CVE-2026-97565Network attack vector

Kernel over-read via truncated SMB1 response

Published Sep 25, 2026 · Updated Sep 25, 2026

Out-of-bounds read in the Linux CIFS client allows remote attackers to trigger a kernel over-read via a truncated SMB1 READ response. CIFSSMBRead() dereferences DataLengthHigh, DataLength, and DataOffset before confirming rsp_iov.iov_len can hold the full READ_RSP header. Reachability requires an explicit vers=1.0 mount because SMB1 is not negotiated by default; depending on mapped memory, the over-read exposes adjacent kernel data or triggers a kernel oops.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux CIFS client allows remote attackers to trigger a kernel over-read via a truncated SMB1 READ response. CIFSSMBRead() dereferences DataLengthHigh, DataLength, and DataOffset before confirming rsp_iov.iov_len can hold the full READ_RSP header. Reachability requires an explicit vers=1.0 mount because SMB1 is not negotiated by default; depending on mapped memory, the over-read exposes adjacent kernel data or triggers a kernel oops.

The record

CVE
CVE-2026-97565
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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 <0f1f77b821506a4dacab6ce7d29cf9e0c26f14cd
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aaa221c1b1d288845b55e9c366e5ef608dfff49d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6142a8bfc230c7263eb8b0475249c958ce49367
  4. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0f1f77b821506a4dacab6ce7d29cf9e0c26f14cd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aaa221c1b1d288845b55e9c366e5ef608dfff49d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6142a8bfc230c7263eb8b0475249c958ce49367; version=2.6.12

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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