{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64593",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64593"
  ],
  "published": "2026-08-06T07:14:03Z",
  "summary": "btrfs: do not trim a device which is not writeable",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not trim a device which is not writeable\n\n[BUG]\nThere is a bug report that btrfs/242 can randomly fail with the\nfollowing NULL pointer dereference:\n\n  run fstests btrfs/242 at 2026-06-01 10:25:08\n  BTRFS: device fsid d4d7f234-487c-4787-88e4-47a8b68c9874 devid 1 transid 9 /dev/sdc (8:32) scanned by mount (122609)\n  BTRFS info (device sdc): first mount of filesystem d4d7f234-487c-4787-88e4-47a8b68c9874\n  BTRFS info (device sdc): using crc32c checksum algorithm\n  BTRFS warning (device sdc): devid 2 uuid fbe72d72-3272-482d-80fb-ab88ed398192 is missing\n  BTRFS warning (device sdc): devid 2 uuid fbe72d72-3272-482d-80fb-ab88ed398192 is missing\n  BTRFS info (device sdc): allowing degraded mounts\n  BTRFS info (device sdc): turning on async discard\n  BTRFS info (device sdc): enabling free space tree\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000018\n  user pgtable: 4k pages, 48-bit VAs, pgdp=000000013fd6b000\n  CPU: 4 UID: 0 PID: 122625 Comm: fstrim Not tainted 7.0.10-2-default #1 PREEMPT(full) openSUSE Tumbleweed e9a5f6b24978fba3bf015a992f865837fdfff3dd\n  Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250812-19.fc42 08/12/2025\n  pstate: 01400005 (nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n  pc : btrfs_trim_fs+0x34c/0xa00 [btrfs]\n  lr : btrfs_trim_fs+0x1f0/0xa00 [btrfs]\n  Call trace:\n   btrfs_trim_fs+0x34c/0xa00 [btrfs f02c1d570ceea621c69d302ba75dd61868083840] (P)\n   btrfs_ioctl_fitrim+0xe8/0x178 [btrfs f02c1d570ceea621c69d302ba75dd61868083840]\n   btrfs_ioctl+0xdd4/0x2bd8 [btrfs f02c1d570ceea621c69d302ba75dd61868083840]\n   __arm64_sys_ioctl+0xac/0x108\n   invoke_syscall.constprop.0+0x5c/0xd0\n   el0_svc_common.constprop.0+0x40/0xf0\n   do_el0_svc+0x24/0x40\n   el0_svc+0x40/0x1d0\n   el0t_64_sync_handler+0xa0/0xe8\n   el0t_64_sync+0x1b0/0x1b8\n  Code: 17ffff83 f94017e0 f9002be0 f9402ea0 (f9400c00)\n  ---[ end trace 0000000000000000  ]---\n\nAlso the reporter is very kind to test the following ASSERT() added to\nbtrfs_trim_free_extents_throttle():\n\n\tASSERT(device->bdev,\n\t       \"devid=%llu path=%s dev_state=0x%lx\\n\",\n\t       device->devid, btrfs_dev_name(device), device->dev_state);\n\nAnd it shows the following output:\n\n  assertion failed: device->bdev, in extent-tree.c:6630 (devid=2 path=/dev/sdd dev_state=0x82)\n\nWhich means the device->bdev is NULL, and the dev_state is\nBTRFS_DEV_STATE_IN_FS_METADATA | BTRFS_DEV_STATE_ITEM_FOUND, without\nBTRFS_DEV_STATE_WRITEABLE flag set.\n\n[CAUSE]\nThe pc points to the following call chain:\n\n  btrfs_trim_fs()\n  |- btrfs_trim_free_extents()\n     |- btrfs_trim_free_extents_throttle()\n        |- bdev_max_discard_sectors(device->bdev)\n\nSo the NULL pointer dereference is caused by device->bdev being NULL.\n\nThis looks impossible by a quick glance, as just before calling\nbtrfs_trim_free_extents_throttle(), we have skipped any device that has\nBTRFS_DEV_STATE_MISSING flag set.\n\nHowever in this particular case, there is a window where the missing\ndevice is later re-scanned, causing btrfs to remove the\nBTRFS_DEV_STATE_MISSING flag:\n\n  btrfs_control_ioctl()\n  |- btrfs_scan_one_device()\n     |- device_list_add()\n        |- rcu_assign_pointer(device->name, name);\n        |  This updates the missing device's path to the new good path.\n        |\n        |- clear_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)\n           This removes the BTRFS_DEV_STATE_MISSING flag.\n\nThis allows the missing device to re-appear and clear the\nBTRFS_DEV_STATE_MISSING flag.  However the device still does not have\nthe BTRFS_DEV_STATE_WRITEABLE flag set, nor is its bdev pointer updated.\n\nThe bdev pointer remains NULL, triggering the crash later.\n\n[FIX]\nThis is a big de-synchronization between BTRFS_DEV_STATE_MISSING and\ndevice->bdev pointer, and shows a gap in btrfs's re-appearing-device\nhandling.\n\nThe proper handling of re-appearing device will need quite some extra\nwork, which is out of the context of this small\n---truncated---",
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
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}