CVE-2026-74609: tipc: read le->link under the node lock in tipc_node_link_down()

mediumCVSS 5.2CVE-2026-74609

CSIRTS triage

vendor: Linux product: Linux Kernel Memory corruption

What: Improper synchronization in tipc_node_link_down() where link state is read without adequate locking.
Who is affected: Systems using the TIPC (Transparent Inter-Process Communication) protocol stack on vulnerable kernels.
Urgency: Medium urgency; not currently exploited but race conditions can corrupt protocol state.
Action: Apply kernel patch ensuring le->link is read under node lock in tipc_node_link_down().

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.2
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74609

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-746090.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74609	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for tipc

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-74609: In the Linux kernel, the following vulnerability has been resolved: tipc: read le->link under …nvd · 2026-08-22
highCVE-2026-74490: In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free…nvd · 2026-08-15
highCVE-2026-74283: In the Linux kernel, the following vulnerability has been resolved: tipc: require net admin fo…nvd · 2026-08-15
highCVE-2026-74282: In the Linux kernel, the following vulnerability has been resolved: tipc: prevent snt_unacked …nvd · 2026-08-15
highCVE-2026-74281: In the Linux kernel, the following vulnerability has been resolved: tipc: reject inverted serv…nvd · 2026-08-15
criticalCVE-2026-74255: In the Linux kernel, the following vulnerability has been resolved: tipc: fix UAF in tipc_l2_s…nvd · 2026-08-15