- Vulnerability/
- CVE-2024-53167
CVE-2024-53167: nfs/blocklayout: Don't attempt unregister for invalid block device
First published: Fri Dec 27 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/3402704a424f34bbcca7f4a4503859357f422217
- https://git.kernel.org/stable/c/3a4ce14d9a6b868e0787e4582420b721c04ee41e
- https://git.kernel.org/stable/c/faa4bacfaeed827a4ca8cb8529a3ce65a9e8ef46
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-53167
- https://nvd.nist.gov/vuln/detail/CVE-2024-53167
- https://launchpad.net/bugs/cve/CVE-2024-53167
- https://security-tracker.debian.org/tracker/CVE-2024-53167
- https://ubuntu.com/security/CVE-2024-53167
- https://git.kernel.org/linus/3a4ce14d9a6b868e0787e4582420b721c04ee41e
Frequently Asked Questions
What is the severity of CVE-2024-53167?
CVE-2024-53167 has been classified as a medium severity vulnerability.
What impact does CVE-2024-53167 have on affected systems?
CVE-2024-53167 may cause dereferencing issues during the unmount of a pNFS SCSI layout-enabled NFS.
How do I fix CVE-2024-53167?
To mitigate CVE-2024-53167, update the Linux kernel to the latest stable version that includes the fix.
Which versions of the Linux kernel are affected by CVE-2024-53167?
CVE-2024-53167 affects versions of the Linux kernel prior to the fix being applied in the stable update.
Is CVE-2024-53167 part of any known exploitation attempts?
As of now, there are no known active exploitation attempts specific to CVE-2024-53167.
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