In the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.

The remote Ubuntu 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7100-2 advisory.

    Supraja Sridhara, Benedict Schlter, Mark Kuhne, Andrin Bertschi, and Shweta Shinde discovered that the     Confidential Computing framework in the Linux kernel for x86 platforms did not properly handle 32-bit     emulation on TDX and SEV. An attacker with access to the VMM could use this to cause a denial of service     (guest crash) or possibly execute arbitrary code. (CVE-2024-25744)

    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;

    - MIPS architecture;

    - PowerPC architecture;

    - RISC-V architecture;

    - User-Mode Linux (UML);

    - x86 architecture;

    - Block layer subsystem;

    - Android drivers;

    - Serial ATA and Parallel ATA drivers;

    - ATM drivers;

    - Drivers core;

    - Null block device driver;

    - Character device driver;

    - ARM SCMI message protocol;

    - GPU drivers;

    - HID subsystem;

    - Hardware monitoring drivers;

    - I3C subsystem;

    - InfiniBand drivers;

    - Input Device core drivers;

    - Input Device (Miscellaneous) drivers;

    - IOMMU subsystem;

    - IRQ chip drivers;

    - ISDN/mISDN subsystem;

    - LED subsystem;

    - Multiple devices driver;

    - Media drivers;

    - VMware VMCI Driver;

    - MMC subsystem;

    - Network drivers;

    - Near Field Communication (NFC) drivers;

    - NVME drivers;

    - Device tree and open firmware driver;

    - Parport drivers;

    - PCI subsystem;

    - Pin controllers subsystem;

    - Remote Processor subsystem;

    - S/390 drivers;

    - SCSI drivers;

    - QCOM SoC drivers;

    - Direct Digital Synthesis drivers;

    - Thunderbolt and USB4 drivers;

    - TTY drivers;

    - Userspace I/O drivers;

    - DesignWare USB3 driver;

    - USB Gadget drivers;

    - USB Host Controller drivers;

    - USB Type-C Connector System Software Interface driver;

    - USB over IP driver;

    - VHOST drivers;

    - File systems infrastructure;

    - BTRFS file system;

    - Ext4 file system;

    - F2FS file system;

    - JFS file system;

    - NILFS2 file system;

    - NTFS3 file system;

    - Proc file system;

    - SMB network file system;

    - Core kernel;

    - DMA mapping infrastructure;

    - RCU subsystem;

    - Tracing infrastructure;

    - Radix Tree data structure library;

    - Kernel userspace event delivery library;

    - Objagg library;

    - Memory management;

    - Amateur Radio drivers;

    - Bluetooth subsystem;

    - Ethernet bridge;

    - CAN network layer;

    - Networking core;

    - Ethtool driver;

    - IPv4 networking;

    - IPv6 networking;

    - IUCV driver;

    - KCM (Kernel Connection Multiplexor) sockets driver;

    - MAC80211 subsystem;

    - Multipath TCP;

    - Netfilter;

    - Network traffic control;

    - SCTP protocol;

    - Sun RPC protocol;

    - TIPC protocol;

    - TLS protocol;

    - Wireless networking;

    - AppArmor security module;

    - Landlock security;

    - Simplified Mandatory Access Control Kernel framework;

    - FireWire sound drivers;

    - SoC audio core drivers;

    - USB sound devices; (CVE-2024-42288, CVE-2024-41098, CVE-2024-43849, CVE-2024-46689, CVE-2024-44987,     CVE-2024-40915, CVE-2024-46844, CVE-2024-45009, CVE-2024-46780, CVE-2024-41081, CVE-2024-43817,     CVE-2024-44965, CVE-2024-46832, CVE-2024-41072, CVE-2024-45011, CVE-2024-46814, CVE-2024-45026,     CVE-2024-44982, CVE-2024-46723, CVE-2024-46771, CVE-2024-46759, CVE-2024-41063, CVE-2024-46673,     CVE-2023-52889, CVE-2024-41020, CVE-2024-46677, CVE-2024-46798, CVE-2024-45021, CVE-2024-46676,     CVE-2024-47668, CVE-2024-42289, CVE-2024-45018, CVE-2024-46724, CVE-2024-41090, CVE-2024-43853,     CVE-2024-42272, CVE-2024-43828, CVE-2024-42292, CVE-2024-26800, CVE-2024-43871, CVE-2024-46758,     CVE-2024-36484, CVE-2024-46755, CVE-2024-46782, CVE-2024-43889, CVE-2024-46763, CVE-2024-41015,     CVE-2024-43858, CVE-2024-41012, CVE-2024-44960, CVE-2024-46747, CVE-2024-42311, CVE-2024-47660,     CVE-2024-42267, CVE-2024-44998, CVE-2024-43839, CVE-2024-43914, CVE-2024-46783, CVE-2024-47659,     CVE-2024-46725, CVE-2024-46840, CVE-2024-43873, CVE-2024-46737, CVE-2024-44946, CVE-2024-43841,     CVE-2024-26669, CVE-2024-42306, CVE-2024-26661, CVE-2024-42259, CVE-2024-41011, CVE-2024-46822,     CVE-2024-42287, CVE-2024-46746, CVE-2024-43860, CVE-2024-42246, CVE-2024-46800, CVE-2024-45007,     CVE-2024-42296, CVE-2024-47669, CVE-2024-44983, CVE-2024-43880, CVE-2024-42284, CVE-2022-48666,     CVE-2024-44990, CVE-2024-43894, CVE-2024-44989, CVE-2023-52918, CVE-2024-42295, CVE-2024-43869,     CVE-2024-42277, CVE-2024-46818, CVE-2024-42270, CVE-2024-45025, CVE-2024-42301, CVE-2024-43883,     CVE-2024-46714, CVE-2024-46815, CVE-2024-41073, CVE-2024-43905, CVE-2024-43882, CVE-2024-46719,     CVE-2024-42286, CVE-2024-44952, CVE-2024-42297, CVE-2024-41022, CVE-2024-46743, CVE-2024-43829,     CVE-2024-43909, CVE-2024-42265, CVE-2024-44944, CVE-2024-46807, CVE-2024-46739, CVE-2024-43867,     CVE-2024-44958, CVE-2024-44969, CVE-2024-42271, CVE-2024-46745, CVE-2024-42299, CVE-2024-45006,     CVE-2024-43908, CVE-2024-44966, CVE-2024-41065, CVE-2024-46777, CVE-2024-42309, CVE-2024-38602,     CVE-2024-44947, CVE-2024-43884, CVE-2024-43902, CVE-2024-47667, CVE-2024-46750, CVE-2024-41070,     CVE-2024-26893, CVE-2024-41017, CVE-2024-46810, CVE-2024-46828, CVE-2024-43893, CVE-2024-41077,     CVE-2024-46756, CVE-2024-46740, CVE-2024-42269, CVE-2024-43890, CVE-2024-45008, CVE-2024-46795,     CVE-2024-43854, CVE-2024-46713, CVE-2024-47663, CVE-2024-46702, CVE-2024-46781, CVE-2024-46722,     CVE-2024-42114, CVE-2024-44948, CVE-2024-44988, CVE-2024-42302, CVE-2024-41019, CVE-2024-46731,     CVE-2024-46819, CVE-2024-44995, CVE-2024-41059, CVE-2024-43856, CVE-2024-44954, CVE-2024-43863,     CVE-2024-38577, CVE-2024-43870, CVE-2024-41068, CVE-2024-41071, CVE-2024-38611, CVE-2024-46761,     CVE-2024-42304, CVE-2024-42310, CVE-2024-46707, CVE-2024-42290, CVE-2024-42276, CVE-2024-44935,     CVE-2024-46721, CVE-2024-46817, CVE-2024-46791, CVE-2024-44934, CVE-2024-45028, CVE-2024-46757,     CVE-2024-43879, CVE-2024-43907, CVE-2024-43846, CVE-2024-42280, CVE-2024-44999, CVE-2024-43861,     CVE-2024-42126, CVE-2024-26607, CVE-2024-46752, CVE-2024-42305, CVE-2024-43835, CVE-2024-41042,     CVE-2024-46675, CVE-2024-46804, CVE-2024-41091, CVE-2024-41060, CVE-2024-46744, CVE-2024-47665,     CVE-2024-39472, CVE-2024-46829, CVE-2024-42285, CVE-2024-42281, CVE-2024-43830, CVE-2024-42274,     CVE-2024-46679, CVE-2024-44985, CVE-2024-46805, CVE-2024-42312, CVE-2024-42283, CVE-2024-45003,     CVE-2024-44971, CVE-2024-42313, CVE-2024-46685, CVE-2024-46738, CVE-2024-44986, CVE-2024-43834,     CVE-2024-46732, CVE-2024-43875, CVE-2024-42318, CVE-2024-41064, CVE-2024-44974, CVE-2024-43892,     CVE-2024-41078)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS / 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7100-1 advisory.

    Supraja Sridhara, Benedict Schlter, Mark Kuhne, Andrin Bertschi, and Shweta Shinde discovered that the     Confidential Computing framework in the Linux kernel for x86 platforms did not properly handle 32-bit     emulation on TDX and SEV. An attacker with access to the VMM could use this to cause a denial of service     (guest crash) or possibly execute arbitrary code. (CVE-2024-25744)

    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;

    - MIPS architecture;

    - PowerPC architecture;

    - RISC-V architecture;

    - User-Mode Linux (UML);

    - x86 architecture;

    - Block layer subsystem;

    - Android drivers;

    - Serial ATA and Parallel ATA drivers;

    - ATM drivers;

    - Drivers core;

    - Null block device driver;

    - Character device driver;

    - ARM SCMI message protocol;

    - GPU drivers;

    - HID subsystem;

    - Hardware monitoring drivers;

    - I3C subsystem;

    - InfiniBand drivers;

    - Input Device core drivers;

    - Input Device (Miscellaneous) drivers;

    - IOMMU subsystem;

    - IRQ chip drivers;

    - ISDN/mISDN subsystem;

    - LED subsystem;

    - Multiple devices driver;

    - Media drivers;

    - VMware VMCI Driver;

    - MMC subsystem;

    - Network drivers;

    - Near Field Communication (NFC) drivers;

    - NVME drivers;

    - Device tree and open firmware driver;

    - Parport drivers;

    - PCI subsystem;

    - Pin controllers subsystem;

    - Remote Processor subsystem;

    - S/390 drivers;

    - SCSI drivers;

    - QCOM SoC drivers;

    - Direct Digital Synthesis drivers;

    - Thunderbolt and USB4 drivers;

    - TTY drivers;

    - Userspace I/O drivers;

    - DesignWare USB3 driver;

    - USB Gadget drivers;

    - USB Host Controller drivers;

    - USB Type-C Connector System Software Interface driver;

    - USB over IP driver;

    - VHOST drivers;

    - File systems infrastructure;

    - BTRFS file system;

    - Ext4 file system;

    - F2FS file system;

    - JFS file system;

    - NILFS2 file system;

    - NTFS3 file system;

    - Proc file system;

    - SMB network file system;

    - Core kernel;

    - DMA mapping infrastructure;

    - RCU subsystem;

    - Tracing infrastructure;

    - Radix Tree data structure library;

    - Kernel userspace event delivery library;

    - Objagg library;

    - Memory management;

    - Amateur Radio drivers;

    - Bluetooth subsystem;

    - Ethernet bridge;

    - CAN network layer;

    - Networking core;

    - Ethtool driver;

    - IPv4 networking;

    - IPv6 networking;

    - IUCV driver;

    - KCM (Kernel Connection Multiplexor) sockets driver;

    - MAC80211 subsystem;

    - Multipath TCP;

    - Netfilter;

    - Network traffic control;

    - SCTP protocol;

    - Sun RPC protocol;

    - TIPC protocol;

    - TLS protocol;

    - Wireless networking;

    - AppArmor security module;

    - Landlock security;

    - Simplified Mandatory Access Control Kernel framework;

    - FireWire sound drivers;

    - SoC audio core drivers;

    - USB sound devices; (CVE-2024-43817, CVE-2024-42304, CVE-2024-46756, CVE-2024-42318, CVE-2024-41090,     CVE-2024-41063, CVE-2024-44987, CVE-2024-46844, CVE-2024-46677, CVE-2024-44988, CVE-2024-42297,     CVE-2024-26893, CVE-2024-46673, CVE-2024-26800, CVE-2024-42305, CVE-2024-46731, CVE-2024-41091,     CVE-2024-46810, CVE-2024-41072, CVE-2022-48666, CVE-2024-38602, CVE-2024-46780, CVE-2024-46750,     CVE-2024-43858, CVE-2024-41020, CVE-2024-46755, CVE-2024-46829, CVE-2024-41068, CVE-2024-45003,     CVE-2024-42280, CVE-2024-42283, CVE-2024-43873, CVE-2024-46746, CVE-2024-44969, CVE-2024-46807,     CVE-2024-41081, CVE-2024-44971, CVE-2024-26607, CVE-2024-43880, CVE-2024-42281, CVE-2024-42274,     CVE-2024-43908, CVE-2024-42267, CVE-2024-47665, CVE-2024-45011, CVE-2024-46707, CVE-2024-42310,     CVE-2024-42309, CVE-2024-44965, CVE-2024-46747, CVE-2024-42259, CVE-2024-46804, CVE-2024-46679,     CVE-2024-45007, CVE-2024-45009, CVE-2024-46771, CVE-2024-46739, CVE-2024-41060, CVE-2024-46676,     CVE-2024-46822, CVE-2024-42272, CVE-2024-41059, CVE-2024-43839, CVE-2024-46817, CVE-2024-47669,     CVE-2024-44999, CVE-2024-42285, CVE-2024-44986, CVE-2024-43828, CVE-2024-43879, CVE-2024-44998,     CVE-2024-46724, CVE-2024-41015, CVE-2024-45025, CVE-2024-43849, CVE-2024-46818, CVE-2024-43830,     CVE-2024-46725, CVE-2024-43834, CVE-2024-42302, CVE-2024-36484, CVE-2024-43853, CVE-2024-46782,     CVE-2024-46740, CVE-2024-46732, CVE-2024-43869, CVE-2024-42312, CVE-2024-42292, CVE-2024-43884,     CVE-2024-44934, CVE-2024-44995, CVE-2024-43894, CVE-2024-46675, CVE-2024-43870, CVE-2024-44990,     CVE-2024-42287, CVE-2024-41065, CVE-2024-42301, CVE-2024-42290, CVE-2024-46702, CVE-2024-46719,     CVE-2024-46745, CVE-2024-46758, CVE-2024-46757, CVE-2024-44935, CVE-2024-42276, CVE-2024-43890,     CVE-2023-52918, CVE-2024-41077, CVE-2024-43905, CVE-2024-38611, CVE-2024-42269, CVE-2024-42284,     CVE-2024-41073, CVE-2024-46722, CVE-2024-41017, CVE-2024-47667, CVE-2024-45021, CVE-2024-43867,     CVE-2024-41098, CVE-2024-43909, CVE-2024-46723, CVE-2024-45026, CVE-2024-42114, CVE-2024-44944,     CVE-2024-43835, CVE-2024-44982, CVE-2024-43907, CVE-2024-46828, CVE-2024-43856, CVE-2024-46832,     CVE-2024-44954, CVE-2024-43846, CVE-2024-41070, CVE-2024-43892, CVE-2024-44985, CVE-2024-42306,     CVE-2024-43889, CVE-2024-44958, CVE-2024-46798, CVE-2024-44989, CVE-2024-42313, CVE-2024-46737,     CVE-2024-42289, CVE-2024-43829, CVE-2024-46744, CVE-2023-52889, CVE-2024-46689, CVE-2024-47663,     CVE-2024-46791, CVE-2024-43863, CVE-2024-43893, CVE-2024-43841, CVE-2024-46777, CVE-2024-46800,     CVE-2024-45028, CVE-2024-44952, CVE-2024-43883, CVE-2024-44946, CVE-2024-43882, CVE-2024-44960,     CVE-2024-38577, CVE-2024-46814, CVE-2024-42288, CVE-2024-44947, CVE-2024-41071, CVE-2024-41042,     CVE-2024-41064, CVE-2024-42311, CVE-2024-42270, CVE-2024-43861, CVE-2024-46752, CVE-2024-42296,     CVE-2024-41022, CVE-2024-42246, CVE-2024-43871, CVE-2024-42265, CVE-2024-43854, CVE-2024-41019,     CVE-2024-46815, CVE-2024-46743, CVE-2024-42126, CVE-2024-26661, CVE-2024-41012, CVE-2024-46761,     CVE-2024-45008, CVE-2024-46805, CVE-2024-45006, CVE-2024-42295, CVE-2024-46783, CVE-2024-42286,     CVE-2024-46714, CVE-2024-42299, CVE-2024-46781, CVE-2024-43914, CVE-2024-44966, CVE-2024-44974,     CVE-2024-45018, CVE-2024-46840, CVE-2024-46819, CVE-2024-40915, CVE-2024-46759, CVE-2024-43860,     CVE-2024-47668, CVE-2024-39472, CVE-2024-47660, CVE-2024-47659, CVE-2024-46795, CVE-2024-43875,     CVE-2024-46738, CVE-2024-42271, CVE-2024-26669, CVE-2024-44983, CVE-2024-41078, CVE-2024-46685,     CVE-2024-46713, CVE-2024-46721, CVE-2024-46763, CVE-2024-41011, CVE-2024-43902, CVE-2024-42277,     CVE-2024-44948)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
210775	Ubuntu 22.04 LTS : Linux kernel vulnerabilities (USN-7100-2)	Nessus	Ubuntu Local Security Checks	high
210741	Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-7100-1)	Nessus	Ubuntu Local Security Checks	high

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CVE-2024-47660

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