CVE-2026-64037Network attack vector

Memory corruption via zero-size TSO segmentation

Published Jul 19, 2026 · Updated Jul 19, 2026

Memory corruption in the iwlwifi MLD driver in Linux Kernel allows remote attackers to crash affected systems via sustained TCP traffic. iwl_mld_tx_tso_segment() treats the AMSDU-disabled sentinel value 1 as a usable length, derives zero subframes, and passes a zero gso_size to skb_gso_segment(), which creates tens of thousands of tiny segments and can corrupt TCP retransmit state. Reachability requires an Intel Wi-Fi 7 adapter using the MLD path while firmware has disabled AMSDU for a TID; the resulting memory corruption can produce a retransmit-queue use-after-free and kernel crash.

CVSS severity9.8
Critical
EPSS probability0.43%
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 the iwlwifi MLD driver in Linux Kernel allows remote attackers to crash affected systems via sustained TCP traffic. iwl_mld_tx_tso_segment() treats the AMSDU-disabled sentinel value 1 as a usable length, derives zero subframes, and passes a zero gso_size to skb_gso_segment(), which creates tens of thousands of tiny segments and can corrupt TCP retransmit state. Reachability requires an Intel Wi-Fi 7 adapter using the MLD path while firmware has disabled AMSDU for a TID; the resulting memory corruption can produce a retransmit-queue use-after-free and kernel crash.

The record

CVE
CVE-2026-64037
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.15
  2. Affected versionversion=d1e879ec600f9b3bdd253167533959facfefb17b <92cee08dc4f00e77fd1317e4343c5d458b0abab7
  3. Affected versionversion=d1e879ec600f9b3bdd253167533959facfefb17b <9e360e610a73f62432e986775023d5382773f045
  4. Affected versionversion=d1e879ec600f9b3bdd253167533959facfefb17b <cbe1c8245e4469d1aa6e12e5d913611376d23788

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.15; version=d1e879ec600f9b3bdd253167533959facfefb17b <92cee08dc4f00e77fd1317e4343c5d458b0abab7; version=d1e879ec600f9b3bdd253167533959facfefb17b <9e360e610a73f62432e986775023d5382773f045; version=d1e879ec600f9b3bdd253167533959facfefb17b <cbe1c8245e4469d1aa6e12e5d913611376d23788

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux Kernel CVE TeamCVSS: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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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