CVE-2026-64545Network attack vector

Kernel panic via unchecked XDP master pointer

Published Jul 27, 2026 · Updated Jul 27, 2026

NULL pointer dereference in Linux Kernel allows remote attackers to panic the kernel via XDP_TX during bond-slave release. The xdp_master_redirect() path trusts netdev_master_upper_dev_get_rcu() and reads master->flags after bond teardown has removed the upper-master adjacency. Exploitation requires an XDP_TX packet to hit the narrow release window while IFF_SLAVE remains set, causing a kernel panic without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.50%
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 allows remote attackers to panic the kernel via XDP_TX during bond-slave release. The xdp_master_redirect() path trusts netdev_master_upper_dev_get_rcu() and reads master->flags after bond teardown has removed the upper-master adjacency. Exploitation requires an XDP_TX packet to hit the narrow release window while IFF_SLAVE remains set, causing a kernel panic without reported data disclosure or modification.

The record

CVE
CVE-2026-64545
Published
Jul 27, 2026
Updated
Jul 27, 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 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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=5.15
  2. Affected versionversion=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <03b743586a2469744e96e9c1015096d07240935d
  3. Affected versionversion=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <3876318ea54e83eb70982b8280a3c5e4e32269bf
  4. Affected versionversion=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <4edbcacca09f92b85d3951b6add11894b20a84bc
  5. Affected versionversion=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <89c103d702b25ceb2d097faf854deb47b53b17ff
  6. Affected versionversion=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <c99ca049e910d61ddbd28cc2c47242f2bfbb4970
  7. Affected versionversion=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e2a56441233131fe18a76001de347ecda217e40c
  8. Affected versionversion=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e82d8cc4321c373dc46e741cd2dfdaa7921fddb7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.15; version=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <03b743586a2469744e96e9c1015096d07240935d; version=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <3876318ea54e83eb70982b8280a3c5e4e32269bf; version=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <4edbcacca09f92b85d3951b6add11894b20a84bc; version=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <89c103d702b25ceb2d097faf854deb47b53b17ff; version=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <c99ca049e910d61ddbd28cc2c47242f2bfbb4970; version=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e2a56441233131fe18a76001de347ecda217e40c; version=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 <e82d8cc4321c373dc46e741cd2dfdaa7921fddb7

Published CVSS scores

7.5kernel.orgCVSS: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
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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