CVE-2026-64177Public exploit

Local system hang via inconsistent child-socket locking

Published Jul 19, 2026 · Updated Jul 19, 2026

Deadlock in affected Linux Kernel releases allows local users to hang the system through Phonet PEP child-socket packet delivery. pep_do_rcv() forwards an inbound packet to a child socket via sk_receive_skb() while bottom halves can remain enabled, so the same socket lock is acquired in incompatible process and softirq states. Low-privileged local access and a same-CPU softirq race are required; successful exploitation self-deadlocks the kernel receive path and interrupts system availability.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in affected Linux Kernel releases allows local users to hang the system through Phonet PEP child-socket packet delivery. pep_do_rcv() forwards an inbound packet to a child socket via sk_receive_skb() while bottom halves can remain enabled, so the same socket lock is acquired in incompatible process and softirq states. Low-privileged local access and a same-CPU softirq race are required; successful exploitation self-deadlocks the kernel receive path and interrupts system availability.

The record

CVE
CVE-2026-64177
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-833, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=2.6.28
  2. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <02c04df84de709060f63e1d52ec67488c4f6f212
  3. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <8420aa4900417797323dd567ba9d1512280c2dc3
  4. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <84bc87beb4cd77670939b446326788e4c9b3db37
  5. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <a3fc8f2dacd1c37325977fc1fbbf3d52141df99e
  6. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <b2606c302d7f2b4ee48da05e32ed60aed1b0cd53
  7. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <bd795f106b3889fb0706c6e4831c4b27e2b5666b
  8. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <dbc81608e3a653dea6cf403f20cae35468b8ab9c
  9. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <f08c45076e4fd8b0adbc5eb186d6e6a3e7350d7b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.28; version=9641458d3ec42def729fde64669abf07f3220cd5 <02c04df84de709060f63e1d52ec67488c4f6f212; version=9641458d3ec42def729fde64669abf07f3220cd5 <8420aa4900417797323dd567ba9d1512280c2dc3; version=9641458d3ec42def729fde64669abf07f3220cd5 <84bc87beb4cd77670939b446326788e4c9b3db37; version=9641458d3ec42def729fde64669abf07f3220cd5 <a3fc8f2dacd1c37325977fc1fbbf3d52141df99e; version=9641458d3ec42def729fde64669abf07f3220cd5 <b2606c302d7f2b4ee48da05e32ed60aed1b0cd53; version=9641458d3ec42def729fde64669abf07f3220cd5 <bd795f106b3889fb0706c6e4831c4b27e2b5666b; version=9641458d3ec42def729fde64669abf07f3220cd5 <dbc81608e3a653dea6cf403f20cae35468b8ab9c; version=9641458d3ec42def729fde64669abf07f3220cd5 <f08c45076e4fd8b0adbc5eb186d6e6a3e7350d7b

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-833Deadlock
T1499Endpoint Denial of Service

Public exploit references

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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