Linux Kernel up to 6.18.39/7.1.4/7.2-rc1 sctp sctp_free_addr_wq use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.48+

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 6.18.39/7.1.4/7.2-rc1. Impacted is the function sctp_free_addr_wq of the component sctp. Executing a manipulation can lead to use after free. This vulnerability is registered as CVE-2026-72383. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.18.39/7.1.4/7.2-rc1 and classified as very critical. This vulnerability affects the function sctp_free_addr_wq of the component sctp. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: sctp: fix addr_wq_timer race in sctp_free_addr_wq() sctp_free_addr_wq() previously removed addr_wq_timer using timer_delete() while holding addr_wq_lock. However, timer_delete() does not guarantee that a currently running timer handler has completed. This allows a race with sctp_addr_wq_timeout_handler(), where the handler may still run after addr_waitq has been freed, acquire addr_wq_lock, and access freed memory, leading to a use-after-free. Fix this by calling timer_shutdown_sync() before taking addr_wq_lock. This guarantees that any in-flight timer handler has finished and prevents the timer from being re-armed during teardown, making subsequent cleanup safe.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-72383 since 08/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/15/2026).

Upgrading to version 6.18.40, 7.1.5 or 7.2-rc2 eliminates this vulnerability. Applying the patch a8323fb2ab6cd6978f359daeed6688e0cadf32ba/c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1/976c19de0f22a857ba0112f39635f8fd7a257568 is able to eliminate this problem.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.40/7.1.5/7.2-rc2
Patch: a8323fb2ab6cd6978f359daeed6688e0cadf32ba/c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1/976c19de0f22a857ba0112f39635f8fd7a257568

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72383 (🔒)
GCVE (CVE): GCVE-0-2026-72383
GCVE (VulDB): GCVE-100-391000

Entryinfo

Created: 08/15/2026 16:54
Changes: 08/15/2026 16:54 (59)
Complete: 🔍
Cache ID: 216::103

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