{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50046", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.071Z", "datePublished": "2024-10-21T19:39:43.780Z", "dateUpdated": "2026-08-05T11:41:15.082Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:15.082Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies()\n\nOn the node of an NFS client, some files saved in the mountpoint of the\nNFS server were copied to another location of the same NFS server.\nAccidentally, the nfs42_complete_copies() got a NULL-pointer dereference\ncrash with the following syslog:\n\n[232064.838881] NFSv4: state recovery failed for open file nfs/pvc-12b5200d-cd0f-46a3-b9f0-af8f4fe0ef64.qcow2, error = -116\n[232064.839360] NFSv4: state recovery failed for open file nfs/pvc-12b5200d-cd0f-46a3-b9f0-af8f4fe0ef64.qcow2, error = -116\n[232066.588183] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000058\n[232066.588586] Mem abort info:\n[232066.588701] ESR = 0x0000000096000007\n[232066.588862] EC = 0x25: DABT (current EL), IL = 32 bits\n[232066.589084] SET = 0, FnV = 0\n[232066.589216] EA = 0, S1PTW = 0\n[232066.589340] FSC = 0x07: level 3 translation fault\n[232066.589559] Data abort info:\n[232066.589683] ISV = 0, ISS = 0x00000007\n[232066.589842] CM = 0, WnR = 0\n[232066.589967] user pgtable: 64k pages, 48-bit VAs, pgdp=00002000956ff400\n[232066.590231] [0000000000000058] pgd=08001100ae100003, p4d=08001100ae100003, pud=08001100ae100003, pmd=08001100b3c00003, pte=0000000000000000\n[232066.590757] Internal error: Oops: 96000007 [#1] SMP\n[232066.590958] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm vhost_net vhost vhost_iotlb tap tun ipt_rpfilter xt_multiport ip_set_hash_ip ip_set_hash_net xfrm_interface xfrm6_tunnel tunnel4 tunnel6 esp4 ah4 wireguard libcurve25519_generic veth xt_addrtype xt_set nf_conntrack_netlink ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_bitmap_port ip_set_hash_ipport dummy ip_set ip_vs_sh ip_vs_wrr ip_vs_rr ip_vs iptable_filter sch_ingress nfnetlink_cttimeout vport_gre ip_gre ip_tunnel gre vport_geneve geneve vport_vxlan vxlan ip6_udp_tunnel udp_tunnel openvswitch nf_conncount dm_round_robin dm_service_time dm_multipath xt_nat xt_MASQUERADE nft_chain_nat nf_nat xt_mark xt_conntrack xt_comment nft_compat nft_counter nf_tables nfnetlink ocfs2 ocfs2_nodemanager ocfs2_stackglue iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ipmi_ssif nbd overlay 8021q garp mrp bonding tls rfkill sunrpc ext4 mbcache jbd2\n[232066.591052] vfat fat cas_cache cas_disk ses enclosure scsi_transport_sas sg acpi_ipmi ipmi_si ipmi_devintf ipmi_msghandler ip_tables vfio_pci vfio_pci_core vfio_virqfd vfio_iommu_type1 vfio dm_mirror dm_region_hash dm_log dm_mod nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 br_netfilter bridge stp llc fuse xfs libcrc32c ast drm_vram_helper qla2xxx drm_kms_helper syscopyarea crct10dif_ce sysfillrect ghash_ce sysimgblt sha2_ce fb_sys_fops cec sha256_arm64 sha1_ce drm_ttm_helper ttm nvme_fc igb sbsa_gwdt nvme_fabrics drm nvme_core i2c_algo_bit i40e scsi_transport_fc megaraid_sas aes_neon_bs\n[232066.596953] CPU: 6 PID: 4124696 Comm: 10.253.166.125- Kdump: loaded Not tainted 5.15.131-9.cl9_ocfs2.aarch64 #1\n[232066.597356] Hardware name: Great Wall .\\x93\\x8e...RF6260 V5/GWMSSE2GL1T, BIOS T656FBE_V3.0.18 2024-01-06\n[232066.597721] pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[232066.598034] pc : nfs4_reclaim_open_state+0x220/0x800 [nfsv4]\n[232066.598327] lr : nfs4_reclaim_open_state+0x12c/0x800 [nfsv4]\n[232066.598595] sp : ffff8000f568fc70\n[232066.598731] x29: ffff8000f568fc70 x28: 0000000000001000 x27: ffff21003db33000\n[232066.599030] x26: ffff800005521ae0 x25: ffff0100f98fa3f0 x24: 0000000000000001\n[232066.599319] x23: ffff800009920008 x22: ffff21003db33040 x21: ffff21003db33050\n[232066.599628] x20: ffff410172fe9e40 x19: ffff410172fe9e00 x18: 0000000000000000\n[232066.599914] x17: 0000000000000000 x16: 0000000000000004 x15: 0000000000000000\n[232066.600195] x14: 0000000000000000 x13: ffff800008e685a8 x12: 00000000eac0c6e6\n[232066.600498] x11: 00000000000000\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The type-confused dereference executes in the NFS client's state-manager and CB_OFFLOAD callback paths, both driven entirely by remote NFS server RPCs — the server chooses when to force state recovery (STALE_CLIENTID/BAD_SESSION/EXPIRED or a reboot) and supplies the `wr_count`/write-verifier bytes that land in the misinterpreted fields. A malicious, compromised, or on-path (auth_sys, no krb5i/p) NFS server reaches this purely over the network.\nAC:L - The attacker controls both preconditions — withholding CB_OFFLOAD keeps async inter-mount copies pending indefinitely, and returning a stale-clientid/expired error forces reclaim on demand — with no unwinnable race and no memory layout the attacker cannot influence. The condition is common enough that the reporter hit it accidentally during ordinary `cp` workload.\nPR:N - The remote NFS server (or MITM) holds no credentials or privileges on the victim client, and the copy_file_range that arms the list is routine unprivileged workload rather than a privileged operation. No local account on the client is needed.\nUI:N - copy_file_range across NFS mounts is ordinary background activity on any NFS client (coreutils `cp` issues it automatically), and an unprivileged local user can issue it themselves; no distinct victim action is required at exploit time.\nS:U - The corruption and the crash are confined to kernel memory within the same security authority — no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `copy->parent_dst_state` is read at `real+144`, past the end of the 136-byte object into non-zeroed slab slack, and then dereferenced as a `struct nfs4_state *`; with standard kmalloc-192 grooming this becomes an attacker-chosen arbitrary-address read, and the shifted accesses also expose live object fields.\nI:H - This is a container_of type confusion with write effects: `copy->flags = 1` overwrites a live object's `parent_dst_state` pointer, and `complete()` on the skewed completion performs `list_del_init()` on `count`/`verf.verifier` — 64-bit values written directly from the server's CB_OFFLOAD reply — giving a classic remote-fed unlink write primitive.\nA:H - A confirmed kernel oops in the `nfs4_state_manager` kthread is in the commit's own crash log, and the misaligned `raw_spin_lock_irqsave` on a never-zero word spins forever with IRQs disabled while holding `clp->cl_lock`, hanging the client." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfs/client.c", "fs/nfs/nfs42proc.c", "fs/nfs/nfs4state.c", "include/linux/nfs_fs_sb.h" ], "versions": [ { "version": "0e65a32c8a569db363048e17a708b1a0913adbef", "lessThan": "f892165c564e3aab272948dbb556cc20e290c55a", "status": "affected", "versionType": "git" }, { "version": "0e65a32c8a569db363048e17a708b1a0913adbef", "lessThan": "584c019baedddec3fd634053e8fb2d8836108d38", "status": "affected", "versionType": "git" }, { "version": "0e65a32c8a569db363048e17a708b1a0913adbef", "lessThan": "632344b9efa064ca737bfcdaaaced59fd5f18ae9", "status": "affected", "versionType": "git" }, { "version": "0e65a32c8a569db363048e17a708b1a0913adbef", "lessThan": "fca41e5fa4914d12b2136c25f9dad69520b52683", "status": "affected", "versionType": "git" }, { "version": "0e65a32c8a569db363048e17a708b1a0913adbef", "lessThan": "ef9189bb15dcbe7ed3f3515aaa6fc8bf7483960d", "status": "affected", "versionType": "git" }, { "version": "0e65a32c8a569db363048e17a708b1a0913adbef", "lessThan": "a848c29e3486189aaabd5663bc11aea50c5bd144", "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/client.c", "fs/nfs/nfs42proc.c", "fs/nfs/nfs4state.c", "include/linux/nfs_fs_sb.h" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.227", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.57", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.4", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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": "5.5", "versionEndExcluding": "5.10.227" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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