Loading story…
Linux distributors released security updates to fix multiple Linux kernel vulnerabilities that could let attackers bypass security restrictions, trigger denial-of-service conditions, obtain sensitive information, escalate privileges, execute arbitrary code, and gain access to affected systems. The advisory specifically highlighted CVE-2025-10263, a local race condition in Translation Lookaside Buffer invalidation operations rated CVSS 8.4, and CVE-2026-46316, a local guest-to-host escape vulnerability rated CVSS 7.0.
The notice said a proof-of-concept exploit for CVE-2026-46316 has been disclosed and is circulating in the wild, increasing the urgency for remediation. Red Hat and Ubuntu were identified as distributors providing fixes, and organizations were urged to validate and deploy patches promptly and monitor their vendors for any additional kernel-related updates.
Mallory correlates global threat intelligence with your attack surface — know if you’re exposed before adversaries strike.
2 events from the most recent confirmed update back to the earliest known activity.
The advisory stated that a proof-of-concept exploit for CVE-2026-46316 had been disclosed and existed in the wild. No specific date for the exploit disclosure was provided in the source content.
Linux released security updates on June 15, 2026 to address multiple kernel vulnerabilities that could enable security bypass, denial of service, information disclosure, privilege escalation, arbitrary code execution, and unauthorized system access. The notice specifically highlighted CVE-2025-10263 and CVE-2026-46316, and said Red Hat and Ubuntu were providing fixes.
Vulnerabilities, threat actors, malware, products, organizations, and breaches Mallory has linked to this story.
2 references tracked. Mallory keeps watching after this page renders.
Map indicators from this story to your assets and identify affected systems in minutes.
Every observed campaign, victim, and pivot linked to actors named in this story.
Malware, exploits, and IOCs connected to the activity described here.
YARA, Sigma, and Snort rules deployed to your SIEM as soon as they’re published.
Get matching new stories delivered to your team as they break — not the next morning.
Ask questions about this story and take action on the answers.
Other stories Mallory is tracking that overlap on entities, sources, or topic labels.
`CVE-2026-31431` is a Linux kernel flaw classified as **CWE-669: Incorrect Resource Transfer Between Spheres** that can enable local privilege escalation to root and, in some cases, bypass isolation boundaries. The Canadian Centre for Cyber Security warned that the impact becomes more severe when the bug is chained with a remote code execution vulnerability, and urged organizations to identify exposed systems, apply vendor fixes, reboot after kernel updates, restrict access, enforce kernel security controls, monitor logs, and segment high-risk or Internet-facing workloads. Vendor and community activity indicates broad exposure across modern Linux platforms. Red Hat lists **RHEL 8**, **RHEL 9**, **RHEL 10**, and corresponding `kernel-rt` packages as affected, while **RHEL 6** and **RHEL 7** are marked not affected because the vulnerable code is absent. Public exploit interest accelerated after Theori published the **"Copy Fail"** technical write-up and proof-of-concept repository, which references testing on **Ubuntu 24.04 LTS**, **Amazon Linux 2023**, **RHEL 10.1**, and **SUSE 16**; Rocky Linux also published related errata, signaling downstream patch availability in enterprise Linux ecosystems.
Jun 29, 2026
Ubuntu disclosed mitigation guidance for **CVE-2026-53359** ("**Januscape**"), a Linux kernel local privilege escalation flaw affecting nested virtualization in **KVM** on Intel and AMD `x86_64` systems. The issue impacts Ubuntu releases from **14.04 through 26.04**, and a public proof-of-concept shows that a guest can crash the hypervisor host; Ubuntu warned that, in cloud environments with nested virtualization enabled, exploitation could potentially compromise the host or other tenants. The advisory said the required fix must be applied to the **hypervisor kernel**, while **unprivileged containers are not affected**; however, privileged containers and systems exposing `/dev/kvm` to non-privileged users may face elevated risk. Canonical's Ubuntu CVE tracker lists **CVE-2026-53359** among several high-priority Linux kernel vulnerabilities marked as affecting Ubuntu package families including `linux`, `linux-hwe`, `linux-hwe-5.4`, `linux-hwe-5.8`, and `linux-hwe-5.11`, with fixes noted as resolved upstream in the Linux kernel. Separate Linux security update notices also highlighted active kernel patching activity for other serious flaws, including **CVE-2026-46331**, a `pedit` subsystem privilege-escalation bug with a disclosed proof-of-concept reported to exist in the wild, and **CVE-2026-52951**, a `drm/xe/dma-buf` use-after-free issue that can trigger denial of service; organizations were urged to test and deploy distributor patches from vendors such as Ubuntu and Red Hat.
Jul 14, 2026
Xen has disclosed two Linux guest kernel vulnerabilities affecting virtualized environments, warning that both issues require patching and have no known mitigations. **CVE-2026-31786** (`XSA-485`) affects Linux kernels **4.13 and later** in Xen domains through unsafe handling of the binary build ID exposed at `/sys/hypervisor/properties/buildid`. The bug uses `sprintf()` on a non-null-terminated binary value, which can trigger an out-of-bounds read and, in rare cases, a write past the 4 KB sysfs buffer, potentially leading to **information disclosure, denial of service, or privilege escalation** inside Linux Xen guests. A second advisory, **CVE-2026-31787** (`XSA-487`), describes a **double-free** flaw in the Linux **Xen `privcmd` driver** that allows a **root user in a Linux guest** to bypass kernel lockdown protections tied to secure boot. Xen said the issue affects Linux **PVH or HVM domains** on **x86 and Arm** from kernel **3.8 onward**, while PV domains and non-Linux guests are not affected. The vulnerabilities were reported by **Frediano Ziglio of XenServer** and **Atharva Vartak (@0xAth4rv)**, respectively, and Xen urged operators to apply the supplied Linux patches.
Jun 29, 2026