CVE-2026-74427Network attack vector

Kernel memory corruption via AFS teardown race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel AFS allows remote attackers to corrupt kernel memory via concurrent RxRPC callback traffic. During network-namespace teardown, the charger work item can remain queued, and afs_rx_new_call() can requeue it after net->live is cleared, dereferencing freed afs_net state. Valid callback traffic can reach the race before credential verification; successful exploitation can disclose or overwrite kernel memory or crash the host.

CVSS severity9.8
Critical
EPSS probability0.40%
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 Linux kernel AFS allows remote attackers to corrupt kernel memory via concurrent RxRPC callback traffic. During network-namespace teardown, the charger work item can remain queued, and afs_rx_new_call() can requeue it after net->live is cleared, dereferencing freed afs_net state. Valid callback traffic can reach the race before credential verification; successful exploitation can disclose or overwrite kernel memory or crash the host.

The record

CVE
CVE-2026-74427
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <47694fbc9d24ab6bf210f91e8efe06a10a478064
  2. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a
  3. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9
  4. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <85d5fb80fe4f0cc836b6df83f26de204fe102ff7
  5. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <a33975ff2b6ea47b8f29956403374b1cdd057539
  6. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <b83ecf80e28afb7b6595ba79932e77ca68a5a83d
  7. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <eec89c5f8e1adc1de4824042ef75f62aed804153
  8. Affected versionversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1
  9. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <47694fbc9d24ab6bf210f91e8efe06a10a478064; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <85d5fb80fe4f0cc836b6df83f26de204fe102ff7; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <a33975ff2b6ea47b8f29956403374b1cdd057539; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <b83ecf80e28afb7b6595ba79932e77ca68a5a83d; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <eec89c5f8e1adc1de4824042ef75f62aed804153; version=00e907127e6f86d0f9b122d9b4347a8aa09a8b61 <f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1; version=4.9

Published CVSS scores

9.8Linux 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

T1190Exploit Public-Facing Application

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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