High 7.5Published Dec 27, 2024

CVE-2024-53167nfs/blocklayout: Don't attempt unregister for invalid block device

Updated under an hour ago (2026-10-19 06:20 UTC)

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from d869da91cccb90320e101a2758f1e2b3803ade5c before 3402704a424f34bbcca7f4a4503859357f422217; from d869da91cccb90320e101a2758f1e2b3803ade5c before faa4bacfaeed827a4ca8cb8529a3ce65a9e8ef46; from d869da91cccb90320e101a2758f1e2b3803ade5c before 3a4ce14d9a6b868e0787e4582420b721c04ee41e	CNA record
linux linux_kernel linux:linux_kernel	from 6.11 before 6.11.11; from 6.12 before 6.12.2	NVD

References

https://git.kernel.org/stable/c/3402704a424f34bbcca7f4a4503859357f422217patch
https://git.kernel.org/stable/c/faa4bacfaeed827a4ca8cb8529a3ce65a9e8ef46patch
https://git.kernel.org/stable/c/3a4ce14d9a6b868e0787e4582420b721c04ee41epatch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.