT(full)   Tainted: [W]=WARN, [N]=TEST   Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014   Workqueue: btrfs-endio simple_end_io_work   RIP: 0010:btrfs_repair_io_failure.cold\u002B0xb2/0x120   RSP: 0000:ffffc90001d2bcf0 EFLAGS: 00010246   RAX: 0000000000000051 RBX: 0000000000001000 RCX: 0000000000000000   RDX: 0000000000000000 RSI: ffffffff8305cf42 RDI: 00000000ffffffff   RBP: 0000000000000002 R08: 00000000fffeffff R09: ffffffff837fa988   R10: ffffffff8327a9e0 R11: 6f69747265737361 R12: ffff88813018d310   R13: ffff888168b8a000 R14: ffffc90001d2bd90 R15: ffff88810a169000   FS:  0000000000000000(0000) GS:ffff8885e752c000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   ------------[ cut here ]------------  [CAUSE] The cause of -ENOSPC error during the test case btrfs/124 is still unknown, although it\u0027s known that we still have cases where metadata can be over-committed but can not be fulfilled correctly, thus if we hit such ENOSPC error inside a critical path, we have no choice but abort the current transaction.  This will mark the fs read-only.  The problem is inside the btrfs_repair_io_failure() path that we require the fs not to be mount read-only. This is normally fine, but if we are doing a read-repair meanwhile the fs flips RO due to a critical error, we can enter btrfs_repair_io_failure() with super block set to read-only, thus triggering the above crash.  [FIX] Just replace the ASSERT() with a proper return if the fs is already read-only.",
  "published": "2026-05-08T14:16:37Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00131,
  "epssPercentile": 0.02714,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43299",
  "fixes": [
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      "platform": "linux",
      "product": "dtb-aarch64",
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      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
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      "product": "kernel-64kb",
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      "fix": "OPENSUSE-SU-2026:21910-1",
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}