159 lines
9.1 KiB
JSON
159 lines
9.1 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-2026-72220",
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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": "2026-08-09T03:40:39.913Z",
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"datePublished": "2026-08-15T05:54:13.800Z",
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"dateUpdated": "2026-08-17T05:41:41.598Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:41:41.598Z"
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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\nsunrpc: harden rq_procinfo lifecycle to prevent double-free\n\nThe svc_release_rqst() function executes the callback inside\nrqstp->rq_procinfo->pc_release. However, if a worker thread begins\nprocessing a new request and encounters an early error path (e.g.,\nunsupported protocol, short frame, or bad auth) before a valid\nrq_procinfo is installed, a stale release hook can be re-triggered\nagainst reused state from the previous RPC, resulting in a double-free\nor use-after-free vulnerability.\n\nHarden the lifecycle of rq_procinfo by:\n1. Ensuring svc_release_rqst() always clears rq_procinfo after the\n optional pc_release() call, regardless of whether the hook exists.\n2. Explicitly clearing rq_procinfo at request entry in svc_process()\n before any early decode or drop paths.\n3. Ensuring svc_process_bc() does the same at backchannel entry.\n\nThis guarantees that error flows will not encounter a non-NULL stale\nrq_procinfo pointer when there is nothing to release."
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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 flaw is in server-side SUNRPC request handling reached from remote RPC over TCP/UDP/RDMA transports used by nfsd and lockd (svc_recv→svc_handle_xprt→svc_process), exploitable by sending crafted ONC/RPC packets to listening NFS/NLM ports.\nAC:L - An attacker controls the RPC sequence and timing (valid request then malformed/short/bad-auth/bad-prog packet on the same pooled worker) to reliably re-trigger a stale pc_release without depending on uncontrollable layout or victim state.\nPR:N - Trigger paths include pre-authentication failures (garbage credentials, unknown program/version, short frames) that still call svc_release_rqst; stale rq_procinfo can be left by any prior RPC on the same worker, so no attacker credentials are required.\nUI:N - Exploitation requires only network RPC traffic to an already-running NFS/NLM server; no end-user actions such as mounting a share or opening files are needed beyond normal server exposure.\nS:U - Impact is kernel heap corruption and privilege escalation within the host kernel context; it does not inherently cross a VM, container, or IOMMU security boundary to another authority.\nC:H - The bug is an explicit double-free/use-after-free of per-request NFS release state (e.g. nfsd4_release_compoundargs kfree/vfree chains and fh_put paths), enabling arbitrary kernel memory disclosure when exploited.\nI:H - Re-invoking pc_release on reused svc_rqst buffers corrupts heap metadata and object lifetimes, providing a standard kernel double-free/UAF primitive suitable for arbitrary write and code execution.\nA:H - Repeated or mistimed pc_release calls can immediately panic the kernel via SLUB double-free detection, oops, or wedged nfsd worker threads, causing complete loss of availability on NFS-serving systems."
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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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"vendor": "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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"programFiles": [
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"net/sunrpc/svc.c"
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],
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"versions": [
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{
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"version": "d9adbb6e10bf7d4223d3d521ede1b2052903bc5e",
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"lessThan": "66014ab165cb01bfef5836939412a8ef98d5d5ff",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d9adbb6e10bf7d4223d3d521ede1b2052903bc5e",
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"lessThan": "31ba490c02d476a5e4f90b8845932ac9db8aa71b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d9adbb6e10bf7d4223d3d521ede1b2052903bc5e",
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"lessThan": "18d216788bef06332ff8901670ecf1ed8f6eb614",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sunrpc/svc.c"
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],
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"versions": [
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{
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"version": "6.18",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.18",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.40",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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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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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "6.18.40"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "7.1.5"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/66014ab165cb01bfef5836939412a8ef98d5d5ff"
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},
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{
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"url": "https://git.kernel.org/stable/c/31ba490c02d476a5e4f90b8845932ac9db8aa71b"
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},
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{
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"url": "https://git.kernel.org/stable/c/18d216788bef06332ff8901670ecf1ed8f6eb614"
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}
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],
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"title": "sunrpc: harden rq_procinfo lifecycle to prevent double-free",
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