CVE-2026-64450: tipc: fix out-of-bounds read in broadcast Gap ACK blocks

mediumCVSS 6.1CVE-2026-64450

CSIRTS triage

vendor: Linux product: KernelOther

What: This vulnerability involves an out-of-bounds read in broadcast Gap ACK blocks in the TIPC protocol.
Who is affected: Deployments of the Linux kernel using TIPC are affected.
Urgency: Remediation is necessary to prevent potential data leaks, though exploitation is not confirmed.
Action: Apply the latest kernel patches that address this issue.

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 6.1
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64450

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-2026-644500.54% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64450	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

criticalCVE-2026-64450: In the Linux kernel, the following vulnerability has been resolved: tipc: fix out-of-bounds re…nvd

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-2026-64543: In the Linux kernel, the following vulnerability has been resolved: tipc: fix use-after-free o…nvd · 2026-07-27
criticalCVE-2026-64450: In the Linux kernel, the following vulnerability has been resolved: tipc: fix out-of-bounds re…nvd · 2026-07-25
highCVE-2026-63801: In the Linux kernel, the following vulnerability has been resolved: tipc: fix slab-use-after-f…nvd · 2026-07-19
highCVE-2026-63801: tipc: fix slab-use-after-free Read in tipc_aead_decrypt_donemsrc · 2026-07-14
criticalCVE-2026-52993: tipc: fix double-free in tipc_buf_append()msrc · 2026-06-09