CVE-2026-68417 (GCVE-0-2026-68417)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-19 16:35
VLAI
EPSS
VEX
Title
RDMA/siw: publish QP after initialization
Summary
In the Linux kernel, the following vulnerability has been resolved:
RDMA/siw: publish QP after initialization
siw_create_qp() currently calls siw_qp_add() before the queues, CQ
pointers, state, completion, and device list entry are ready. A QPN
lookup can therefore reach a QP that is still being constructed.
Move siw_qp_add() to the end of siw_create_qp(), after QP
initialization and before adding the QP to the siw device list.
Severity
7.8 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 3c9d128219964dcea897bf6139b88242e987be8f
(git)
Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 3ff82e3841ecab1ff38d5817c969a019d266c83c (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 36e91a58397ca8c978e38a0bf389f0c6113fa8ca (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 74912ad168f87d6b2b670a87987bb302d6e64aa1 (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < 52f9fcb191143448df55fd215ff09c5207fed43e (git) Affected: f29dd55b0236f7a26a4b9dd69186e3c04266797b , < bb27fcc67c429d97f785c92c35a6c5adebb05d7f (git) |
guessed | |
| Linux | Linux |
Affected:
5.3
Unaffected: 0 , < 5.3 (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/infiniband/sw/siw/siw_verbs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3c9d128219964dcea897bf6139b88242e987be8f",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "3ff82e3841ecab1ff38d5817c969a019d266c83c",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "36e91a58397ca8c978e38a0bf389f0c6113fa8ca",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "74912ad168f87d6b2b670a87987bb302d6e64aa1",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "52f9fcb191143448df55fd215ff09c5207fed43e",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "bb27fcc67c429d97f785c92c35a6c5adebb05d7f",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/infiniband/sw/siw/siw_verbs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.148",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.3",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: publish QP after initialization\n\nsiw_create_qp() currently calls siw_qp_add() before the queues, CQ\npointers, state, completion, and device list entry are ready. A QPN\nlookup can therefore reach a QP that is still being constructed.\n\nMove siw_qp_add() to the end of siw_create_qp(), after QP\ninitialization and before adding the QP to the siw device list."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires local access to the RDMA character devices (/dev/infiniband/uverbsN for create_qp and /dev/infiniband/rdma_cm for the QPN lookup); no network packet reaches the racing code path without a local trigger first.\nAC:L - The attacker controls both sides of the race: one thread issues create_qp while another issues rdma_connect/rdma_accept with an attacker-supplied qp_num, and QPNs from xa_alloc(XA_FLAGS_ALLOC1) are predictable. The post-publish failure can be made deterministic by passing a short udata-\u003eoutlen, so the window is wide and repeatable at will.\nPR:L - Any unprivileged local user with access to the siw uverbs and rdma_cm character devices can create QPs and issue rdma_connect/rdma_accept with an arbitrary qp_num; no capability check gates siw_create_qp, siw_connect or siw_accept.\nUI:N - The attacker drives both the QP creation and the concurrent QPN lookup from its own threads; no action by any other user or administrator is needed.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no crossing of a VM, IOMMU or sandbox boundary.\nC:H - The siw_qp object can be kfree\u0027d by the ib core error path while the CM thread still holds a reference, giving a use-after-free on a slab object the attacker can groom and read back through QP/CM state, enabling disclosure of arbitrary kernel memory.\nI:H - After the free, siw_free_qp() performs list_del(\u0026qp-\u003edevq), vfree() of four pointer fields and siw_put_tx_cpu(qp-\u003etx_cpu) using values read from reallocated attacker-controlled memory, yielding arbitrary-pointer free, list-unlink writes and out-of-range per-CPU decrements suitable for control-flow hijacking.\nA:H - Even without exploitation the race reliably causes kernel crashes: NULL sendq/recvq/scq/rcq dereferences, list_del on an uninitialized devq head, waits on an uninitialized qp_free completion, and use-after-free oopses."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:35:15.087Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3c9d128219964dcea897bf6139b88242e987be8f"
},
{
"url": "https://git.kernel.org/stable/c/3ff82e3841ecab1ff38d5817c969a019d266c83c"
},
{
"url": "https://git.kernel.org/stable/c/36e91a58397ca8c978e38a0bf389f0c6113fa8ca"
},
{
"url": "https://git.kernel.org/stable/c/74912ad168f87d6b2b670a87987bb302d6e64aa1"
},
{
"url": "https://git.kernel.org/stable/c/fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d"
},
{
"url": "https://git.kernel.org/stable/c/52f9fcb191143448df55fd215ff09c5207fed43e"
},
{
"url": "https://git.kernel.org/stable/c/bb27fcc67c429d97f785c92c35a6c5adebb05d7f"
}
],
"title": "RDMA/siw: publish QP after initialization",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68417",
"datePublished": "2026-08-10T12:04:37.936Z",
"dateReserved": "2026-07-30T09:28:09.391Z",
"dateUpdated": "2026-08-19T16:35:15.087Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-68417",
"date": "2026-09-30",
"epss": "0.0012",
"percentile": "0.01652"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/infiniband/sw/siw/siw_verbs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3c9d128219964dcea897bf6139b88242e987be8f",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "3ff82e3841ecab1ff38d5817c969a019d266c83c",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "36e91a58397ca8c978e38a0bf389f0c6113fa8ca",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "74912ad168f87d6b2b670a87987bb302d6e64aa1",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "52f9fcb191143448df55fd215ff09c5207fed43e",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
},
{
"lessThan": "bb27fcc67c429d97f785c92c35a6c5adebb05d7f",
"status": "affected",
"version": "f29dd55b0236f7a26a4b9dd69186e3c04266797b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/infiniband/sw/siw/siw_verbs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: publish QP after initialization\n\nsiw_create_qp() currently calls siw_qp_add() before the queues, CQ\npointers, state, completion, and device list entry are ready. A QPN\nlookup can therefore reach a QP that is still being constructed.\n\nMove siw_qp_add() to the end of siw_create_qp(), after QP\ninitialization and before adding the QP to the siw device list."
}
],
"id": "CVE-2026-68417",
"lastModified": "2026-08-19T17:20:49.223",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-10T13:20:35.510",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/36e91a58397ca8c978e38a0bf389f0c6113fa8ca"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3c9d128219964dcea897bf6139b88242e987be8f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3ff82e3841ecab1ff38d5817c969a019d266c83c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/52f9fcb191143448df55fd215ff09c5207fed43e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/74912ad168f87d6b2b670a87987bb302d6e64aa1"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/bb27fcc67c429d97f785c92c35a6c5adebb05d7f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fcc9d50022bcdb1f9f7ed04955c72b4a7355af3d"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-31T11:27:34+00:00",
"cve": "CVE-2026-68417",
"id": "CVE-2026-68417",
"initial_release_date": "2026-08-10T00:00:00+00:00",
"product_status:known_affected": "156",
"product_status:known_not_affected": "121",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: RDMA/siw: publish QP after initialization",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68417.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-10-01T00:43:51Z",
"cve": "CVE-2026-68417",
"id": "CVE-2026-68417",
"initial_release_date": "2026-08-11T23:45:59Z",
"product_status:known_affected": "583",
"product_status:known_not_affected": "97",
"product_status:recommended": "359",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68417",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68417.json",
"version": "16"
}
}
}
Loading…
Loading…
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.
Loading…
Loading…
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.
Loading…
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.
Loading…