CVE-2026-64109

Kernel memory disclosure via unlocked AF_UNIX tail dereference

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in the AF_UNIX stream receiver in Linux Kernel allows local users to expose kernel memory through a receive race. unix_stream_data_wait() calls skb_peek_tail() without queue locking and dereferences tail->len after a concurrent normal recv() can unlink and free the SKB. Triggering requires two local threads sharing a stream socket, with one peeking past queued data while the other consumes it; the stale read can disclose kernel memory or crash the kernel.

CVSS severity8.8
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 AF_UNIX stream receiver in Linux Kernel allows local users to expose kernel memory through a receive race. unix_stream_data_wait() calls skb_peek_tail() without queue locking and dereferences tail->len after a concurrent normal recv() can unlink and free the SKB. Triggering requires two local threads sharing a stream socket, with one peeking past queued data while the other consumes it; the stale read can disclose kernel memory or crash the kernel.

The record

CVE
CVE-2026-64109
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
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

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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=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <26342087fac93b3932e6af61dc91ec029cb8a623
  2. Affected versionversion=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <38bccb927d83d7d52e5b20015a172a0b6101d11e
  3. Affected versionversion=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <5f162f95a95834f06a8ec6140889272ad12e842f
  4. Affected versionversion=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <acdff9907478e82208475b1151700d0b71dcdc63
  5. Affected versionversion=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <be309f8eae8b474a4a617eaae01324da996fc719
  6. Affected versionversion=4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <26342087fac93b3932e6af61dc91ec029cb8a623; version=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <38bccb927d83d7d52e5b20015a172a0b6101d11e; version=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <5f162f95a95834f06a8ec6140889272ad12e842f; version=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <acdff9907478e82208475b1151700d0b71dcdc63; version=2b514574f7e88c8498027ee366fd6e7aae5aa4b5 <be309f8eae8b474a4a617eaae01324da996fc719; version=4.2

Published CVSS scores

8.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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.

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Technologies

Your stack

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Your stack

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