Threat database

USN-8087-1 fixed a vulnerability in python-cryptography. This update provides the corresponding update to Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. Original advisory details: It was discovered that python-cryptography incorrectly handled subgroup validation for SECT curves. A remote attacker could use this issue to perform a subgroup attack and possibly recover the least significant bits of private keys.

It was discovered that libpng did not properly handle memory when processing certain PNG files. An attacker could possibly use this issue to cause libpng to crash, resulting in a denial of service, or disclose sensitive information. (CVE-2025-64505) Joshua Inscoe discovered that libpng did not properly handle memory when processing certain PNG files. An attacker could possibly use this issue to cause libpng to crash, resulting in a denial of service, disclose sensitive information, or execute arbitrary code. (CVE-2026-25646)

It was discovered that improper initialization of CPU cache memory could allow a local attacker with hypervisor access to overwrite SEV-SNP guest memory resulting in loss of data integrity. (CVE-2024-36331) Oleksii Oleksenko, Cedric Fournet, Jana Hofmann, Boris Köpf, Stavros Volos, and Flavien Solt discovered that some AMD processors may allow an attacker to infer data from previous stores, potentially resulting in the leakage of privileged information. A local attacker could possibly use this to expose sensitive information. (CVE-2024-36350, CVE-2024-36357) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM32 architecture; - ARM64 architecture; - MIPS architecture; - PA-RISC architecture; - PowerPC architecture; - RISC-V architecture; - S390 architecture; - x86 architecture; - Block layer subsystem; - Cryptographic API; - Compute Acceleration Framework; - ACPI drivers; - Serial ATA and Parallel ATA drivers; - ATM drivers; - Drivers core; - ATA over ethernet (AOE) driver; - DRBD Distributed Replicated Block Device drivers; - Network block device driver; - Ublk userspace block driver; - Bluetooth drivers; - Bus devices; - Character device driver; - TPM device driver; - Clock framework and drivers; - Data acquisition framework and drivers; - CPU frequency scaling framework; - Hardware crypto device drivers; - Device frequency scaling framework; - Buffer Sharing and Synchronization framework; - DMA engine subsystem; - EDAC drivers; - Arm Firmware Framework for ARMv8-A(FFA); - ARM SCMI message protocol; - FPGA Framework; - GPU drivers; - HID subsystem; - Hardware monitoring drivers; - HW tracing; - I2C subsystem; - I3C subsystem; - IIO subsystem; - InfiniBand drivers; - Input Device core drivers; - Input Device (Miscellaneous) drivers; - IOMMU subsystem; - IRQ chip drivers; - MCB driver; - Multiple devices driver; - Media drivers; - Multifunction device drivers; - Microchip PCI driver; - Intel Management Engine Interface driver; - PCI Endpoint Test driver; - TI TPS6594 PFSM driver; - VMware VMCI Driver; - MMC subsystem; - MTD block device drivers; - Network drivers; - Mellanox network drivers; - STMicroelectronics network drivers; - NVDIMM (Non-Volatile Memory Device) drivers; - NVME drivers; - PCI subsystem; - Amlogic Meson DDR PMU; - PHY drivers; - Pin controllers subsystem; - x86 platform drivers; - Power supply drivers; - Powercap sysfs driver; - PTP clock framework; - PWM drivers; - RapidIO drivers; - Voltage and Current Regulator drivers; - Remote Processor subsystem; - S/390 drivers; - SCSI subsystem; - ASPEED SoC drivers; - QCOM SoC drivers; - Samsung SoC drivers; - SPI subsystem; - small TFT LCD display modules; - Media staging drivers; - TCM subsystem; - Trusted Execution Environment drivers; - Thunderbolt and USB4 drivers; - TTY drivers; - UFS subsystem; - Cadence USB3 driver; - ChipIdea USB driver; - USB Device Class drivers; - USB core drivers; - DesignWare USB3 driver; - USB Gadget drivers; - USB Host Controller drivers; - Renesas USBHS Controller drivers; - USB Type-C support driver; - USB Type-C Connector System Software Interface driver; - VFIO drivers; - Virtio Host (VHOST) subsystem; - Backlight driver; - Framebuffer layer; - TSM Common Guest driver; - Virtio drivers; - Xen hypervisor drivers; - File systems infrastructure; - BTRFS file system; - Ceph distributed file system; - EFI Variable file system; - Ext4 file system; - F2FS file system; - GFS2 file system; - JFFS2 file system; - JFS file system; - Network file system (NFS) client; - Network file system (NFS) server daemon; - NILFS2 file system; - NTFS3 file system; - Overlay file system; - Proc file system; - SMB network file system; - DRM display driver; - Asynchronous Transfer Mode (ATM) subsystem; - BPF subsystem; - Memory Management; - Internal shared memory driver; - LZO compression library; - Mellanox drivers; - padata parallel execution mechanism; - Networking subsytem; - Bluetooth subsystem; - Netfilter; - Network traffic control; - SCTP protocol; - Network sockets; - UDP network protocol; - eXpress Data Path; - XFRM subsystem; - Digital Audio (PCM) driver; - Universal MIDI packet (UMP) support module; - Tracing infrastructure; - User-space API (UAPI); - io_uring subsystem; - IPC subsystem; - Perf events; - Kernel exit() syscall; - IRQ subsystem; - Padata parallel execution mechanism; - Kernel command line parsing driver; - Hibernation control; - RCU subsystem; - Restartable seuqences system call mechanism; - Maple Tree data structure library; - Memory management; - KASAN memory debugging fra

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - SMB network file system; (CVE-2025-22037, CVE-2025-37899)

Yarden Porat discovered that Pillow incorrectly handled certain malformed PSD images. An attacker could use this issue to cause Pillow to crash, resulting in a denial of service, or possibly execute arbitrary code.

Titouan Lazard discovered that MUNGE contained an exploitable buffer overflow in munged (the MUNGE authentication daemon). A local attacker could possibly use this issue to forge MUNGE credentials, leading to arbitrary code execution.

It was discovered that the libpng simplified API incorrectly handled quantizing RGB images. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service.

It was discovered that the libpng simplified API incorrectly processed palette PNG images with partial transparency and gamma correction. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. (CVE-2025-66293) Petr Simecek, Stanislav Fort and Pavel Kohout discovered that the libpng simplified API incorrectly processed interlaced 16-bit PNGs with 8-bit output format and non-minimal row strides. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. (CVE-2026-22695) Cosmin Truta discovered that the libpng simplified API incorrectly handled invalid row strides. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-22801) It was discovered that the libpng simplified API incorrectly handled quantizing RGB images. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service. (CVE-2026-25646)