CVE-2026-31644

Kernel memory corruption via stale RX descriptors

Published Apr 24, 2026 · Updated Apr 24, 2026

Use-after-free in the LAN966x FDMA driver in Linux Kernel allows local users to corrupt kernel memory during a failed buffer reload. lan966x_fdma_reload() frees old RX pages before new allocation succeeds, then restarts DMA with descriptors still pointing to those released pages. Reaching the path requires CAP_NET_ADMIN on a physical LAN966x netdev and an RX-buffer allocation failure; subsequent traffic can overwrite memory reassigned to other kernel subsystems.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the LAN966x FDMA driver in Linux Kernel allows local users to corrupt kernel memory during a failed buffer reload. lan966x_fdma_reload() frees old RX pages before new allocation succeeds, then restarts DMA with descriptors still pointing to those released pages. Reaching the path requires CAP_NET_ADMIN on a physical LAN966x netdev and an RX-buffer allocation failure; subsequent traffic can overwrite memory reassigned to other kernel subsystems.

The record

CVE
CVE-2026-31644
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=6.12
  2. Affected versionversion=89ba464fcf548d64bc7215dfe769f791330ae8b6 <59c3d55a946cacdb4181600723c20ac4f4c20c84
  3. Affected versionversion=89ba464fcf548d64bc7215dfe769f791330ae8b6 <691082c0b93c13a5e068c0905f673060bddc204e
  4. Affected versionversion=89ba464fcf548d64bc7215dfe769f791330ae8b6 <92a673019943770930e2a8bfd52e1aad47a1fc1f
  5. Affected versionversion=89ba464fcf548d64bc7215dfe769f791330ae8b6 <9950e9199b3dfdfbde0b8d96ba947d7b11243801

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=89ba464fcf548d64bc7215dfe769f791330ae8b6 <59c3d55a946cacdb4181600723c20ac4f4c20c84; version=89ba464fcf548d64bc7215dfe769f791330ae8b6 <691082c0b93c13a5e068c0905f673060bddc204e; version=89ba464fcf548d64bc7215dfe769f791330ae8b6 <92a673019943770930e2a8bfd52e1aad47a1fc1f; version=89ba464fcf548d64bc7215dfe769f791330ae8b6 <9950e9199b3dfdfbde0b8d96ba947d7b11243801

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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