CVE-2026-64535: nvmet-tcp: Fix potential UAF when ddgst mismatch

mediumCVSS 5.9CVE-2026-64535

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: NVMe target TCP transport has a potential use-after-free vulnerability when digest mismatch occurs during data integrity checks.
Who is affected: Systems running NVMe target with TCP transport and digest verification enabled.
Urgency: High priority; use-after-free can lead to kernel memory corruption and potential code execution, though not currently exploited.
Action: Apply Linux kernel patch fixing UAF condition in nvmet-tcp digest mismatch handling, or update to a patched kernel version.

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

⚡ Watch Linux kernel

Get an email when a new Linux kernel advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.9
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64535

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-2026-645350.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64535	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 nvmet-tcp

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.

mediumCVE-2026-64534: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error pathmsrc · 2026-08-06
criticalCVE-2026-64535: In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: Fix potential U…nvd · 2026-07-27
criticalCVE-2026-64534: In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: check INIT_FAIL…nvd · 2026-07-27
criticalCVE-2026-52989: nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callersmsrc · 2026-06-09