Riskcovery

CVE-2024-53167

nfs/blocklayout: Don't attempt unregister for invalid block device

State
Published
Severity
7.5 High
Published
Dec 27, 2024
Updated
Oct 15, 2026
Reserved
Nov 19, 2024

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

nfs/blocklayout: Don't attempt unregister for invalid block device

Since commit d869da91cccb ("nfs/blocklayout: Fix premature PR key unregistration") an unmount of a pNFS SCSI layout-enabled NFS may dereference a NULL block_device in:

bl_unregister_scsi+0x16/0xe0 [blocklayoutdriver] bl_free_device+0x70/0x80 [blocklayoutdriver] bl_free_deviceid_node+0x12/0x30 [blocklayoutdriver] nfs4_put_deviceid_node+0x60/0xc0 [nfsv4] nfs4_deviceid_purge_client+0x132/0x190 [nfsv4] unset_pnfs_layoutdriver+0x59/0x60 [nfsv4] nfs4_destroy_server+0x36/0x70 [nfsv4] nfs_free_server+0x23/0xe0 [nfs] deactivate_locked_super+0x30/0xb0 cleanup_mnt+0xba/0x150 task_work_run+0x59/0x90 syscall_exit_to_user_mode+0x217/0x220 do_syscall_64+0x8e/0x160

This happens because even though we were able to create the nfs4_deviceid_node, the lookup for the device was unable to attach the block device to the pnfs_block_dev.

If we never found a block device to register, we can avoid this case with the PNFS_BDEV_REGISTERED flag. Move the deref behind the test for the flag.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • d869da91cccb90320e101a2758f1e2b3803ade5c to before 3402704a424f34bbcca7f4a4503859357f422217Affected
  • d869da91cccb90320e101a2758f1e2b3803ade5c to before faa4bacfaeed827a4ca8cb8529a3ce65a9e8ef46Affected
  • d869da91cccb90320e101a2758f1e2b3803ade5c to before 3a4ce14d9a6b868e0787e4582420b721c04ee41eAffected
LinuxLinux
  • 6.11Affected
  • before 6.11Not affected
  • 6.11.11 through 6.11.*Not affected
  • 6.12.2 through 6.12.*Not affected
  • 6.13 and laterNot affected

References

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