CVE-2026-43184Network attack vector

Remote kernel-memory disclosure via uninitialized RNBD responses

Published May 6, 2026 · Updated May 6, 2026

Information disclosure in the Linux Kernel RNBD server allows remote attackers to read stray kernel bytes in response messages. The rnbd_srv_fill_msg_open_rsp() and process_msg_sess_info() paths populate selected response fields without zeroing the full reused RDMA buffers, so padding and reserved bytes retain earlier contents. Exposure requires a reachable RNBD server and a cross-version protocol exchange; the consequence is kernel-memory disclosure only.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux Kernel RNBD server allows remote attackers to read stray kernel bytes in response messages. The rnbd_srv_fill_msg_open_rsp() and process_msg_sess_info() paths populate selected response fields without zeroing the full reused RDMA buffers, so padding and reserved bytes retain earlier contents. Exposure requires a reachable RNBD server and a cross-version protocol exchange; the consequence is kernel-memory disclosure only.

The record

CVE
CVE-2026-43184
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <30868a6a5238849d554295aff3ce61d242d7fad8
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69d26698e4fd44935510553809007151b2fe4db5
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7aac0a30dcf41cdb510526740d9a2ab1520c5d98
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <852475278ca5e96e0c0275950e1a84203e602b33
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b646e54d23b9b592d612a2036aab14e0f6c14206
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c94ede3c436dfbd9cedd9cb69f604f6fc901b6a2
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e2cacec7d4291300a282feb3af8eba57b93b15aa
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4272754063d52c9ad0169865add8816ba696471

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <30868a6a5238849d554295aff3ce61d242d7fad8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <69d26698e4fd44935510553809007151b2fe4db5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7aac0a30dcf41cdb510526740d9a2ab1520c5d98; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <852475278ca5e96e0c0275950e1a84203e602b33; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b646e54d23b9b592d612a2036aab14e0f6c14206; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c94ede3c436dfbd9cedd9cb69f604f6fc901b6a2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e2cacec7d4291300a282feb3af8eba57b93b15aa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4272754063d52c9ad0169865add8816ba696471

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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