393 lines
19 KiB
JSON
393 lines
19 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-39697",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.115Z",
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"datePublished": "2025-09-05T17:21:03.178Z",
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"dateUpdated": "2026-10-15T01:08:03.870Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:04:38.839Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Fix a race when updating an existing write\n\nAfter nfs_lock_and_join_requests() tests for whether the request is\nstill attached to the mapping, nothing prevents a call to\nnfs_inode_remove_request() from succeeding until we actually lock the\npage group.\nThe reason is that whoever called nfs_inode_remove_request() doesn't\nnecessarily have a lock on the page group head.\n\nSo in order to avoid races, let's take the page group lock earlier in\nnfs_lock_and_join_requests(), and hold it across the removal of the\nrequest in nfs_inode_remove_request()."
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}
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],
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"metrics": [
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is in the NFS client's buffered-write path and is reached through local `write(2)`/mmap dirtying plus writeback-forcing syscalls (`fsync`, `sync_file_range`, `ftruncate`); a purely remote party cannot create the required local writer, though a malicious NFS server can precisely time the racing removal side via its RPC replies.\nAC:L - The attacker controls both sides of the race — one thread issues overlapping buffered writes to the same folio while another forces writeback/invalidation — and can retry the loop indefinitely with no precondition outside their control; server-induced short writes or errors widen the window further.\nPR:L - Only an unprivileged local account with write access to any file on an NFS mount is required, which is the norm on NFS-backed home directories, HPC scratch, and container/Kubernetes NFS volumes.\nUI:N - The attacker's own process performs all the writes, writeback triggers, and truncation; no action by any other user is needed beyond the NFS mount already existing.\nS:U - The corruption and resulting crash are confined to the kernel's own security authority on the affected host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Detaching the folio from NFS's private bookkeeping while requests are still live breaks the writeback-state invariant, allowing mismatched `folio_start/end_writeback` and stale `req->wb_head`/folio references so freed or recycled page contents can be transmitted to the server and read back, and truncated-mapping pointers are dereferenced.\nI:H - Writes acknowledged to userspace are silently discarded — the merged request is detached and freed while the folio's dirty bit is consumed by writeback with no RPC sent — corrupting NFS file data for any process on the client, and kernel request/refcount/`nrequests` state is left inconsistent.\nA:H - The zombie request lets the folio be truncated or reclaimed with `folio->mapping` set to NULL while completion paths unconditionally dereference `folio->mapping->host` (`nfs_page_to_inode`, `nfs_inode_remove_request`, `nfs_folio_end_writeback`), producing a kernel oops, and the `WARN_ON_ONCE` splats panic systems running `panic_on_warn`."
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}
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]
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"fs/nfs/write.c",
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"include/linux/nfs_page.h"
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