[UPDATE] [high] Linux Kernel: Multiple vulnerabilities
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
An attacker can exploit multiple vulnerabilities in the Linux Kernel to escalate their privileges, cause a denial of service condition, or achieve other unspecified effects.
CSIRTS triage
- What
- Multiple vulnerabilities in the Linux Kernel can be exploited to escalate privileges, cause denial of service, or achieve other unspecified effects.
- Who is affected
- Local deployments of the Linux Kernel.
- Urgency
- Remediation is urgent due to high severity and confirmed exploitation.
- Action
- Apply the latest patches to the Linux Kernel.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1232
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.
- Exploitation confirmedCVE-2026-31431Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-314320.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-314330.60% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all EPSS-scored CVEs.
- Exploitation likely imminentCVE-2026-43284EPSS puts this in the most-targeted tier (93.2% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 99.8% of all EPSS-scored CVEs.
- Exploitation likely imminentCVE-2026-43500EPSS puts this in the most-targeted tier (92.9% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 99.8% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-31431 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-31432 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-31433 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-43284 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-43500 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownUSN-8668-1: Linux kernel (GCP) vulnerabilitiesubuntu
- unknownUSN-8665-1: Linux kernel (Raspberry Pi) vulnerabilitiesubuntu
- unknownFragnesia Local Privilege Escalation report via ESP-in-TCP in the Linux Kernelaws
- unknownexploitedOngoing updates on Copy.fail and variantsaws
- unknownexploitedCVE-2026-31431aws
- unknownexploitedDirty Frag and other issues in Amazon Linux kernelsaws
- unknownexploitedMultiple vulnerabilities in SUSE Linux kernel (August 14, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in Ubuntu Linux kernel (August 14, 2026)cert-fr-avis
- unknownUSN-8530-2: Linux kernel (HWE) vulnerabilitiesubuntu
- criticalHitachi Energy APM Edge Productcisa
- highexploited[UPDATE] [high] Linux Kernel (Dirty Frag): Multiple vulnerabilities allow gaining administrator rightscert-bund
- highexploitedCVE-2026-31431: crypto: algif_aead - Revert to operating out-of-placemsrc
Recent advisories for 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.
- unknownUSN-8659-4: Linux kernel (Oracle) vulnerabilityubuntu · 2026-08-26
- unknownUSN-8666-2: Linux kernel (Azure) vulnerabilitiesubuntu · 2026-08-25
- unknownUSN-8630-5: Linux kernel (Raspberry Pi) vulnerabilitiesubuntu · 2026-08-25
- unknownUSN-8658-3: Linux kernel vulnerabilitiesubuntu · 2026-08-25
- unknownUSN-8643-4: Linux kernel vulnerabilitiesubuntu · 2026-08-25
- unknownUSN-8659-3: Linux kernel (Azure) vulnerabilityubuntu · 2026-08-25
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