{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38028","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T04:51:23.978Z","datePublished":"2025-06-18T09:28:33.184Z","dateUpdated":"2026-08-05T11:59:03.121Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:59:03.121Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFS/localio: Fix a race in nfs_local_open_fh()\n\nOnce the clp->cl_uuid.lock has been dropped, another CPU could come in\nand free the struct nfsd_file that was just added. To prevent that from\nhappening, take the RCU read lock before dropping the spin lock."}],"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 vulnerable code is the NFS client LOCALIO fast path, reached by ordinary read/write/commit syscalls against a mounted NFS filesystem (nfs_generic_pg_pgios and nfs_initiate_commit both call nfs_local_open_fh). LOCALIO by definition requires the nfsd server to be on the same host, so there is no remote packet path to this code.\nAC:L - The attacker controls both sides of the race: one set of threads issues concurrent I/O to enter nfs_local_open_fh, while another forces nfs_localio_disable_client()/nfs_uuid_put() to free the cached nfsd_file (via -ENOMEM/-ENXIO/-ENOENT from __nfs_local_open_fh or -EAGAIN from nfs_local_doio). The window is repeatedly retriable at will and widened by preemption under CPU pressure.\nPR:L - Any unprivileged local user with access to files on a LOCALIO-enabled NFS mount can drive both sides purely with read/write/close syscalls; no capability check exists anywhere along nfs_generic_pg_pgios → nfs_local_open_fh. The mount itself is a deployment precondition rather than a privilege the attacker must hold.\nUI:N - The attacker triggers the race entirely from their own concurrent threads; no victim action is needed once the localio mount exists.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - If the freed nfsd_file slot is reallocated, nfs_local_open_fh returns a pointer to a different live nfsd_file whose nf_file is then used for the NFS read, disclosing the contents of an unrelated file on the exported filesystem; more generally a UAF on the slab yields an arbitrary-read primitive.\nI:H - refcount_inc_not_zero() writes into freed/reallocated memory, and the returned stale nfsd_file is used for write_iter, corrupting a different file's data as well as another object's refcount, which enables a follow-on premature free and control-flow hijack.\nA:H - Use-after-free on the nfsd_file slab causes refcount warnings, slab corruption and oops/panic, and the corrupted refcount leads to a second premature free of a live nfsd_file — a repeatable local denial of service."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfs/localio.c"],"versions":[{"version":"86e00412254a717ffd5d38dc5ec0ee1cce6281b3","lessThan":"185a2f2ddabdcf999823f61de67f86376883920d","status":"affected","versionType":"git"},{"version":"86e00412254a717ffd5d38dc5ec0ee1cce6281b3","lessThan":"fa7ab64f1e2fdc8f2603aab8e0dd20de89cb10d9","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/localio.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","status":"unaffected","versionType":"semver"},{"version":"6.14.8","lessThanOrEqual":"6.14.*","status":"unaffected","versionType":"semver"},{"version":"6.15","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":"6.14","versionEndExcluding":"6.14.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.15"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/185a2f2ddabdcf999823f61de67f86376883920d"},{"url":"https://git.kernel.org/stable/c/fa7ab64f1e2fdc8f2603aab8e0dd20de89cb10d9"}],"title":"NFS/localio: Fix a race in nfs_local_open_fh()","x_generator":{"engine":"bippy-1.2.0"}}}}