CVE-2026-89784 (GCVE-0-2026-89784)
Vulnerability from cvelistv5 – Published: 2026-09-16 08:48 – Updated: 2026-10-19 08:52
VLAI
EPSS
VEX
Title
SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6
Summary
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6
rpcb_register_inet4() and rpcb_register_inet6() store the result of
rpc_sockaddr2uaddr() into map->r_addr without checking it for NULL.
rpc_sockaddr2uaddr() returns NULL when its final kstrdup() fails, and
the unchecked NULL is then carried into the synchronous RPCBPROC_SET
encode path: rpcb_register_call() -> rpc_call_sync() ->
rpcb_enc_getaddr() -> encode_rpcb_string(), whose first statement is
strlen(string), dereferencing NULL and oopsing the kernel.
The crash reproduces under failslab on v6.12; with KASAN the NULL
dereference surfaces as a fault on the shadow of address zero:
Oops: general protection fault, probably for non-canonical address
0xdffffc0000000000 [#1] PREEMPT SMP KASAN
RIP: 0010:strlen (lib/string.c:409)
Call Trace:
encode_rpcb_string (net/sunrpc/rpcb_clnt.c:890)
rpcb_enc_getaddr (net/sunrpc/rpcb_clnt.c:910)
rpcauth_wrap_req_encode (net/sunrpc/auth.c:745)
call_encode (net/sunrpc/clnt.c:1966)
__rpc_execute (net/sunrpc/sched.c:952)
rpc_run_task (net/sunrpc/clnt.c:1243)
rpc_call_sync (net/sunrpc/clnt.c:1272)
rpcb_v4_register (net/sunrpc/rpcb_clnt.c:500)
svc_generic_rpcbind_set
nfsd_rpcbind_set
svc_register
svc_setup_socket
svc_addsock
write_ports
nfsctl_transaction_write
vfs_write
The crash is reachable when an in-kernel RPC service (nfsd, lockd,
nfs-callback) registers with the local rpcbind under enough memory
pressure for the small GFP_KERNEL kstrdup() in rpc_sockaddr2uaddr() to
fail. The asynchronous getport path already handles this exact failure
mode by returning -ENOMEM; only the two register helpers omit the check.
Mirror that handling: bail out with -ENOMEM when rpc_sockaddr2uaddr()
returns NULL, before the address is fed into the encoder.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d77385f23830ee6c400569bac8b37e6eb3b7d360 , < 04441b792ec40eb66349b5fab34b6a2090b5b2dd
(git)
Affected: d77385f23830ee6c400569bac8b37e6eb3b7d360 , < 5a51c49ddb37b883566874aecc66bc5a2e617a96 (git) Affected: d77385f23830ee6c400569bac8b37e6eb3b7d360 , < 4a6095de8cb1858e05bdf70b3e7d6d7645c25041 (git) Affected: d77385f23830ee6c400569bac8b37e6eb3b7d360 , < 12bf3e0182ccdaf3b412756a756d3944a7dacaa9 (git) Affected: d77385f23830ee6c400569bac8b37e6eb3b7d360 , < 4e01022974355732e748ec8ebc97c558cb624ffe (git) Affected: d77385f23830ee6c400569bac8b37e6eb3b7d360 , < cda4aacfb0bbf5c0f90fd0b42c72c749635d1368 (git) Affected: d77385f23830ee6c400569bac8b37e6eb3b7d360 , < eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6 (git) Affected: d77385f23830ee6c400569bac8b37e6eb3b7d360 , < fd22370226a0d8109045d0831fd5aaadee921693 (git) |
guessed | |
| Linux | Linux |
Affected:
3.2
Unaffected: 0 , < 3.2 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
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"version": "5.10.270",
"versionType": "semver"
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{
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"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
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{
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{
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"version": "7.2.6",
"versionType": "semver"
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{
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}
]
}
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6\n\nrpcb_register_inet4() and rpcb_register_inet6() store the result of\nrpc_sockaddr2uaddr() into map-\u003er_addr without checking it for NULL.\nrpc_sockaddr2uaddr() returns NULL when its final kstrdup() fails, and\nthe unchecked NULL is then carried into the synchronous RPCBPROC_SET\nencode path: rpcb_register_call() -\u003e rpc_call_sync() -\u003e\nrpcb_enc_getaddr() -\u003e encode_rpcb_string(), whose first statement is\nstrlen(string), dereferencing NULL and oopsing the kernel.\n\nThe crash reproduces under failslab on v6.12; with KASAN the NULL\ndereference surfaces as a fault on the shadow of address zero:\n\n Oops: general protection fault, probably for non-canonical address\n 0xdffffc0000000000 [#1] PREEMPT SMP KASAN\n RIP: 0010:strlen (lib/string.c:409)\n Call Trace:\n encode_rpcb_string (net/sunrpc/rpcb_clnt.c:890)\n rpcb_enc_getaddr (net/sunrpc/rpcb_clnt.c:910)\n rpcauth_wrap_req_encode (net/sunrpc/auth.c:745)\n call_encode (net/sunrpc/clnt.c:1966)\n __rpc_execute (net/sunrpc/sched.c:952)\n rpc_run_task (net/sunrpc/clnt.c:1243)\n rpc_call_sync (net/sunrpc/clnt.c:1272)\n rpcb_v4_register (net/sunrpc/rpcb_clnt.c:500)\n svc_generic_rpcbind_set\n nfsd_rpcbind_set\n svc_register\n svc_setup_socket\n svc_addsock\n write_ports\n nfsctl_transaction_write\n vfs_write\n\nThe crash is reachable when an in-kernel RPC service (nfsd, lockd,\nnfs-callback) registers with the local rpcbind under enough memory\npressure for the small GFP_KERNEL kstrdup() in rpc_sockaddr2uaddr() to\nfail. The asynchronous getport path already handles this exact failure\nmode by returning -ENOMEM; only the two register helpers omit the check.\n\nMirror that handling: bail out with -ENOMEM when rpc_sockaddr2uaddr()\nreturns NULL, before the address is fed into the encoder."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:52:36.983Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/04441b792ec40eb66349b5fab34b6a2090b5b2dd"
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"url": "https://git.kernel.org/stable/c/5a51c49ddb37b883566874aecc66bc5a2e617a96"
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{
"url": "https://git.kernel.org/stable/c/4a6095de8cb1858e05bdf70b3e7d6d7645c25041"
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},
{
"url": "https://git.kernel.org/stable/c/fd22370226a0d8109045d0831fd5aaadee921693"
}
],
"title": "SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6",
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"cveId": "CVE-2026-89784",
"datePublished": "2026-09-16T08:48:22.404Z",
"dateReserved": "2026-09-11T19:38:34.766Z",
"dateUpdated": "2026-10-19T08:52:36.983Z",
"state": "PUBLISHED"
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"vulnerability-lookup:meta": {
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"cve": "CVE-2026-89784",
"date": "2026-10-29",
"epss": "0.00216",
"percentile": "0.1208"
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"id": "msrc_CVE-2026-89784",
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"product_status:fixed": "1",
"product_status:known_affected": "2",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89784.json",
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{
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{
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"version": "6.12.110",
"versionType": "semver"
},
{
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"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6\n\nrpcb_register_inet4() and rpcb_register_inet6() store the result of\nrpc_sockaddr2uaddr() into map-\u003er_addr without checking it for NULL.\nrpc_sockaddr2uaddr() returns NULL when its final kstrdup() fails, and\nthe unchecked NULL is then carried into the synchronous RPCBPROC_SET\nencode path: rpcb_register_call() -\u003e rpc_call_sync() -\u003e\nrpcb_enc_getaddr() -\u003e encode_rpcb_string(), whose first statement is\nstrlen(string), dereferencing NULL and oopsing the kernel.\n\nThe crash reproduces under failslab on v6.12; with KASAN the NULL\ndereference surfaces as a fault on the shadow of address zero:\n\n Oops: general protection fault, probably for non-canonical address\n 0xdffffc0000000000 [#1] PREEMPT SMP KASAN\n RIP: 0010:strlen (lib/string.c:409)\n Call Trace:\n encode_rpcb_string (net/sunrpc/rpcb_clnt.c:890)\n rpcb_enc_getaddr (net/sunrpc/rpcb_clnt.c:910)\n rpcauth_wrap_req_encode (net/sunrpc/auth.c:745)\n call_encode (net/sunrpc/clnt.c:1966)\n __rpc_execute (net/sunrpc/sched.c:952)\n rpc_run_task (net/sunrpc/clnt.c:1243)\n rpc_call_sync (net/sunrpc/clnt.c:1272)\n rpcb_v4_register (net/sunrpc/rpcb_clnt.c:500)\n svc_generic_rpcbind_set\n nfsd_rpcbind_set\n svc_register\n svc_setup_socket\n svc_addsock\n write_ports\n nfsctl_transaction_write\n vfs_write\n\nThe crash is reachable when an in-kernel RPC service (nfsd, lockd,\nnfs-callback) registers with the local rpcbind under enough memory\npressure for the small GFP_KERNEL kstrdup() in rpc_sockaddr2uaddr() to\nfail. The asynchronous getport path already handles this exact failure\nmode by returning -ENOMEM; only the two register helpers omit the check.\n\nMirror that handling: bail out with -ENOMEM when rpc_sockaddr2uaddr()\nreturns NULL, before the address is fed into the encoder."
}
],
"id": "CVE-2026-89784",
"lastModified": "2026-10-19T09:18:21.953",
"metrics": {},
"published": "2026-09-16T09:17:09.060",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/04441b792ec40eb66349b5fab34b6a2090b5b2dd"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/12bf3e0182ccdaf3b412756a756d3944a7dacaa9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4a6095de8cb1858e05bdf70b3e7d6d7645c25041"
},
{
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"url": "https://git.kernel.org/stable/c/4e01022974355732e748ec8ebc97c558cb624ffe"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5a51c49ddb37b883566874aecc66bc5a2e617a96"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cda4aacfb0bbf5c0f90fd0b42c72c749635d1368"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fd22370226a0d8109045d0831fd5aaadee921693"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-10-29T13:45:50+00:00",
"cve": "CVE-2026-89784",
"id": "CVE-2026-89784",
"initial_release_date": "2026-09-16T00:00:00+00:00",
"product_status:known_affected": "278",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89784.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.