{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-53167", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-11-19T17:17:25.005Z", "datePublished": "2024-12-27T13:49:13.201Z", "dateUpdated": "2026-08-05T11:44:15.520Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:44:15.520Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs/blocklayout: Don't attempt unregister for invalid block device\n\nSince commit d869da91cccb (\"nfs/blocklayout: Fix premature PR key\nunregistration\") an unmount of a pNFS SCSI layout-enabled NFS may\ndereference a NULL block_device in:\n\n bl_unregister_scsi+0x16/0xe0 [blocklayoutdriver]\n bl_free_device+0x70/0x80 [blocklayoutdriver]\n bl_free_deviceid_node+0x12/0x30 [blocklayoutdriver]\n nfs4_put_deviceid_node+0x60/0xc0 [nfsv4]\n nfs4_deviceid_purge_client+0x132/0x190 [nfsv4]\n unset_pnfs_layoutdriver+0x59/0x60 [nfsv4]\n nfs4_destroy_server+0x36/0x70 [nfsv4]\n nfs_free_server+0x23/0xe0 [nfs]\n deactivate_locked_super+0x30/0xb0\n cleanup_mnt+0xba/0x150\n task_work_run+0x59/0x90\n syscall_exit_to_user_mode+0x217/0x220\n do_syscall_64+0x8e/0x160\n\nThis happens because even though we were able to create the\nnfs4_deviceid_node, the lookup for the device was unable to attach the\nblock device to the pnfs_block_dev.\n\nIf we never found a block device to register, we can avoid this case with\nthe PNFS_BDEV_REGISTERED flag. Move the deref behind the test for the\nflag." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The malformed device description arrives in a GETDEVICEINFO reply from the remote NFS server, which the client decodes in `bl_alloc_deviceid_node()`; the same server can also remotely trigger the free path via SEQUENCE state-revocation flags leading to `pnfs_destroy_all_layouts()` → `nfs4_deviceid_purge_client()`. No local access to the victim client is needed.\nAC:L - The server fully controls the SCSI designator, and any well-formed NAA/EUI64 designator not matching a local `/dev/disk/by-id/` entry deterministically leaves `bdev_file` NULL; LAYOUT_SCSI is the client's highest-preference layout type and `blocklayoutdriver` autoloads, so no special victim configuration or timing is required.\nPR:N - The attacker acts as the NFS server (or a MITM/compromised trusted server) and holds no credentials or account on the victim client; the client itself initiates the exchange and consumes the reply with no authorization check on the device description.\nUI:N - On an already-established pNFS-capable NFSv4.1 mount — the normal state in enterprise/SAN deployments — a malicious or compromised server can hand out the bad SCSI deviceid and then revoke recallable state to force the purge with no action by any user.\nS:U - The NULL dereference occurs in kernel context within the NFS client and its impact is confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The dereference is at a fixed low offset from NULL (`f_mapping` at ~0x18 in `struct file`), which is unmapped under `mmap_min_addr`; no memory contents are read out or disclosed to the attacker.\nI:N - The bug provides only a read of an unmapped low address, yielding no write primitive or control over kernel data; no memory is modified before the fault.\nA:H - The oops kills the faulting task — either `umount` (leaving the NFS superblock permanently wedged) or the NFS state-manager kernel thread (hanging all NFS I/O for that client) — and on the many deployments running `panic_on_oops` it is a full system panic, repeatable at the attacker's will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfs/blocklayout/dev.c" ], "versions": [ { "version": "d869da91cccb90320e101a2758f1e2b3803ade5c", "lessThan": "3402704a424f34bbcca7f4a4503859357f422217", "status": "affected", "versionType": "git" }, { "version": "d869da91cccb90320e101a2758f1e2b3803ade5c", "lessThan": "faa4bacfaeed827a4ca8cb8529a3ce65a9e8ef46", "status": "affected", "versionType": "git" }, { "version": "d869da91cccb90320e101a2758f1e2b3803ade5c", "lessThan": "3a4ce14d9a6b868e0787e4582420b721c04ee41e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfs/blocklayout/dev.c" ], "versions": [ { "version": "6.11", "status": "affected" }, { "version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.11", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.2", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.11.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3402704a424f34bbcca7f4a4503859357f422217" }, { "url": "https://git.kernel.org/stable/c/faa4bacfaeed827a4ca8cb8529a3ce65a9e8ef46" }, { "url": "https://git.kernel.org/stable/c/3a4ce14d9a6b868e0787e4582420b721c04ee41e" } ], "title": "nfs/blocklayout: Don't attempt unregister for invalid block device", "x_generator": { "engine": "bippy-1.2.0" } } } }