DSA-6393-1 linux - security update

CSIRTS triage

What

Several vulnerabilities have been discovered in the Linux kernel that may lead to privilege escalation, denial of service, or information leaks.

Who is affected

Deployments of the Linux kernel are affected by these vulnerabilities.

Urgency

Remediation is urgent due to the potential for privilege escalation and denial of service.

Action

Apply the latest security update to mitigate these vulnerabilities.

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

Details

Source

Debian Security Advisories (INTL · vendor-psirt · site)

Severity

unknown

Published

2026-07-21

Exploitation

Not in CISA KEV at last sync

Original advisory: https://lists.debian.org/debian-security-announce/2026/msg00304.html

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-2025-218070.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.
• Low exploitation riskCVE-2026-460930.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
• Low exploitation riskCVE-2026-530270.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
• Low exploitation riskCVE-2026-532260.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
• Low exploitation riskCVE-2026-533920.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.
• Low exploitation riskCVE-2026-533990.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all scored CVEs.
• Low exploitation riskCVE-2026-534020.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
• Low exploitation riskCVE-2026-638150.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
• Low exploitation riskCVE-2026-638160.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
• Low exploitation riskCVE-2026-638180.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• medium[NEW] [medium] Linux Kernel: Multiple vulnerabilities allow unspecified attackcert-bund
• highUSN-8618-1: Linux kernel vulnerabilitiesubuntu
• medium[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
• highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu
• unknownMultiple vulnerabilities in Debian Linux kernel (July 24, 2026)cert-fr-avis
• highUSN-8593-1: Linux kernel vulnerabilitiesubuntu
• highCVE-2026-64189: In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: fix race…nvd
• unknownCVE-2026-64187: In the Linux kernel, the following vulnerability has been resolved: xfs: fail recovery on a co…nvd
• highUSN-8569-1: Linux kernel (HWE) vulnerabilitiesubuntu
• highUSN-8568-1: Linux kernel (OEM) vulnerabilitiesubuntu
• highUSN-8566-1: Linux kernel vulnerabilitiesubuntu
• highCVE-2026-63818: In the Linux kernel, the following vulnerability has been resolved: f2fs: validate orphan inod…nvd

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