sctp: fix addr_wq_timer race in sctp_free_addr_wq() (CVE-2026-72383) | HOL Guard CVE

High · CVSS 7.8CVE-2026-72383

sctp: fix addr_wq_timer race in sctp_free_addr_wq()

Answer in brief

CVE-2026-72383 records a High severity (CVSS 7.8) vulnerability in sctp: fix addr_wq_timer race in sctp_free_addr_wq(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <a8323fb2ab6cd6978f359daeed6688e0cadf32ba \|\| >=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1 \|\| >=4db67e808640e3934d82ce61ee8e2e89fd877ba8 <976c19de0f22a857ba0112f39635f8fd7a257568	a8323fb2ab6cd6978f359daeed6688e0cadf32ba, c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1, 976c19de0f22a857ba0112f39635f8fd7a257568
Linux/Linuxgeneric	3.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to a8323fb2ab6cd6978f359daeed6688e0cadf32ba if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.