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Ubuntu 24.04: Linux Kernel Azure FIPS Critical Info Exposure CVE-2025-40300

Several security issues were fixed in the Linux kernel.. ========================================================================== Ubuntu Security Notice USN-7940-1 December 17, 2025 linux-azure-fips vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS Details: Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux kernel contained insufficient branch predictor isolation between a guest and a userspace hypervisor for certain processors. This flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this to expose sensitive information from the host OS. (CVE-2025-40300) 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: - ARM64 architecture; - PowerPC architecture; - x86 architecture; - Cryptographic API; - ACPI drivers; - Ublk userspace block driver; - Clock framework and drivers; - EDAC drivers; - GPU drivers; - HSI subsystem; - IIO subsystem; - InfiniBand drivers; - Media drivers; - MemoryStick subsystem; - Network drivers; - NTB driver; - PCI subsystem; - Remote Processor subsystem; - Thermal drivers; - Virtio Host (VHOST) subsystem; - 9P distributed file system; - File systems infrastructure; - JFS file system; - Network file system (NFS) server daemon; - NTFS3 file system; - SMB network file system; - Memory management; - Bluetooth subsystem; - RDMA verbs API; - Kernel fork() syscall; - Timer subsystem; - Tracing infrastructure; - Watch queue notification mechanism; - Appletalk network protocol; - Asynchronous Transfer Mode (ATM)subsystem; - Networking core; - IPv4 networking; - IPv6 networking; - Netfilter; - Network traffic control; - SCTP protocol; - TLS protocol; - SoC Audio for Freescale CPUs drivers; (CVE-2023-53034, CVE-2024-58092, CVE-2025-21729, CVE-2025-22018, CVE-2025-22019, CVE-2025-22020, CVE-2025-22021, CVE-2025-22025, CVE-2025-22027, CVE-2025-22028, CVE-2025-22033, CVE-2025-22035, CVE-2025-22036, CVE-2025-22038, CVE-2025-22039, CVE-2025-22040, CVE-2025-22041, CVE-2025-22042, CVE-2025-22044, CVE-2025-22045, CVE-2025-22047, CVE-2025-22050, CVE-2025-22053, CVE-2025-22054, CVE-2025-22055, CVE-2025-22056, CVE-2025-22057, CVE-2025-22058, CVE-2025-22060, CVE-2025-22062, CVE-2025-22063, CVE-2025-22064, CVE-2025-22065, CVE-2025-22066, CVE-2025-22068, CVE-2025-22070, CVE-2025-22071, CVE-2025-22072, CVE-2025-22073, CVE-2025-22075, CVE-2025-22079, CVE-2025-22080, CVE-2025-22081, CVE-2025-22083, CVE-2025-22086, CVE-2025-22089, CVE-2025-22090, CVE-2025-22095, CVE-2025-22097, CVE-2025-23136, CVE-2025-23138, CVE-2025-37838, CVE-2025-37937, CVE-2025-37958, CVE-2025-38118, CVE-2025-38152, CVE-2025-38227, CVE-2025-38240, CVE-2025-38352, CVE-2025-38575, CVE-2025-38616, CVE-2025-38637, CVE-2025-38666, CVE-2025-38678, CVE-2025-39682, CVE-2025-39728, CVE-2025-39735, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018, CVE-2025-40114, CVE-2025-40157) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS linux-image-6.8.0-1044-azure-fips 6.8.0-1044.50+fips1 Available with Ubuntu Pro linux-image-azure-fips 6.8.0-1044.50+fips1 Available with Ubuntu Pro linux-image-azure-fips-6.8 6.8.0-1044.50+fips1 Available with Ubuntu Pro After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, whichrequires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://ubuntu.com/security/notices/USN-7940-1 CVE-2023-53034, CVE-2024-58092, CVE-2025-21729, CVE-2025-22018, CVE-2025-22019, CVE-2025-22020, CVE-2025-22021, CVE-2025-22025, CVE-2025-22027, CVE-2025-22028, CVE-2025-22033, CVE-2025-22035, CVE-2025-22036, CVE-2025-22038, CVE-2025-22039, CVE-2025-22040, CVE-2025-22041, CVE-2025-22042, CVE-2025-22044, CVE-2025-22045, CVE-2025-22047, CVE-2025-22050, CVE-2025-22053, CVE-2025-22054, CVE-2025-22055, CVE-2025-22056, CVE-2025-22057, CVE-2025-22058, CVE-2025-22060, CVE-2025-22062, CVE-2025-22063, CVE-2025-22064, CVE-2025-22065, CVE-2025-22066, CVE-2025-22068, CVE-2025-22070, CVE-2025-22071, CVE-2025-22072, CVE-2025-22073, CVE-2025-22075, CVE-2025-22079, CVE-2025-22080, CVE-2025-22081, CVE-2025-22083, CVE-2025-22086, CVE-2025-22089, CVE-2025-22090, CVE-2025-22095, CVE-2025-22097, CVE-2025-23136, CVE-2025-23138, CVE-2025-37838, CVE-2025-37937, CVE-2025-37958, CVE-2025-38118, CVE-2025-38152, CVE-2025-38227, CVE-2025-38240, CVE-2025-38352, CVE-2025-38575, CVE-2025-38616, CVE-2025-38637, CVE-2025-38666, CVE-2025-38678, CVE-2025-39682, CVE-2025-39728, CVE-2025-39735, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018, CVE-2025-40114, CVE-2025-40157, CVE-2025-40300 Package Information: . Several issues fixed in Linux kernel Azure FIPS for Ubuntu 24.04, includes critical risks and exposure potential.. linux kernel, ubuntu security, azure fips, system update, information exposure. . Severity: Critical. LinuxSecurity.com Team

Calendar 2 Dec 17, 2025 •Critical Ubuntu
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Ubuntu 20.04: Linux Kernel Critical Info Disclosure CVE-2025-40300

Several security issues were fixed in the Linux kernel.. ========================================================================== Ubuntu Security Notice USN-7938-1 December 16, 2025 linux-azure-5.15 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-azure-5.15: Linux kernel for Microsoft Azure cloud systems Details: Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux kernel contained insufficient branch predictor isolation between a guest and a userspace hypervisor for certain processors. This flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this to expose sensitive information from the host OS. (CVE-2025-40300) 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; - PowerPC architecture; - RISC-V architecture; - S390 architecture; - x86 architecture; - Block layer subsystem; - Cryptographic API; - ACPI drivers; - ATM drivers; - DRBD Distributed Replicated Block Device drivers; - Bus devices; - Clock framework and drivers; - Data acquisition framework and drivers; - Hardware crypto device drivers; - Device frequency scaling framework; - Buffer Sharing and Synchronization framework; - DMA engine subsystem; - ARM SCMI message protocol; - GPU drivers; - HID subsystem; - Hardware monitoring drivers; - I2C subsystem; - I3C subsystem; - IIO subsystem; - InfiniBand drivers; - Input Device core drivers; - IOMMU subsystem; - Media drivers; - Network drivers; - Mellanox network drivers; - PCI subsystem; - PCCARD (PCMCIA/CardBus) bussubsystem; - PHY drivers; - Power supply drivers; - Voltage and Current Regulator drivers; - SCSI subsystem; - ASPEED SoC drivers; - QCOM SoC drivers; - small TFT LCD display modules; - Trusted Execution Environment drivers; - TTY drivers; - UFS subsystem; - USB core drivers; - DesignWare USB3 driver; - USB Gadget drivers; - Framebuffer layer; - AFS file system; - BTRFS file system; - File systems infrastructure; - EFI Variable file system; - Ext4 file system; - F2FS file system; - JFS file system; - Network file system (NFS) client; - Network file system (NFS) server daemon; - NILFS2 file system; - NTFS3 file system; - SMB network file system; - Asynchronous Transfer Mode (ATM) subsystem; - BPF subsystem; - NFS page cache wrapper; - Memory management; - Networking subsytem; - UDP network protocol; - Perf events; - RCU subsystem; - Tracing infrastructure; - 802.1Q VLAN protocol; - Appletalk network protocol; - Amateur Radio drivers; - B.A.T.M.A.N. meshing protocol; - Bluetooth subsystem; - Ethernet bridge; - Networking core; - HSR network protocol; - IPv4 networking; - IPv6 networking; - Multipath TCP; - Netfilter; - Network traffic control; - SCTP protocol; - TLS protocol; - Wireless networking; - SoC audio core drivers; - USB sound devices; (CVE-2022-49390, CVE-2022-50070, CVE-2022-50327, CVE-2023-52935, CVE-2023-53074, CVE-2024-47691, CVE-2024-50061, CVE-2024-50067, CVE-2024-53068, CVE-2024-53090, CVE-2024-53218, CVE-2025-21855, CVE-2025-37925, CVE-2025-37968, CVE-2025-38095, CVE-2025-38148, CVE-2025-38165, CVE-2025-38335, CVE-2025-38347, CVE-2025-38468, CVE-2025-38470, CVE-2025-38473, CVE-2025-38474, CVE-2025-38476, CVE-2025-38478, CVE-2025-38480, CVE-2025-38481, CVE-2025-38482, CVE-2025-38483, CVE-2025-38487, CVE-2025-38488, CVE-2025-38494, CVE-2025-38495, CVE-2025-38497, CVE-2025-38499, CVE-2025-38502, CVE-2025-38527, CVE-2025-38528, CVE-2025-38529,CVE-2025-38530, CVE-2025-38535, CVE-2025-38538, CVE-2025-38539, CVE-2025-38548, CVE-2025-38550, CVE-2025-38553, CVE-2025-38555, CVE-2025-38563, CVE-2025-38565, CVE-2025-38569, CVE-2025-38572, CVE-2025-38574, CVE-2025-38576, CVE-2025-38577, CVE-2025-38578, CVE-2025-38579, CVE-2025-38581, CVE-2025-38583, CVE-2025-38601, CVE-2025-38602, CVE-2025-38604, CVE-2025-38608, CVE-2025-38609, CVE-2025-38612, CVE-2025-38614, CVE-2025-38622, CVE-2025-38623, CVE-2025-38624, CVE-2025-38630, CVE-2025-38634, CVE-2025-38635, CVE-2025-38639, CVE-2025-38645, CVE-2025-38650, CVE-2025-38652, CVE-2025-38663, CVE-2025-38664, CVE-2025-38666, CVE-2025-38668, CVE-2025-38670, CVE-2025-38671, CVE-2025-38676, CVE-2025-38677, CVE-2025-38678, CVE-2025-38680, CVE-2025-38681, CVE-2025-38684, CVE-2025-38685, CVE-2025-38687, CVE-2025-38691, CVE-2025-38693, CVE-2025-38694, CVE-2025-38695, CVE-2025-38696, CVE-2025-38697, CVE-2025-38698, CVE-2025-38699, CVE-2025-38700, CVE-2025-38701, CVE-2025-38706, CVE-2025-38707, CVE-2025-38708, CVE-2025-38711, CVE-2025-38712, CVE-2025-38713, CVE-2025-38714, CVE-2025-38715, CVE-2025-38718, CVE-2025-38721, CVE-2025-38724, CVE-2025-38725, CVE-2025-38729, CVE-2025-38732, CVE-2025-39673, CVE-2025-39675, CVE-2025-39676, CVE-2025-39681, CVE-2025-39683, CVE-2025-39684, CVE-2025-39685, CVE-2025-39686, CVE-2025-39687, CVE-2025-39689, CVE-2025-39691, CVE-2025-39693, CVE-2025-39697, CVE-2025-39702, CVE-2025-39703, CVE-2025-39709, CVE-2025-39710, CVE-2025-39713, CVE-2025-39714, CVE-2025-39724, CVE-2025-39730, CVE-2025-39734, CVE-2025-39736, CVE-2025-39737, CVE-2025-39738, CVE-2025-39742, CVE-2025-39743, CVE-2025-39749, CVE-2025-39752, CVE-2025-39756, CVE-2025-39757, CVE-2025-39760, CVE-2025-39766, CVE-2025-39772, CVE-2025-39773, CVE-2025-39776, CVE-2025-39782, CVE-2025-39783, CVE-2025-39787, CVE-2025-39788, CVE-2025-39790, CVE-2025-39794, CVE-2025-39795, CVE-2025-39798, CVE-2025-39801, CVE-2025-39806, CVE-2025-39808, CVE-2025-39812, CVE-2025-39813, CVE-2025-39817, CVE-2025-39823, CVE-2025-39824, CVE-2025-39828, CVE-2025-39835,CVE-2025-39839, CVE-2025-39841, CVE-2025-39844, CVE-2025-39845, CVE-2025-39846, CVE-2025-39847, CVE-2025-39848, CVE-2025-39853, CVE-2025-39860, CVE-2025-39864, CVE-2025-39865, CVE-2025-39866, CVE-2025-39891, CVE-2025-39894, CVE-2025-39902, CVE-2025-39920, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS linux-image-5.15.0-1102-azure 5.15.0-1102.111~20.04.1 Available with Ubuntu Pro linux-image-azure 5.15.0.1102.111~20.04.1 Available with Ubuntu Pro linux-image-azure-5.15 5.15.0.1102.111~20.04.1 Available with Ubuntu Pro linux-image-azure-cvm 5.15.0.1102.111~20.04.1 Available with Ubuntu Pro After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://ubuntu.com/security/notices/USN-7938-1 CVE-2022-49390, CVE-2022-50070, CVE-2022-50327, CVE-2023-52935, CVE-2023-53074, CVE-2024-47691, CVE-2024-50061, CVE-2024-50067, CVE-2024-53068, CVE-2024-53090, CVE-2024-53218, CVE-2025-21855, CVE-2025-37925, CVE-2025-37968, CVE-2025-38095, CVE-2025-38148, CVE-2025-38165, CVE-2025-38335, CVE-2025-38347, CVE-2025-38468, CVE-2025-38470, CVE-2025-38473, CVE-2025-38474, CVE-2025-38476, CVE-2025-38478, CVE-2025-38480, CVE-2025-38481, CVE-2025-38482, CVE-2025-38483, CVE-2025-38487, CVE-2025-38488, CVE-2025-38494, CVE-2025-38495,CVE-2025-38497, CVE-2025-38499, CVE-2025-38502, CVE-2025-38527, CVE-2025-38528, CVE-2025-38529, CVE-2025-38530, CVE-2025-38535, CVE-2025-38538, CVE-2025-38539, CVE-2025-38548, CVE-2025-38550, CVE-2025-38553, CVE-2025-38555, CVE-2025-38563, CVE-2025-38565, CVE-2025-38569, CVE-2025-38572, CVE-2025-38574, CVE-2025-38576, CVE-2025-38577, CVE-2025-38578, CVE-2025-38579, CVE-2025-38581, CVE-2025-38583, CVE-2025-38601, CVE-2025-38602, CVE-2025-38604, CVE-2025-38608, CVE-2025-38609, CVE-2025-38612, CVE-2025-38614, CVE-2025-38622, CVE-2025-38623, CVE-2025-38624, CVE-2025-38630, CVE-2025-38634, CVE-2025-38635, CVE-2025-38639, CVE-2025-38645, CVE-2025-38650, CVE-2025-38652, CVE-2025-38663, CVE-2025-38664, CVE-2025-38666, CVE-2025-38668, CVE-2025-38670, CVE-2025-38671, CVE-2025-38676, CVE-2025-38677, CVE-2025-38678, CVE-2025-38680, CVE-2025-38681, CVE-2025-38684, CVE-2025-38685, CVE-2025-38687, CVE-2025-38691, CVE-2025-38693, CVE-2025-38694, CVE-2025-38695, CVE-2025-38696, CVE-2025-38697, CVE-2025-38698, CVE-2025-38699, CVE-2025-38700, CVE-2025-38701, CVE-2025-38706, CVE-2025-38707, CVE-2025-38708, CVE-2025-38711, CVE-2025-38712, CVE-2025-38713, CVE-2025-38714, CVE-2025-38715, CVE-2025-38718, CVE-2025-38721, CVE-2025-38724, CVE-2025-38725, CVE-2025-38729, CVE-2025-38732, CVE-2025-39673, CVE-2025-39675, CVE-2025-39676, CVE-2025-39681, CVE-2025-39683, CVE-2025-39684, CVE-2025-39685, CVE-2025-39686, CVE-2025-39687, CVE-2025-39689, CVE-2025-39691, CVE-2025-39693, CVE-2025-39697, CVE-2025-39702, CVE-2025-39703, CVE-2025-39709, CVE-2025-39710, CVE-2025-39713, CVE-2025-39714, CVE-2025-39724, CVE-2025-39730, CVE-2025-39734, CVE-2025-39736, CVE-2025-39737, CVE-2025-39738, CVE-2025-39742, CVE-2025-39743, CVE-2025-39749, CVE-2025-39752, CVE-2025-39756, CVE-2025-39757, CVE-2025-39760, CVE-2025-39766, CVE-2025-39772, CVE-2025-39773, CVE-2025-39776, CVE-2025-39782, CVE-2025-39783, CVE-2025-39787, CVE-2025-39788, CVE-2025-39790, CVE-2025-39794,CVE-2025-39795, CVE-2025-39798, CVE-2025-39801, CVE-2025-39806, CVE-2025-39808, CVE-2025-39812, CVE-2025-39813, CVE-2025-39817, CVE-2025-39823, CVE-2025-39824, CVE-2025-39828, CVE-2025-39835, CVE-2025-39839, CVE-2025-39841, CVE-2025-39844, CVE-2025-39845, CVE-2025-39846, CVE-2025-39847, CVE-2025-39848, CVE-2025-39853, CVE-2025-39860, CVE-2025-39864, CVE-2025-39865, CVE-2025-39866, CVE-2025-39891, CVE-2025-39894, CVE-2025-39902, CVE-2025-39920, CVE-2025-39964, CVE-2025-39993, CVE-2025-40018, CVE-2025-40300 . Several security issues in Linux kernel for Ubuntu 20.04 LTS. Essential update to mitigate risks of data exposure and attacks.. Linux kernel update, Ubuntu security, Azure vulnerabilities, Guest VM risks. . Severity: Critical. LinuxSecurity.com Team

Calendar 2 Dec 16, 2025 •Critical Ubuntu
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Ubuntu 22.04: USN-7862-2 Linux Kernel Info Exposure CVE-2025-40300

The system could be made to expose sensitive information.. ========================================================================== Ubuntu Security Notice USN-7862-2 November 10, 2025 linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx, linux-raspi vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: The system could be made to expose sensitive information. Software Description: - linux-nvidia-tegra: Linux kernel for NVIDIA Tegra systems - linux-nvidia-tegra-igx: Linux kernel for NVIDIA Tegra IGX systems - linux-raspi: Linux kernel for Raspberry Pi systems - linux-nvidia-tegra-5.15: Linux kernel for NVIDIA Tegra systems Details: Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux kernel contained insufficient branch predictor isolation between a guest and a userspace hypervisor for certain processors. This flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this to expose sensitive information from the host OS. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS linux-image-5.15.0-1037-nvidia-tegra-igx 5.15.0-1037.37 linux-image-5.15.0-1037-nvidia-tegra-igx-rt 5.15.0-1037.37 linux-image-5.15.0-1048-nvidia-tegra 5.15.0-1048.48 linux-image-5.15.0-1048-nvidia-tegra-rt 5.15.0-1048.48 linux-image-5.15.0-1090-raspi 5.15.0-1090.93 linux-image-nvidia-tegra 5.15.0.1048.48 linux-image-nvidia-tegra-5.15 5.15.0.1048.48 linux-image-nvidia-tegra-igx 5.15.0.1037.39 linux-image-nvidia-tegra-igx-5.15 5.15.0.1037.39 linux-image-nvidia-tegra-igx-rt 5.15.0.1037.39 linux-image-nvidia-tegra-igx-rt-5.15 5.15.0.1037.39 linux-image-nvidia-tegra-rt 5.15.0.1048.48 linux-image-nvidia-tegra-rt-5.15 5.15.0.1048.48 linux-image-raspi 5.15.0.1090.88 linux-image-raspi-5.15 5.15.0.1090.88 linux-image-raspi-nolpae 5.15.0.1090.88 Ubuntu 20.04 LTS linux-image-5.15.0-1048-nvidia-tegra 5.15.0-1048.48~20.04.1 Available with Ubuntu Pro linux-image-5.15.0-1048-nvidia-tegra-rt 5.15.0-1048.48~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra 5.15.0.1048.48~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra-5.15 5.15.0.1048.48~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra-rt 5.15.0.1048.48~20.04.1 Available with Ubuntu Pro linux-image-nvidia-tegra-rt-5.15 5.15.0.1048.48~20.04.1 Available with Ubuntu Pro After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://ubuntu.com/security/notices/USN-7862-2 https://ubuntu.com/security/notices/USN-7862-1 CVE-2025-40300 Package Information: . A security advisory on Ubuntu's Linux kernel exposing sensitive info via branch predictor isolation issues.. Linux Kernel Update, Ubuntu Security, Information Exposure Risk. . Severity: Critical. LinuxSecurity.com Team

Calendar 2 Nov 10, 2025 •Critical Ubuntu
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