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CVE-2026-10037

Sandbox Escape in Ubuntu OpenJDK Packages via xdg-desktop-portal

A sandbox escape vulnerability exists in the OpenJDK packages provided in Ubuntu. The .jar MIME handlers installed by these packages execute files marked as executable when the mailcap package is installed. A compromised or malicious sandboxed application with access to the OpenURI portal via xdg-desktop-portal-gtk can write a malicious .jar file to the host file system, set its executable bit, and trigger the handler to execute arbitrary code outside of the sandbox environment.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu
CVE-2026-12411

Broken Access Control in Canonical LXD DevLXD API

Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest to mount, read, and overwrite another guest's custom storage volume via a crafted device PATCH request over /dev/lxd when security.devlxd.management.volumes is enabled.

CVSS 3.1 · 8.4 High EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Lxd
CVE-2026-9640

LXD Snapshot Import Privilege Escalation Vulnerability

A privilege escalation vulnerability exists in LXD from 6.0 before 6.9, 5.21.0 before 5.21.5, and 5.0.0 before 5.0.7 regarding the handling of project-restriction policies during snapshot restoration.. An authenticated project operator in a restricted multi-tenant environment can bypass policy restrictions by importing a maliciously crafted instance backup containing restricted configuration keys within a snapshot. When the snapshot is restored, these restricted keys are applied to the live instance without policy validation. Starting the modified instance grants the operator unauthorized host root access.

CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Lxd
CVE-2026-9639

Authenticated Denial of Service via Malicious Backup Tarball in LXD

Nil-pointer dereference in CreateCustomVolumeFromBackup in LXD up to version 6.8 and 5.21 on Linux allows an authenticated user with can_create_storage_volumes permissions to cause a denial of service via a specially crafted custom-volume backup tarball that omits the expires_at snapshot field.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical Linux
Products
Lxd Linux Kernel
CVE-2026-28385

SSRF via image import from URL allows internal network probing by authenticated users

In Canonical LXD versions 4.12 through 6.9, a Server-Side Request Forgery (SSRF) vulnerability in the image import functionality allows authenticated users with the can_create_images entitlement to interact with internal network infrastructure via the /images endpoint. When importing an image from a URL source, the LXD daemon fails to validate or restrict outbound destination IP addresses, allowing connections to loopback, RFC1918 private ranges, and cloud metadata endpoints. This enables error-based port scanning and unauthorized interaction with internal HTTP services from the daemon's network position.

CVSS 3.1 · 5 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Lxd
CVE-2026-10720

MicroCeph path traversal issue in the remote-import API

Canonical MicroCeph versions from the squid and tentacle track are vulnerable to a path traversal issue in the remote-import API. Holders of a trusted cluster mTLS certificate (such as enrolled cluster members) or join token can manipulate files in an imported remote cluster within the /var/snap/microceph confinement. This would allow daemon disruption and pollution of the cluster state.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Microceph
CVE-2026-12249

Canonical ADSys Trust Store Poisoning via Plaintext HTTP Certificate Auto-Enrollment

An issue was discovered in Canonical ADSys upstream versions through v0.16.2. During Active Directory Certificate Services (AD CS) certificate auto-enrollment via the vendored Samba client script (internal/policies/certificate/python/vendor_samba/gp/gp_cert_auto_enroll_ext.py), ADSys utilizes a plaintext HTTP connection (http://) instead of a secure HTTPS connection (https://) to request the CA certificate from the Active Directory Certificate Services server (GetCACert). An unauthenticated network attacker positioned between the managed Ubuntu host and the configured AD CS CA hostname can conduct a Man-in-the-Middle (MITM) attack. By intercepting the plaintext HTTP request, the attacker can supply an arbitrary, attacker-controlled Root CA certificate. Because the system automatically accepts this certificate and registers it into the local system trust store via update-ca-certificates, this results in system-wide trust store poisoning. Consequently, TLS clients utilizing the operating system trust store on the affected machine will accept rogue certificates for arbitrary domains, enabling persistent decryption and interception of subsequent TLS connections. This issue is resolved in version v0.16.3.

CVSS 4.0 · 9 Critical EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Adsys
CVE-2022-29581

kernel: use-after-free due to improper update of reference count in net/sched/cls_u32.c

Improper Update of Reference Count vulnerability in net/sched of Linux Kernel allows local attacker to cause privilege escalation to root. This issue affects: Linux Kernel versions prior to 5.18; version 4.14 and later versions.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Canonical Debian Linux and 2 more
Products
Ubuntu Linux Debian Linux Linux Kernel and 19 more
CVE-2026-47334

Deadlock or kernel panic in Ubuntu Linux AppArmor notification handling

Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock in notification handling code. The bug can be triggered by an unprivileged local user and can result in kernel panic or deadlock.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47333

Out-of-bounds read in Ubuntu Linux AppArmor notification handling

Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the size of an internal buffer, leading to a heap memory out-of-bounds read in notification handling code. The bug can be triggered by an unprivileged local user and can result in invalid data being processed by the AppArmor DFA policy engine.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47332

Out-of-bounds read in Ubuntu Linux AppArmor notification handling

Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an internal structure, leading to an out-of-bounds read in notification handling code. The bug can be triggered by an unprivileged local user and can result in information disclosure from adjacent slab objects.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47331

Use-after-free in Ubuntu Linux AppArmor notification handling

Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An unprivileged local user could trigger the race condition that can lead to a use-after-free (UAF) and, theoretically, arbitrary code execution.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47330

Use of uninitialized value in Ubuntu Linux AppArmor notification handling

Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an uninitialized variable in notification handling code. The bug can be triggered by an unprivileged local user and can result in the incorrect caching of AppArmor notification responses.

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47329

Incorrect validation of field size in Ubuntu Linux AppArmor notification responses

Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches which fail to validate invalid sizes of the name field in AppAmor notification responses. The bug can be triggered by an unprivileged local user and could result in handling of crafted responses.

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47328

Invalid pointer deallocation in Ubuntu Linux AppArmor notification handling

Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly attempt to free a pointer which was not previously kmalloc()d, while at the same time leaking allocated memory. The bug can be triggered by an unprivileged local user and can result in the corruption of slab metadata and could lead to resource exhaustion.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47327

NULL pointer dereference in Ubuntu Linux AppArmor notification handling

Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor notifications. The bug can be triggered by an unprivileged local user. This can lead to a kernel oops.

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-47326

Memory leak in Ubuntu Linux AppArmor large notification response allocation

Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a memory leak in the handling of big responses to AppArmor notifications. The bug can be triggered by an unprivileged local user. The memory leak could lead to resource exhaustion.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Linux
CVE-2026-6369

Exposed Session Token in canonical-livepatch client snap

An improper access control vulnerability in the canonical-livepatch snap client prior to version 10.15.0 allows a local unprivileged user to obtain a sensitive, root-level authentication token by sending an unauthenticated request to the livepatchd.sock Unix domain socket. This vulnerability is exploitable on systems where an administrator has already enabled the Livepatch client with a valid Ubuntu Pro subscription. This token allows an attacker to access Livepatch services using the victim's credentials, as well as potentially cause issues to the Livepatch server.

CVSS 4.0 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical
Products
Canonical-livepatch Livepatch Client
CVE-2026-3888

Local Privilege Escalation in snapd

Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS.

CVSS 3.1 · 7.8 High EPSS 1.4% KEV · Not listed
Vendors
Canonical
Products
Ubuntu Ubuntu Linux
CVE-2022-0492

kernel: cgroups v1 release_agent feature may allow privilege escalation

A vulnerability was found in the Linux kernel’s cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function. This flaw, under certain circumstances, allows the use of the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation unexpectedly.

CVSS 3.1 · 7.8 High EPSS 5.5% KEV · Listed
Vendors
Canonical Debian Fedoraproject and 3 more
Products
Ubuntu Linux Debian Linux Fedora and 36 more