CVE-2026-64033 (GCVE-0-2026-64033)
Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38
VLAI
EPSS
VEX
Title
RDMA/rtrs: Fix use-after-free in path file creation cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved:
RDMA/rtrs: Fix use-after-free in path file creation cleanup
In the error path of rtrs_srv_create_path_files(), the sysfs root folders
may already have been created and srv_path->kobj may already have been
initialized. If a later step fails, the cleanup currently calls
kobject_put(&srv_path->kobj) before
rtrs_srv_destroy_once_sysfs_root_folders(srv_path).
kobject_put() may drop the last reference to srv_path->kobj and invoke the
release callback, rtrs_srv_release(), which frees srv_path. The following
call to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then
dereferences srv_path internally to access srv_path->srv, resulting in a
use-after-free.
This failure path is reached before rtrs_srv_create_path_files() returns
success, so the successful-path lifetime handling is not involved.
Fix this by destroying the sysfs root folders before calling
kobject_put(&srv_path->kobj), so srv_path is still valid while the helper
accesses it.
This issue was found by a static analysis tool I am developing.
Severity
9.8 (Critical)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
bab17b761c8974a869b04462be5d4dd9aad366b4 , < 01e42aabaf7632beb4bf235c7238b96c746d4144
(git)
Affected: ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 , < 548f3956e53a7f7bde912d8129010b8986d5e602 (git) Affected: ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 , < 00904a73272b9f3ef3952fe69a833909dccad1ef (git) Affected: ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 , < 92060ab1c5115674cf319175550f85f68405121f (git) Affected: ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 , < eae62c5451e67e8b033c1681fd3b85d7e9a9a28f (git) Affected: ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 , < b0e9706fb2859064bb6c677554c4d20c713aa8e0 (git) Affected: ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 , < 5b74373390113fba798a76b483837029ab010fef (git) Affected: 5.15.61 , < 5.15.209 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.17
Unaffected: 0 , < 5.17 (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rtrs: Fix use-after-free in path file creation cleanup\n\nIn the error path of rtrs_srv_create_path_files(), the sysfs root folders\nmay already have been created and srv_path-\u003ekobj may already have been\ninitialized. If a later step fails, the cleanup currently calls\nkobject_put(\u0026srv_path-\u003ekobj) before\nrtrs_srv_destroy_once_sysfs_root_folders(srv_path).\n\nkobject_put() may drop the last reference to srv_path-\u003ekobj and invoke the\nrelease callback, rtrs_srv_release(), which frees srv_path. The following\ncall to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then\ndereferences srv_path internally to access srv_path-\u003esrv, resulting in a\nuse-after-free.\n\nThis failure path is reached before rtrs_srv_create_path_files() returns\nsuccess, so the successful-path lifetime handling is not involved.\n\nFix this by destroying the sysfs root folders before calling\nkobject_put(\u0026srv_path-\u003ekobj), so srv_path is still valid while the helper\naccesses it.\n\nThis issue was found by a static analysis tool I am developing."
}
],
"metrics": [
{
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"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable code runs in the RTRS server RDMA CM handler when a remote peer completes connection setup and sends RTRS_MSG_INFO_REQ; the server listens on network addresses via rdma_listen() on IPv6 and IB port spaces (default port 1234, used by rnbd-server).\nAC:L - This is a deterministic cleanup-order UAF, not a race; once the attacker drives sysfs creation into an error path (e.g., via parallel connection attempts causing allocation failures), the bug triggers reliably on every failed setup.\nPR:N - No Linux credentials are required; any remote RTRS/RNBD client that can reach the server\u0027s RDMA listener can complete the pre-authentication connection and info-request handshake that calls rtrs_srv_create_path_files().\nUI:N - Exploitation is fully automated through the RTRS wire protocol and requires no action from a local user or administrator on the target host.\nS:U - Impact is confined to kernel memory corruption and privilege escalation on the RTRS server host; it does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - The use-after-free dereferences freed srv_path memory (including srv_path-\u003esrv) during cleanup, which can leak kernel heap contents or be turned into an arbitrary read primitive through heap grooming.\nI:H - UAF on a kernel heap object enables control of freed memory contents and can be leveraged for arbitrary kernel writes or code execution via heap spraying and structure reuse.\nA:H - The UAF dereference during error cleanup can cause kernel oops/panic on the RTRS server, and successful exploitation can crash or fully compromise the host."
}
]
}
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"title": "RDMA/rtrs: Fix use-after-free in path file creation cleanup",
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"cveId": "CVE-2026-64033",
"datePublished": "2026-07-19T15:39:22.872Z",
"dateReserved": "2026-07-19T07:54:57.028Z",
"dateUpdated": "2026-08-05T12:38:27.449Z",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rtrs: Fix use-after-free in path file creation cleanup\n\nIn the error path of rtrs_srv_create_path_files(), the sysfs root folders\nmay already have been created and srv_path-\u003ekobj may already have been\ninitialized. If a later step fails, the cleanup currently calls\nkobject_put(\u0026srv_path-\u003ekobj) before\nrtrs_srv_destroy_once_sysfs_root_folders(srv_path).\n\nkobject_put() may drop the last reference to srv_path-\u003ekobj and invoke the\nrelease callback, rtrs_srv_release(), which frees srv_path. The following\ncall to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then\ndereferences srv_path internally to access srv_path-\u003esrv, resulting in a\nuse-after-free.\n\nThis failure path is reached before rtrs_srv_create_path_files() returns\nsuccess, so the successful-path lifetime handling is not involved.\n\nFix this by destroying the sysfs root folders before calling\nkobject_put(\u0026srv_path-\u003ekobj), so srv_path is still valid while the helper\naccesses it.\n\nThis issue was found by a static analysis tool I am developing."
}
],
"id": "CVE-2026-64033",
"lastModified": "2026-07-30T14:59:47.950",
"metrics": {
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
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"published": "2026-07-19T16:17:43.493",
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
},
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-08-05T14:21:24+00:00",
"cve": "CVE-2026-64033",
"id": "CVE-2026-64033",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_not_affected": "275",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: RDMA/rtrs: Fix use-after-free in path file creation cleanup",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64033.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "critical",
"current_release_date": "2026-09-30T15:06:27Z",
"cve": "CVE-2026-64033",
"id": "CVE-2026-64033",
"initial_release_date": "2026-07-21T13:01:06Z",
"product_status:known_affected": "489",
"product_status:known_not_affected": "263",
"product_status:recommended": "228",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64033",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64033.json",
"version": "9"
}
}
}
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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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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.
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