CVE-2026-72469 (GCVE-0-2026-72469)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44
VLAI
EPSS
VEX
Title
xprtrdma: Fix ep kref imbalance on ADDR_CHANGE
Summary
In the Linux kernel, the following vulnerability has been resolved:
xprtrdma: Fix ep kref imbalance on ADDR_CHANGE
rpcrdma_cm_event_handler() falls through to the disconnected: label
on RDMA_CM_EVENT_ADDR_CHANGE and calls rpcrdma_ep_put() with no
matching get when the event arrives before RDMA_CM_EVENT_ESTABLISHED.
The kref then underflows during connect teardown and
rpcrdma_xprt_disconnect() operates on a freed ep.
Reference counts across a normal connection lifecycle:
rpcrdma_ep_create() kref_init ->1
rpcrdma_xprt_connect() ep_get ->2 (before post_recvs)
RDMA_CM_EVENT_ESTABLISHED ep_get ->3
RDMA_CM_EVENT_DISCONNECTED ep_put ->2
rpcrdma_xprt_drain() ep_put ->1
rpcrdma_xprt_disconnect() tail ep_put ->0 (ep_destroy)
The connect-time get in rpcrdma_xprt_connect(), taken just before
rpcrdma_post_recvs() "while there are outstanding Receives," is
balanced by rpcrdma_xprt_drain. ADDR_CHANGE before ESTABLISHED has
no get to consume, so its put drops the count to 1 and the drain
put then frees the ep while rpcrdma_xprt_disconnect() still holds a
pointer to it.
Fix by dispatching on the prior re_connect_status via xchg(): for
prev == 0 (pre-ESTABLISHED) wake the connect waiter and return with
no put; for prev == 1 call rpcrdma_force_disconnect() and return.
The case-1 arm relies on the subsequent RDMA_CM_EVENT_DISCONNECTED
event -- reliably delivered when rdma_disconnect() is called on a
still-connected cm_id -- to balance the ESTABLISHED get;
rpcrdma_xprt_drain() continues to balance only that connect-time
get. Any other prior value means teardown is already in flight.
Severity
8.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
2acc5cae292355f5f18ad377a2a966e7f03c8fec , < cfd1bab66b042da7a778786685125656c695931b
(git)
Affected: 2acc5cae292355f5f18ad377a2a966e7f03c8fec , < d0479c2b12974aa188b10d221a5770126b118b6d (git) Affected: 2acc5cae292355f5f18ad377a2a966e7f03c8fec , < ffc07790539736a5d029f6a3c966b46c529f93a8 (git) Affected: 2acc5cae292355f5f18ad377a2a966e7f03c8fec , < af9b65b29af341932625c4283dc7a23cdb62688a (git) Affected: 2fcbf07a4f23174a45e015b62a8e42ddbc2e53ef (git) Affected: 5.7.9 , < 5.8 (semver) |
|
| Linux | Linux |
Affected:
5.8
Unaffected: 0 , < 5.8 (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
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"programFiles": [
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"versionType": "semver"
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{
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"versionType": "semver"
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{
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"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "5.8",
"vulnerable": true
},
{
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{
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Fix ep kref imbalance on ADDR_CHANGE\n\nrpcrdma_cm_event_handler() falls through to the disconnected: label\non RDMA_CM_EVENT_ADDR_CHANGE and calls rpcrdma_ep_put() with no\nmatching get when the event arrives before RDMA_CM_EVENT_ESTABLISHED.\nThe kref then underflows during connect teardown and\nrpcrdma_xprt_disconnect() operates on a freed ep.\n\nReference counts across a normal connection lifecycle:\n\n rpcrdma_ep_create() kref_init -\u003e1\n rpcrdma_xprt_connect() ep_get -\u003e2 (before post_recvs)\n RDMA_CM_EVENT_ESTABLISHED ep_get -\u003e3\n RDMA_CM_EVENT_DISCONNECTED ep_put -\u003e2\n rpcrdma_xprt_drain() ep_put -\u003e1\n rpcrdma_xprt_disconnect() tail ep_put -\u003e0 (ep_destroy)\n\nThe connect-time get in rpcrdma_xprt_connect(), taken just before\nrpcrdma_post_recvs() \"while there are outstanding Receives,\" is\nbalanced by rpcrdma_xprt_drain. ADDR_CHANGE before ESTABLISHED has\nno get to consume, so its put drops the count to 1 and the drain\nput then frees the ep while rpcrdma_xprt_disconnect() still holds a\npointer to it.\n\nFix by dispatching on the prior re_connect_status via xchg(): for\nprev == 0 (pre-ESTABLISHED) wake the connect waiter and return with\nno put; for prev == 1 call rpcrdma_force_disconnect() and return.\nThe case-1 arm relies on the subsequent RDMA_CM_EVENT_DISCONNECTED\nevent -- reliably delivered when rdma_disconnect() is called on a\nstill-connected cm_id -- to balance the ESTABLISHED get;\nrpcrdma_xprt_drain() continues to balance only that connect-time\nget. Any other prior value means teardown is already in flight."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The bug is in the NFS/RPC-over-RDMA client reached during RDMA CM connect/reconnect to a remote server; ADDR_CHANGE is delivered on bonded RoCE/IB netdev failover on the storage network segment, a plausible adjacent-network trigger in HPC and cloud NFS-over-RDMA deployments.\nAC:L - Once NFS-over-RDMA is in use, an attacker can reliably drive repeated reconnect attempts and time or induce bonding failover so ADDR_CHANGE arrives pre-ESTABLISHED; the resulting kref underflow and UAF are deterministic, not a probabilistic memory-layout race.\nPR:N - Exploitation requires no privileges on the victim host\u2014only that NFS-over-RDMA is configured and reconnects occur\u2014while an adjacent attacker or malicious storage peer can provoke link failover and connection churn without authenticating to the victim system.\nUI:N - No victim user interaction is required beyond normal automated NFS-over-RDMA client reconnect activity already performed by the kernel when links fail or sessions drop.\nS:U - Impact is kernel memory corruption and potential local privilege escalation within the same kernel security domain, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - Premature free of rpcrdma_ep leaves dangling pointers used in rpcrdma_xprt_disconnect (rdma_disconnect, ib_drain_rq/sq), a classic kernel heap UAF that can be leveraged for arbitrary memory disclosure via controlled reuse of the freed endpoint object.\nI:H - Teardown continues to operate on the freed endpoint and associated RDMA/IB state, enabling heap corruption and potential arbitrary kernel write or control-flow hijack, not merely a benign NULL dereference crash.\nA:H - The kref imbalance causes premature endpoint destruction during disconnect teardown, which can trigger kernel oops/panic from use-after-free even when exploitation for code execution is not attempted."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:44:33.996Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/cfd1bab66b042da7a778786685125656c695931b"
},
{
"url": "https://git.kernel.org/stable/c/d0479c2b12974aa188b10d221a5770126b118b6d"
},
{
"url": "https://git.kernel.org/stable/c/ffc07790539736a5d029f6a3c966b46c529f93a8"
},
{
"url": "https://git.kernel.org/stable/c/af9b65b29af341932625c4283dc7a23cdb62688a"
}
],
"title": "xprtrdma: Fix ep kref imbalance on ADDR_CHANGE",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72469",
"datePublished": "2026-08-15T05:57:11.829Z",
"dateReserved": "2026-08-09T03:40:39.934Z",
"dateUpdated": "2026-08-17T05:44:33.996Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-72469",
"date": "2026-10-14",
"epss": "0.00379",
"percentile": "0.30218"
},
"nvd": {
"cve": {
"affected": [
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"affectedData": [
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"product": "Linux",
"programFiles": [
"net/sunrpc/xprtrdma/verbs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"version": "2acc5cae292355f5f18ad377a2a966e7f03c8fec",
"versionType": "git"
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}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Fix ep kref imbalance on ADDR_CHANGE\n\nrpcrdma_cm_event_handler() falls through to the disconnected: label\non RDMA_CM_EVENT_ADDR_CHANGE and calls rpcrdma_ep_put() with no\nmatching get when the event arrives before RDMA_CM_EVENT_ESTABLISHED.\nThe kref then underflows during connect teardown and\nrpcrdma_xprt_disconnect() operates on a freed ep.\n\nReference counts across a normal connection lifecycle:\n\n rpcrdma_ep_create() kref_init -\u003e1\n rpcrdma_xprt_connect() ep_get -\u003e2 (before post_recvs)\n RDMA_CM_EVENT_ESTABLISHED ep_get -\u003e3\n RDMA_CM_EVENT_DISCONNECTED ep_put -\u003e2\n rpcrdma_xprt_drain() ep_put -\u003e1\n rpcrdma_xprt_disconnect() tail ep_put -\u003e0 (ep_destroy)\n\nThe connect-time get in rpcrdma_xprt_connect(), taken just before\nrpcrdma_post_recvs() \"while there are outstanding Receives,\" is\nbalanced by rpcrdma_xprt_drain. ADDR_CHANGE before ESTABLISHED has\nno get to consume, so its put drops the count to 1 and the drain\nput then frees the ep while rpcrdma_xprt_disconnect() still holds a\npointer to it.\n\nFix by dispatching on the prior re_connect_status via xchg(): for\nprev == 0 (pre-ESTABLISHED) wake the connect waiter and return with\nno put; for prev == 1 call rpcrdma_force_disconnect() and return.\nThe case-1 arm relies on the subsequent RDMA_CM_EVENT_DISCONNECTED\nevent -- reliably delivered when rdma_disconnect() is called on a\nstill-connected cm_id -- to balance the ESTABLISHED get;\nrpcrdma_xprt_drain() continues to balance only that connect-time\nget. Any other prior value means teardown is already in flight."
}
],
"id": "CVE-2026-72469",
"lastModified": "2026-08-17T06:19:14.773",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:22:20.997",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/af9b65b29af341932625c4283dc7a23cdb62688a"
},
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cfd1bab66b042da7a778786685125656c695931b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d0479c2b12974aa188b10d221a5770126b118b6d"
},
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"url": "https://git.kernel.org/stable/c/ffc07790539736a5d029f6a3c966b46c529f93a8"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-19T18:09:54+00:00",
"cve": "CVE-2026-72469",
"id": "CVE-2026-72469",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "246",
"product_status:known_not_affected": "28",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: xprtrdma: Fix ep kref imbalance on ADDR_CHANGE",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72469.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:27:34Z",
"cve": "CVE-2026-72469",
"id": "CVE-2026-72469",
"initial_release_date": "2026-08-27T16:52:17Z",
"product_status:known_affected": "578",
"product_status:known_not_affected": "143",
"product_status:recommended": "252",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-72469",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72469.json",
"version": "11"
}
}
}
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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.
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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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