Multiple vulnerabilities in Debian Linux kernel (August 07, 2026)
Multiple vulnerabilities have been discovered in Debian Linux kernel. They allow an attacker to cause privilege escalation, breach of data integrity and denial of service.
CSIRTS triage
- What
- Multiple kernel vulnerabilities allow privilege escalation, data integrity breaches, and denial of service.
- Who is affected
- Systems running affected Debian Linux kernel versions.
- Urgency
- High; privilege escalation and DoS pose direct threat to availability and confidentiality.
- Action
- Apply Debian Linux kernel security updates when available; prioritize systems requiring high availability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0981/
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-2026-645520.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-642870.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-645380.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-641920.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-644610.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-645420.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-644130.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-645100.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-644050.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-645310.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Referenced CVEs
+12 more CVEs referenced in this advisory.
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
- high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in Red Hat Linux kernel (August 07, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in Debian LTS Linux kernel (August 07, 2026)cert-fr-avis
- medium[NEW] [medium] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund
- medium[NEW] [medium] Linux Kernel: Multiple vulnerabilities allow Denial of Servicecert-bund
- medium[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
- medium[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
- mediumCVE-2026-64371: proc: protect ptrace_may_access() with exec_update_lock (part 1)msrc
- mediumCVE-2026-45944: iommu/vt-d: Clear Present bit before tearing down context entrymsrc
- highCVE-2026-64560: posix-cpu-timers: Prevent UAF caused by non-leader exec() racemsrc
- highCVE-2026-64557: Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()msrc
Recent advisories for Debian Linux kernel
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.
- unknownMultiple vulnerabilities in Debian LTS Linux kernel (August 07, 2026)cert-fr-avis · 2026-08-07
- unknownDebian Linux Kernel Multiple Vulnerabilitieshkcert · 2026-08-06
- unknownMultiple vulnerabilities in Debian LTS Linux kernel (July 31, 2026)cert-fr-avis · 2026-07-31
- unknownMultiple vulnerabilities in Debian LTS Linux kernel (July 24, 2026)cert-fr-avis · 2026-07-24
- unknownMultiple vulnerabilities in Debian Linux kernel (July 24, 2026)cert-fr-avis · 2026-07-24
- unknownMultiple vulnerabilities in Debian LTS Linux kernel (July 10, 2026)cert-fr-avis · 2026-07-10
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