CVE-2026-64033Network attack vector

Kernel memory corruption via misordered RDMA cleanup

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in RDMA/rtrs in affected Linux Kernel releases allows remote attackers to cause kernel memory corruption during path cleanup. The rtrs_srv_create_path_files() error path drops the final srv_path->kobj reference before a sysfs cleanup helper dereferences srv_path. Reachability requires a later path-file creation step to fail after both objects are initialized; no crash or code-execution outcome is documented.

CVSS severity9.8
Critical
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in RDMA/rtrs in affected Linux Kernel releases allows remote attackers to cause kernel memory corruption during path cleanup. The rtrs_srv_create_path_files() error path drops the final srv_path->kobj reference before a sysfs cleanup helper dereferences srv_path. Reachability requires a later path-file creation step to fail after both objects are initialized; no crash or code-execution outcome is documented.

The record

CVE
CVE-2026-64033
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.15.61 <5.15.209
  2. Affected versionversion=5.17
  3. Affected versionversion=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <00904a73272b9f3ef3952fe69a833909dccad1ef
  4. Affected versionversion=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <548f3956e53a7f7bde912d8129010b8986d5e602
  5. Affected versionversion=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <5b74373390113fba798a76b483837029ab010fef
  6. Affected versionversion=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <92060ab1c5115674cf319175550f85f68405121f
  7. Affected versionversion=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <b0e9706fb2859064bb6c677554c4d20c713aa8e0
  8. Affected versionversion=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <eae62c5451e67e8b033c1681fd3b85d7e9a9a28f
  9. Affected versionversion=bab17b761c8974a869b04462be5d4dd9aad366b4 <01e42aabaf7632beb4bf235c7238b96c746d4144

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.15.61 <5.15.209; version=5.17; version=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <00904a73272b9f3ef3952fe69a833909dccad1ef; version=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <548f3956e53a7f7bde912d8129010b8986d5e602; version=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <5b74373390113fba798a76b483837029ab010fef; version=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <92060ab1c5115674cf319175550f85f68405121f; version=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <b0e9706fb2859064bb6c677554c4d20c713aa8e0; version=ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 <eae62c5451e67e8b033c1681fd3b85d7e9a9a28f; version=bab17b761c8974a869b04462be5d4dd9aad366b4 <01e42aabaf7632beb4bf235c7238b96c746d4144

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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