CVE-2026-72383

Kernel memory corruption via SCTP timer race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel SCTP allows local users to corrupt kernel memory through a race during address-work-queue teardown. The sctp_free_addr_wq function deletes addr_wq_timer without waiting for an in-flight sctp_addr_wq_timeout_handler, which can acquire the lock and access addr_waitq after it is freed. Low-privileged local access is required; successful exploitation can corrupt kernel state or crash the system.

CVSS severity7.8
High
EPSS probability0.16%
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 SCTP allows local users to corrupt kernel memory through a race during address-work-queue teardown. The sctp_free_addr_wq function deletes addr_wq_timer without waiting for an in-flight sctp_addr_wq_timeout_handler, which can acquire the lock and access addr_waitq after it is freed. Low-privileged local access is required; successful exploitation can corrupt kernel state or crash the system.

The record

CVE
CVE-2026-72383
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-364, CWE-416, T1068
Attack vector
local
Privileges
authenticated

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=3.7
  2. Affected versionversion=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <976c19de0f22a857ba0112f39635f8fd7a257568
  3. Affected versionversion=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <a8323fb2ab6cd6978f359daeed6688e0cadf32ba
  4. Affected versionversion=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.7; version=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <976c19de0f22a857ba0112f39635f8fd7a257568; version=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <a8323fb2ab6cd6978f359daeed6688e0cadf32ba; version=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.3SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
6.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
5.5Red HatCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-364Signal Handler Race Condition
CWE-416Use After Free
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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