CVE-2026-74630

Local privilege escalation via inet6_dev use-after-free

Published Aug 22, 2026 · Updated Aug 25, 2026

Use-after-free in the Linux kernel IPv6 subsystem allows local users to corrupt kernel memory through a multicast source-filter race. The in6_dev_get() helper increments an inet6_dev refcount after RCU lookup without ensuring it remains nonzero, resurrecting an object already queued for freeing. An unprivileged local user can control both sides of the race through IPv6 multicast socket options and virtual-link deletion, causing kernel memory corruption that supports privilege escalation or a 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

Use-after-free in the Linux kernel IPv6 subsystem allows local users to corrupt kernel memory through a multicast source-filter race. The in6_dev_get() helper increments an inet6_dev refcount after RCU lookup without ensuring it remains nonzero, resurrecting an object already queued for freeing. An unprivileged local user can control both sides of the race through IPv6 multicast socket options and virtual-link deletion, causing kernel memory corruption that supports privilege escalation or a crash.

The record

CVE
CVE-2026-74630
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=2.6.19
  2. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <0e243671bc7b8eaf00f83dd2f4367436dc0cff98
  3. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <145812b678de9f3b59780173be3c0d22ed60dd93
  4. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <14e812ab41df0cac033479da835ec9a5de633404
  5. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <1c206d461c680c3151daa3c89fc26eaf5bf98a7f
  6. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <680fbd7942185448eadb990a3d10a53eb946b702
  7. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <785d908f8d21c8bc78b6fb2c2932ab662bf6918a
  8. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8
  9. Affected versionversion=8814c4b533817df825485ff32ce6ac406c3a54d1 <cc5bd568f9b7683e60841b6fd02c10d64535bd6e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.19; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <0e243671bc7b8eaf00f83dd2f4367436dc0cff98; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <145812b678de9f3b59780173be3c0d22ed60dd93; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <14e812ab41df0cac033479da835ec9a5de633404; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <1c206d461c680c3151daa3c89fc26eaf5bf98a7f; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <680fbd7942185448eadb990a3d10a53eb946b702; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <785d908f8d21c8bc78b6fb2c2932ab662bf6918a; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <aedcfefdb5b7ed7f8a6196a3e68a25bdbe51d2f8; version=8814c4b533817df825485ff32ce6ac406c3a54d1 <cc5bd568f9b7683e60841b6fd02c10d64535bd6e

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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