CVE-2026-74490
Received Received - Intake

BaseFortify

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. Other queue dump trace callsites keep their existing output under the locking they already provide, while poll still emits the event itself without walking live queue members from an unlocked context.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74490
EUVD
EUVD-2026-59683

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel tipc *

Helpful Resources

Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a use-after-free vulnerability in the Linux kernel's TIPC (Transparent Inter-Process Communication) module. It occurs when the tipc_poll() function calls a tracepoint that dumps queue state without proper locking. This allows another thread to dequeue and free an skb (socket buffer) while the trace helper is still accessing it, leading to a potential crash or memory corruption.

Detection Guidance

This vulnerability involves a use-after-free in the TIPC socket trace queue dumps. Detection requires checking for kernel logs or crashes related to TIPC operations. Monitor for kernel oops messages or tracepoint-related errors. No specific commands are provided in the context to directly detect this issue.

Impact Analysis

If exploited, this could cause system instability, crashes, or privilege escalation on affected Linux systems using TIPC. Attackers might trigger the flaw to corrupt memory, leading to denial-of-service or arbitrary code execution.

Mitigation Strategies

Apply the latest Linux kernel patches that address this issue. Disable TIPC if not in use by unloading the module (rmmod tipc). If TIPC is required, restrict its use to trusted networks and monitor for suspicious activity. Reboot the system after applying patches.

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