239 lines
14 KiB
JSON
239 lines
14 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-2026-72317",
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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": "2026-08-09T03:40:39.919Z",
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"datePublished": "2026-08-15T05:55:31.022Z",
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"dateUpdated": "2026-10-16T18:55:17.145Z"
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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": "2026-08-17T05:42:43.024Z"
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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: pin upper rpc_clnt across the TLS connect_worker\n\nThe TLS connect path has a use-after-free: nothing pins the\nupper rpc_clnt across the delayed connect_worker. xs_connect()\nstores task->tk_client in sock_xprt::clnt as a raw pointer\nand queues the worker; for TLS-secured transports that worker\nis xs_tcp_tls_setup_socket(), which reads several fields out\nof the saved pointer (cl_timeout, cl_program, cl_prog,\ncl_vers, cl_cred, cl_stats) to construct the args for the\ninner handshake rpc_clnt.\n\nThe xprt does not reference the rpc_clnt; the rpc_clnt\nreferences the xprt. xs_destroy() does cancel the\nconnect_worker, but it runs only when the xprt's refcount\ndrops to zero, which cannot happen until the rpc_clnt\nreleases its cl_xprt reference in rpc_free_client_work().\nWhen a TLS handshake fails fatally (for example, an mTLS\nmount whose client cert does not match the server), the\nconnecting task is woken with -EACCES and exits, the mount\ncaller invokes rpc_shutdown_client(), and the upper rpc_clnt\nis freed before the queued connect_worker fires.\nxs_tcp_tls_setup_socket() then dereferences the freed clnt,\nproducing the refcount_t underflow Michael Nemanov reported.\n\nTake a reference on the upper rpc_clnt in xs_connect() for\nTLS transports via a new rpc_hold_client() helper, and drop\nit in the connect_worker's exit path with rpc_release_client().\nThe xprt_lock_connect() / xprt_unlock_connect() pairing\nalready serialises xs_connect() with xs_tcp_tls_setup_socket(),\nso the take and release are balanced one-for-one.\n\nThe non-TLS connect worker (xs_tcp_setup_socket) never reads\nsock_xprt::clnt, so leave that path alone and avoid the\nclnt-holds-xprt-holds-clnt cycle that would otherwise prevent\nxprt destruction."
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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 the SUNRPC TCP-with-TLS client connect_worker processing a remote NFS server's TLS handshake; a malicious or misconfigured server can induce fatal handshake failure over the network before the delayed worker runs, matching network-reachable kTLS/RPC-with-TLS client paths.\nAC:L - An attacker operating a reachable NFS endpoint can reliably cause fatal TLS handshake failure (e.g., reject mTLS client certificates or send TLS alerts) and influence reconnect timing/backoff so client teardown frees rpc_clnt before the queued connect_worker executes.\nPR:N - Exploitation requires no privileges on the victim host; a remote peer only needs the client kernel to initiate or re-establish an NFS RPC-with-TLS connection, and TLS handshake processing occurs before NFS authentication completes.\nUI:N - No further victim action is needed once an NFS xprtsec=tls/mtls mount exists because automatic reconnect after server-induced disconnect or handshake failure can trigger the race without additional user interaction.\nS:U - Impact is confined to kernel memory corruption and privilege boundaries within the same host; this is standard local kernel compromise rather than crossing VM, container, or IOMMU security scopes.\nC:H - This is a kernel heap use-after-free where xs_tcp_tls_setup_socket reads multiple fields from a freed rpc_clnt (including cl_cred and cl_program), enabling information disclosure and further exploitation beyond a simple crash.\nI:H - Use-after-free of rpc_clnt permits corrupting allocator metadata and adjacent kernel objects; freed-object reuse can yield arbitrary write or control-flow hijack primitives, not merely authenticated data alteration.\nA:H - Accessing the freed rpc_clnt produces a refcount_t underflow and kernel oops/panic; even unsuccessful exploitation typically crashes or hangs the system, and repeated reconnect attempts can deny availability."
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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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"include/linux/sunrpc/clnt.h",
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"net/sunrpc/clnt.c",
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"net/sunrpc/xprtsock.c"
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],
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"versions": [
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{
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"version": "75eb6af7acdf566c68d61e98e67ee2f235201c02",
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"lessThan": "79cd550f8c884523b604fbfa43eb02def74d6224",
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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": "75eb6af7acdf566c68d61e98e67ee2f235201c02",
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"lessThan": "7a65b41b657b71d5a77861f47dd13eb4bc8e10d0",
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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": "75eb6af7acdf566c68d61e98e67ee2f235201c02",
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"lessThan": "5b0427ba582d143a364301f825f4e32272f06d2d",
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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": "75eb6af7acdf566c68d61e98e67ee2f235201c02",
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"lessThan": "d49f6d098ed48775b9d27a9f9c5c220fdf76f102",
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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": "75eb6af7acdf566c68d61e98e67ee2f235201c02",
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"lessThan": "46bc86c833956219bbfd246c1ffd832a479c5199",
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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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"include/linux/sunrpc/clnt.h",
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"net/sunrpc/clnt.c",
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"net/sunrpc/xprtsock.c"
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],
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"versions": [
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{
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"version": "6.5",
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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": "6.5",
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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": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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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": "6.5",
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"versionEndExcluding": "6.6.145"
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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": "6.5",
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"versionEndExcluding": "6.12.97"
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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": "6.5",
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"versionEndExcluding": "6.18.40"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.5",
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"versionEndExcluding": "7.1.5"
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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": "6.5",
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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/79cd550f8c884523b604fbfa43eb02def74d6224"
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},
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{
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"url": "https://git.kernel.org/stable/c/7a65b41b657b71d5a77861f47dd13eb4bc8e10d0"
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},
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{
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"url": "https://git.kernel.org/stable/c/5b0427ba582d143a364301f825f4e32272f06d2d"
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},
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{
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"url": "https://git.kernel.org/stable/c/d49f6d098ed48775b9d27a9f9c5c220fdf76f102"
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},
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{
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"url": "https://git.kernel.org/stable/c/46bc86c833956219bbfd246c1ffd832a479c5199"
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}
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],
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"title": "SUNRPC: pin upper rpc_clnt across the TLS connect_worker",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-72317",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:46:35.255796Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T18:55:17.145Z"
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}
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}
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]
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}
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} |