394 lines
19 KiB
JSON
394 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-2025-38430",
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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": "2025-04-16T04:51:24.015Z",
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"datePublished": "2025-07-25T14:16:49.443Z",
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"dateUpdated": "2026-10-15T21:52:15.936Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:01:50.343Z"
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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\nnfsd: nfsd4_spo_must_allow() must check this is a v4 compound request\n\nIf the request being processed is not a v4 compound request, then\nexamining the cstate can have undefined results.\n\nThis patch adds a check that the rpc procedure being executed\n(rq_procinfo) is the NFSPROC4_COMPOUND procedure."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - The vulnerable code is in the in-kernel NFS server and is reached purely by processing NFSv2/NFSv3/NFSACL or NLM RPCs arriving on TCP/2049 (or the lockd port) from a remote peer. No local access is required.\nAC:L - On any export with an explicit sec= list, an RPC using a non-listed flavor (AUTH_SYS/AUTH_NULL) deterministically reaches the type-confused read, and for lockd the out-of-bounds access past the smaller rq_resp allocation is unconditional. The attacker can itself prime the shared per-thread buffer with prior NFSv4.1 compounds and retry indefinitely, so it controls both sides of the stale-data condition.\nPR:N - The path is hit precisely with AUTH_SYS/AUTH_NULL credentials, i.e. before any authentication succeeds — the bug lives in the code that decides whether authentication is required at all. Exports secured with sec=krb5 are routinely exported to wide host lists (`*`), so no credentials on the target are needed.\nUI:N - Exploitation requires only sending crafted NFSv3/NLM RPCs to the server; no administrator or client-side user action is involved.\nS:U - The type confusion, out-of-bounds reads and the bypassed authorization decision all occur within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - A stale `spo_must_allowed` byte makes check_security_flavor() return nfs_ok, bypassing the export's Kerberos requirement and exposing all file contents on that export to an unauthenticated client; additionally the dangling `cstate->clp` and `test_bit()` with an uncontrolled 32-bit index give wide out-of-bounds/use-after-free kernel reads.\nI:H - The same sec= bypass yields write access to a read-write Kerberos-protected export for an unauthenticated AUTH_SYS client, and the code also writes `cstate->spo_must_allowed` back into a mis-typed response buffer, corrupting whatever NFSv3/NLM structure occupies that offset.\nA:H - `cstate->clp` is an uninitialized, stale or out-of-bounds value used directly as a `struct nfs4_client *` and dereferenced (including a strcmp of `cl_cred.cr_raw_principal` and a bit test at an arbitrary 32-bit offset), which readily faults and oopses the nfsd/lockd thread, and the request can be repeated at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"fs/nfsd/nfs4proc.c"
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"version": "0",
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"status": "unaffected",
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"versionType": "semver"
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"version": "5.4.295",
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"lessThanOrEqual": "5.4.*",
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"version": "5.10.239",
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"status": "unaffected",
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{
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"lessThanOrEqual": "6.15.*",
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"version": "6.16",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"title": "nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request",
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"x_generator": {
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"engine": "bippy-1.2.0"
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
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"options": [
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},
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} |