CVE-2025-38123Network attack vector

System panic via stale t7xx netdev dereference

Published Jul 3, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel t7xx WWAN driver allows remote attackers to panic systems through crafted cellular traffic. The RX NAPI poll dereferences a stale ccmni_inst entry after dellink releases its netdev, then passes the invalid device to napi_gro_receive while updating receive statistics. Exploitation requires an active t7xx cellular data path and concurrent user-plane teardown; the CNA also documents kernel-memory read and write effects.

CVSS severity9.8
Critical
EPSS probability0.41%
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 Linux kernel t7xx WWAN driver allows remote attackers to panic systems through crafted cellular traffic. The RX NAPI poll dereferences a stale ccmni_inst entry after dellink releases its netdev, then passes the invalid device to napi_gro_receive while updating receive statistics. Exploitation requires an active t7xx cellular data path and concurrent user-plane teardown; the CNA also documents kernel-memory read and write effects.

The record

CVE
CVE-2025-38123
Published
Jul 3, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5545b7b9f294de7f95ec6a7cb1de0db52296001c <66542e9430c625f878a5b5dc0fe41e3458d614bf
  2. Affected versionversion=5545b7b9f294de7f95ec6a7cb1de0db52296001c <905fe0845bb27e4eed2ca27ea06e6c4847f1b2b1
  3. Affected versionversion=5545b7b9f294de7f95ec6a7cb1de0db52296001c <cc89f457d9133a558d4e8ef26dc20843c2d12073
  4. Affected versionversion=5545b7b9f294de7f95ec6a7cb1de0db52296001c <e2df04e69c3f10b412f54be036dd0ed3b14756cf
  5. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5545b7b9f294de7f95ec6a7cb1de0db52296001c <66542e9430c625f878a5b5dc0fe41e3458d614bf; version=5545b7b9f294de7f95ec6a7cb1de0db52296001c <905fe0845bb27e4eed2ca27ea06e6c4847f1b2b1; version=5545b7b9f294de7f95ec6a7cb1de0db52296001c <cc89f457d9133a558d4e8ef26dc20843c2d12073; version=5545b7b9f294de7f95ec6a7cb1de0db52296001c <e2df04e69c3f10b412f54be036dd0ed3b14756cf; version=6.2

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8LinuxCVSS: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
T1499Endpoint Denial of Service

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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