{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38232","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:23.996Z","datePublished":"2025-07-04T13:37:45.635Z","dateUpdated":"2026-08-05T12:00:32.250Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:00:32.250Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: fix race between nfsd registration and exports_proc\n\nAs of now nfsd calls create_proc_exports_entry() at start of init_nfsd\nand cleanup by remove_proc_entry() at last of exit_nfsd.\n\nWhich causes kernel OOPs if there is race between below 2 operations:\n(i) exportfs -r\n(ii) mount -t nfsd none /proc/fs/nfsd\n\nfor 5.4 kernel ARM64:\n\nCPU 1:\nel1_irq+0xbc/0x180\narch_counter_get_cntvct+0x14/0x18\nrunning_clock+0xc/0x18\npreempt_count_add+0x88/0x110\nprep_new_page+0xb0/0x220\nget_page_from_freelist+0x2d8/0x1778\n__alloc_pages_nodemask+0x15c/0xef0\n__vmalloc_node_range+0x28c/0x478\n__vmalloc_node_flags_caller+0x8c/0xb0\nkvmalloc_node+0x88/0xe0\nnfsd_init_net+0x6c/0x108 [nfsd]\nops_init+0x44/0x170\nregister_pernet_operations+0x114/0x270\nregister_pernet_subsys+0x34/0x50\ninit_nfsd+0xa8/0x718 [nfsd]\ndo_one_initcall+0x54/0x2e0\n\nCPU 2 :\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n\nPC is at : exports_net_open+0x50/0x68 [nfsd]\n\nCall trace:\nexports_net_open+0x50/0x68 [nfsd]\nexports_proc_open+0x2c/0x38 [nfsd]\nproc_reg_open+0xb8/0x198\ndo_dentry_open+0x1c4/0x418\nvfs_open+0x38/0x48\npath_openat+0x28c/0xf18\ndo_filp_open+0x70/0xe8\ndo_sys_open+0x154/0x248\n\nSometimes it crashes at exports_net_open() and sometimes cache_seq_next_rcu().\n\nand same is happening on latest 6.14 kernel as well:\n\n[    0.000000] Linux version 6.14.0-rc5-next-20250304-dirty\n...\n[  285.455918] Unable to handle kernel paging request at virtual address 00001f4800001f48\n...\n[  285.464902] pc : cache_seq_next_rcu+0x78/0xa4\n...\n[  285.469695] Call trace:\n[  285.470083]  cache_seq_next_rcu+0x78/0xa4 (P)\n[  285.470488]  seq_read+0xe0/0x11c\n[  285.470675]  proc_reg_read+0x9c/0xf0\n[  285.470874]  vfs_read+0xc4/0x2fc\n[  285.471057]  ksys_read+0x6c/0xf4\n[  285.471231]  __arm64_sys_read+0x1c/0x28\n[  285.471428]  invoke_syscall+0x44/0x100\n[  285.471633]  el0_svc_common.constprop.0+0x40/0xe0\n[  285.471870]  do_el0_svc_compat+0x1c/0x34\n[  285.472073]  el0_svc_compat+0x2c/0x80\n[  285.472265]  el0t_32_sync_handler+0x90/0x140\n[  285.472473]  el0t_32_sync+0x19c/0x1a0\n[  285.472887] Code: f9400885 93407c23 937d7c27 11000421 (f86378a3)\n[  285.473422] ---[ end trace 0000000000000000 ]---\n\nIt reproduced simply with below script:\nwhile [ 1 ]\ndo\n/exportfs -r\ndone &\n\nwhile [ 1 ]\ndo\ninsmod /nfsd.ko\nmount -t nfsd none /proc/fs/nfsd\numount /proc/fs/nfsd\nrmmod nfsd\ndone &\n\nSo exporting interfaces to user space shall be done at last and\ncleanup at first place.\n\nWith change there is no Kernel OOPs."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The race is reached through local syscalls only — `open()`/`read()` on the world-readable `/proc/fs/nfs/exports` racing against nfsd module init/exit; no NFS protocol traffic can trigger `init_nfsd()`/`exit_nfsd()` or the proc-entry path.\nAC:L - The attacker controls both sides of the race: spinning open/read loops on multiple CPUs while triggering nfsd module autoload via `unshare -Urm` + `mount -t nfsd`, and the commit's own reproducer shows the oops occurs reliably (\"Sometimes it crashes at exports_net_open() and sometimes cache_seq_next_rcu()\").\nPR:L - `proc_create(\"exports\", 0, ...)` defaults to 0444, so any unprivileged local user can open and read the file, and module autoload is reachable from an unprivileged user namespace because `request_module(\"fs-nfsd\")` runs before the `FS_USERNS_MOUNT` capability check in fs/super.c.\nUI:N - The attacker performs all steps itself — the reader loop and the module-load trigger — with no action required from any other user or administrator.\nS:U - The corruption and its consequences are confined to the kernel's own memory and the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - On the unload path the reader holds a freed `cache_detail`, and `__cache_seq_start`/`cache_seq_next` walk freed hash tables whose contents `e_show()`/`svc_export_show()` format into the seq buffer returned to userspace, leaking arbitrary reallocated kernel heap data; the init path additionally dereferences an uninitialized `net_generic` slot as a pointer.\nI:H - This is a use-after-free on `nn->svc_export_cache` and the `nfsd_net` itself — the attacker can spray the freed slab and have the kernel treat attacker-controlled bytes as `cache_detail`/`cache_head` fields and list pointers, giving a path to controlled writes and control-flow corruption.\nA:H - The commit documents reproducible kernel oopses on both arm64 5.4 (NULL deref at 0x10 in `exports_net_open`) and 6.14 (paging fault in `cache_seq_next_rcu`), and an unprivileged user can retrigger the crash at will."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfsctl.c"],"versions":[{"version":"bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7","lessThan":"49b57b98fa601ae6cc7897bab4515129da8290f7","status":"affected","versionType":"git"},{"version":"bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7","lessThan":"88d6785c173a7c4de05bef8c4fd8a9b42ead02d5","status":"affected","versionType":"git"},{"version":"bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7","lessThan":"8120e420013d947c890f358f30a2d98ba8ac20bc","status":"affected","versionType":"git"},{"version":"bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7","lessThan":"2029ca75cdfa6a25716a5a76b751486cce7e3822","status":"affected","versionType":"git"},{"version":"bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7","lessThan":"327011a2bb4f7de9c72b891a96ce8d902828bddf","status":"affected","versionType":"git"},{"version":"bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7","lessThan":"f7fb730cac9aafda8b9813b55d04e28a9664d17c","status":"affected","versionType":"git"},{"version":"8677e99150b0830d29cc1318b4cc559e176940bb","status":"affected","versionType":"git"},{"version":"7c7cb07d4affcf41749234fe9dc4d90cd3959e32","status":"affected","versionType":"git"},{"version":"4d41f65efeec0a6da6088341203c81e49ebfcd90","status":"affected","versionType":"git"},{"version":"5.4.102","lessThan":"5.5","status":"affected","versionType":"semver"},{"version":"5.10.20","lessThan":"5.11","status":"affected","versionType":"semver"},{"version":"5.11.3","lessThan":"5.12","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfsctl.c"],"versions":[{"version":"5.12","status":"affected"},{"version":"0","lessThan":"5.12","status":"unaffected","versionType":"semver"},{"version":"5.15.199","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.162","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.122","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.35","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.15.4","lessThanOrEqual":"6.15.*","status":"unaffected","versionType":"semver"},{"version":"6.16","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":"5.12","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.12.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.15.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.102"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/49b57b98fa601ae6cc7897bab4515129da8290f7"},{"url":"https://git.kernel.org/stable/c/88d6785c173a7c4de05bef8c4fd8a9b42ead02d5"},{"url":"https://git.kernel.org/stable/c/8120e420013d947c890f358f30a2d98ba8ac20bc"},{"url":"https://git.kernel.org/stable/c/2029ca75cdfa6a25716a5a76b751486cce7e3822"},{"url":"https://git.kernel.org/stable/c/327011a2bb4f7de9c72b891a96ce8d902828bddf"},{"url":"https://git.kernel.org/stable/c/f7fb730cac9aafda8b9813b55d04e28a9664d17c"}],"title":"NFSD: 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