CVE-2026-46289Network attack vector

Memory corruption via oversized scatterlist entries

Published Jun 8, 2026 · Updated Jun 8, 2026

Memory corruption in lib/scatterlist.c in Linux Kernel allows remote attackers to read or write kernel memory via encrypted SMB3 traffic. extract_kvec_to_sg() passes the requested length rather than the page-bounded segment length to sg_set_page(), producing entries that cross page boundaries. A malicious SMB server needs an established sealed SMB3 session; consuming the malformed entries can disclose or overwrite adjacent kernel memory or crash the host.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in lib/scatterlist.c in Linux Kernel allows remote attackers to read or write kernel memory via encrypted SMB3 traffic. extract_kvec_to_sg() passes the requested length rather than the page-bounded segment length to sg_set_page(), producing entries that cross page boundaries. A malicious SMB server needs an established sealed SMB3 session; consuming the malformed entries can disclose or overwrite adjacent kernel memory or crash the host.

The record

CVE
CVE-2026-46289
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 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=0185846975339a5c348373aa450a977f5242366b <07b7d66e65d9cfe6b9c2c34aa22cfcaac37a5c45
  2. Affected versionversion=0185846975339a5c348373aa450a977f5242366b <3f17500e86d730c76db638bb3ae52f9b5e496c76
  3. Affected versionversion=0185846975339a5c348373aa450a977f5242366b <8fbba6829057979149d1b37d65690c037f3ddf4d
  4. Affected versionversion=0185846975339a5c348373aa450a977f5242366b <9d38756d0a93b66163554219fa9c3365f40c4035
  5. Affected versionversion=0185846975339a5c348373aa450a977f5242366b <e5e22fc9963469e678c4f4bb38d26adcec107f1e
  6. Affected versionversion=6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0185846975339a5c348373aa450a977f5242366b <07b7d66e65d9cfe6b9c2c34aa22cfcaac37a5c45; version=0185846975339a5c348373aa450a977f5242366b <3f17500e86d730c76db638bb3ae52f9b5e496c76; version=0185846975339a5c348373aa450a977f5242366b <8fbba6829057979149d1b37d65690c037f3ddf4d; version=0185846975339a5c348373aa450a977f5242366b <9d38756d0a93b66163554219fa9c3365f40c4035; version=0185846975339a5c348373aa450a977f5242366b <e5e22fc9963469e678c4f4bb38d26adcec107f1e; version=6.3

Published CVSS scores

9.8Linux kernel CNACVSS: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

CWE-401Missing Release of Memory after Effective Lifetime
T1203Exploitation for Client Execution

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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