CVE-2026-64141Network attack vector

Kernel panic via stale lease entry dereference

Published Jul 19, 2026 · Updated Jul 19, 2026

Null-pointer dereference in Linux Kernel ksmbd allows remote attackers to trigger a kernel panic through crafted SMB2 session traffic. SESSION_LOGOFF clears opinfo->conn but leaves the opinfo in lb->lease_list; find_same_lease_key() later passes it to compare_guid_key(), which dereferences the null pointer. Exploitation requires SMB2 SESSION_SETUP, reuse of the ClientGuid after logoff, and a share configured with durable handles enabled.

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

Null-pointer dereference in Linux Kernel ksmbd allows remote attackers to trigger a kernel panic through crafted SMB2 session traffic. SESSION_LOGOFF clears opinfo->conn but leaves the opinfo in lb->lease_list; find_same_lease_key() later passes it to compare_guid_key(), which dereferences the null pointer. Exploitation requires SMB2 SESSION_SETUP, reuse of the ClientGuid after logoff, and a share configured with durable handles enabled.

The record

CVE
CVE-2026-64141
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
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=6.6.32 <6.6.142
  2. Affected versionversion=6.9
  3. Affected versionversion=8df4bcdb0a4232192b2445256c39b787d58ef14d <e43cb36d4d7827710cfcd48e95e29a507f0d87be
  4. Affected versionversion=c8efcc786146a951091588e5fa7e3c754850cb3c <0836081b394ca074d1b910f2b990ff7b4b4404c7
  5. Affected versionversion=c8efcc786146a951091588e5fa7e3c754850cb3c <4b83cbc4c15f09b000cc06f033f64b0824b6dc87
  6. Affected versionversion=c8efcc786146a951091588e5fa7e3c754850cb3c <af86896ca3239e25a6bd7d352213371265073d38
  7. Affected versionversion=c8efcc786146a951091588e5fa7e3c754850cb3c <cd5c1b75d2f454f625d7dc55bd3ae21d0855f6ad

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.6.32 <6.6.142; version=6.9; version=8df4bcdb0a4232192b2445256c39b787d58ef14d <e43cb36d4d7827710cfcd48e95e29a507f0d87be; version=c8efcc786146a951091588e5fa7e3c754850cb3c <0836081b394ca074d1b910f2b990ff7b4b4404c7; version=c8efcc786146a951091588e5fa7e3c754850cb3c <4b83cbc4c15f09b000cc06f033f64b0824b6dc87; version=c8efcc786146a951091588e5fa7e3c754850cb3c <af86896ca3239e25a6bd7d352213371265073d38; version=c8efcc786146a951091588e5fa7e3c754850cb3c <cd5c1b75d2f454f625d7dc55bd3ae21d0855f6ad

Published CVSS scores

7.5Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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