CVE-2026-74666

Local system crash via packet-ring race

Published Aug 22, 2026 · Updated Aug 27, 2026

Race condition in the Linux kernel packet subsystem allows local users to crash the system through packet-socket ring reconfiguration. packet_set_ring() cleared the RX ring under sk_receive_queue.lock but published the receive hook after unlocking, letting packet_poll() or packet_recvmsg() call __packet_rcv_has_room() on stale or NULL storage. Reaching the flaw requires local low-privileged access and a race between ring reconfiguration and pressure clearing; the supported consequence is a kernel crash.

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

Race condition in the Linux kernel packet subsystem allows local users to crash the system through packet-socket ring reconfiguration. packet_set_ring() cleared the RX ring under sk_receive_queue.lock but published the receive hook after unlocking, letting packet_poll() or packet_recvmsg() call __packet_rcv_has_room() on stale or NULL storage. Reaching the flaw requires local low-privileged access and a race between ring reconfiguration and pressure clearing; the supported consequence is a kernel crash.

The record

CVE
CVE-2026-74666
Published
Aug 22, 2026
Updated
Aug 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <1a35da325cac4d5bcad76a2aa943408a6f1d9000
  2. Affected versionversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <2c7b5eb87b2b288cdbde825f21d2b83b2f5da747
  3. Affected versionversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <8cfb2e71926a682f36c4240067d424074dd8f70f
  4. Affected versionversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <a08196c3cc105947746ec21309edfbb60275fcdb
  5. Affected versionversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <ad740b4990347521f0db260d381f9f74e7b340ba
  6. Affected versionversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <bf3c8e86bc8ad111be3f3136125e255344bcb3da
  7. Affected versionversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <cf8189b82bb93f219ab740e0346c919ad65ada62
  8. Affected versionversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <f015c9de92b731814059a343b765c60c0196225c
  9. Affected versionversion=4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <1a35da325cac4d5bcad76a2aa943408a6f1d9000; version=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <2c7b5eb87b2b288cdbde825f21d2b83b2f5da747; version=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <8cfb2e71926a682f36c4240067d424074dd8f70f; version=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <a08196c3cc105947746ec21309edfbb60275fcdb; version=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <ad740b4990347521f0db260d381f9f74e7b340ba; version=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <bf3c8e86bc8ad111be3f3136125e255344bcb3da; version=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <cf8189b82bb93f219ab740e0346c919ad65ada62; version=2ccdbaa6d55b0656244ba57c4b56765a0af76c0a <f015c9de92b731814059a343b765c60c0196225c; version=4.2

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux 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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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