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[USN-7767-1] Linux kernel (Real-time) vulnerabilities

Posted on 24 September 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7767-1
September 24, 2025

linux-realtime 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-realtime: Linux kernel for Real-time systems

Details:

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;
- x86 architecture;
- Compute Acceleration Framework;
- Bus devices;
- AMD CDX bus driver;
- DPLL subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- I2C subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Network drivers;
- Mellanox network drivers;
- NVME drivers;
- Pin controllers subsystem;
- RapidIO drivers;
- Voltage and Current Regulator drivers;
- SCSI subsystem;
- SLIMbus drivers;
- QCOM SoC drivers;
- UFS subsystem;
- USB DSL drivers;
- Renesas USBHS Controller drivers;
- USB Type-C Connector System Software Interface driver;
- Framebuffer layer;
- ACRN Hypervisor Service Module driver;
- Network file system (NFS) client;
- Proc file system;
- SMB network file system;
- Memory Management;
- Scheduler infrastructure;
- SoC audio core drivers;
- Perf events;
- Tracing infrastructure;
- Memory management;
- 802.1Q VLAN protocol;
- Asynchronous Transfer Mode (ATM) subsystem;
- Bluetooth subsystem;
- Devlink API;
- IPv4 networking;
- IPv6 networking;
- Logical Link layer;
- Management Component Transport Protocol (MCTP);
- Multipath TCP;
- Netfilter;
- Network traffic control;
- Switch device API;
- Wireless networking;
- eXpress Data Path;
(CVE-2025-21966, CVE-2025-21895, CVE-2025-21944, CVE-2025-21986,
CVE-2025-21918, CVE-2025-21873, CVE-2025-21963, CVE-2025-21929,
CVE-2025-21995, CVE-2025-22017, CVE-2025-21991, CVE-2025-21960,
CVE-2025-21946, CVE-2025-21976, CVE-2025-21922, CVE-2025-21925,
CVE-2025-21903, CVE-2025-21978, CVE-2025-21979, CVE-2025-22016,
CVE-2025-21936, CVE-2025-21997, CVE-2025-21992, CVE-2025-21920,
CVE-2025-21875, CVE-2025-21934, CVE-2025-21919, CVE-2025-21972,
CVE-2025-22001, CVE-2025-21981, CVE-2025-21910, CVE-2025-21969,
CVE-2025-22010, CVE-2025-21908, CVE-2025-21957, CVE-2025-22009,
CVE-2025-21927, CVE-2025-21930, CVE-2025-21994, CVE-2025-21980,
CVE-2025-21885, CVE-2025-21967, CVE-2025-21899, CVE-2025-21890,
CVE-2025-21948, CVE-2025-21964, CVE-2025-21911, CVE-2025-21982,
CVE-2025-21883, CVE-2025-21913, CVE-2025-21917, CVE-2025-21905,
CVE-2025-21968, CVE-2025-22013, CVE-2025-22005, CVE-2025-21916,
CVE-2025-21880, CVE-2025-21881, CVE-2025-22003, CVE-2025-21892,
CVE-2025-21937, CVE-2025-21970, CVE-2025-22004, CVE-2025-21950,
CVE-2025-21924, CVE-2025-21894, CVE-2025-21904, CVE-2025-21915,
CVE-2025-21889, CVE-2025-21912, CVE-2025-21909, CVE-2025-21888,
CVE-2025-21935, CVE-2025-22008, CVE-2025-37889, CVE-2025-21878,
CVE-2025-21926, CVE-2025-22011, CVE-2025-21962, CVE-2025-22007,
CVE-2025-21941, CVE-2025-21898, CVE-2025-21956, CVE-2025-22015,
CVE-2025-21961, CVE-2025-21872, CVE-2025-21891, CVE-2025-21947,
CVE-2025-21955, CVE-2025-21877, CVE-2025-21996, CVE-2025-21977,
CVE-2025-21945, CVE-2025-21914, CVE-2025-21975, CVE-2024-58090,
CVE-2025-21959, CVE-2025-22014, CVE-2025-21951, CVE-2025-21928,
CVE-2025-21999)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
linux-image-6.8.1-1034-realtime 6.8.1-1034.35
Available with Ubuntu Pro
linux-image-realtime 6.8.1-1034.35
Available with Ubuntu Pro
linux-image-realtime-6.8.1 6.8.1-1034.35
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-7767-1
CVE-2024-58090, CVE-2025-21872, CVE-2025-21873, CVE-2025-21875,
CVE-2025-21877, CVE-2025-21878, CVE-2025-21880, CVE-2025-21881,
CVE-2025-21883, CVE-2025-21885, CVE-2025-21888, CVE-2025-21889,
CVE-2025-21890, CVE-2025-21891, CVE-2025-21892, CVE-2025-21894,
CVE-2025-21895, CVE-2025-21898, CVE-2025-21899, CVE-2025-21903,
CVE-2025-21904, CVE-2025-21905, CVE-2025-21908, CVE-2025-21909,
CVE-2025-21910, CVE-2025-21911, CVE-2025-21912, CVE-2025-21913,
CVE-2025-21914, CVE-2025-21915, CVE-2025-21916, CVE-2025-21917,
CVE-2025-21918, CVE-2025-21919, CVE-2025-21920, CVE-2025-21922,
CVE-2025-21924, CVE-2025-21925, CVE-2025-21926, CVE-2025-21927,
CVE-2025-21928, CVE-2025-21929, CVE-2025-21930, CVE-2025-21934,
CVE-2025-21935, CVE-2025-21936, CVE-2025-21937, CVE-2025-21941,
CVE-2025-21944, CVE-2025-21945, CVE-2025-21946, CVE-2025-21947,
CVE-2025-21948, CVE-2025-21950, CVE-2025-21951, CVE-2025-21955,
CVE-2025-21956, CVE-2025-21957, CVE-2025-21959, CVE-2025-21960,
CVE-2025-21961, CVE-2025-21962, CVE-2025-21963, CVE-2025-21964,
CVE-2025-21966, CVE-2025-21967, CVE-2025-21968, CVE-2025-21969,
CVE-2025-21970, CVE-2025-21972, CVE-2025-21975, CVE-2025-21976,
CVE-2025-21977, CVE-2025-21978, CVE-2025-21979, CVE-2025-21980,
CVE-2025-21981, CVE-2025-21982, CVE-2025-21986, CVE-2025-21991,
CVE-2025-21992, CVE-2025-21994, CVE-2025-21995, CVE-2025-21996,
CVE-2025-21997, CVE-2025-21999, CVE-2025-22001, CVE-2025-22003,
CVE-2025-22004, CVE-2025-22005, CVE-2025-22007, CVE-2025-22008,
CVE-2025-22009, CVE-2025-22010, CVE-2025-22011, CVE-2025-22013,
CVE-2025-22014, CVE-2025-22015, CVE-2025-22016, CVE-2025-22017,
CVE-2025-37889

Package Information:
https://launchpad.net/ubuntu/+source/linux-realtime/6.8.1-1034.35


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