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Ubuntu 26.04 Kernel Moderate Privilege Escalation Vuln USN-8566-1

ubuntu
Calendar Grey July 20, 2026
Scroller Ubuntu
Significant security updates for the Ubuntu kernel address multiple threats, including privilege escalation risks.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gke: Linux kernel for Google Container Engine (GKE) systems

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

Details:

It was discovered that some AMD Zen 2 processors did not properly isolate

shared resources in the operation cache. A local attacker could possibly

use this issue to corrupt instructions executed at a higher privilege

level, resulting in privilege escalation. (CVE-2025-54518)

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:

- PSP security protocol;

- ARM64 architecture;

- PowerPC architecture;

- RISC-V architecture;

- S390 architecture;

- User-Mode Linux (UML);

- x86 architecture;

- Block layer subsystem;

- Cryptographic API;

- Intel NPU Dr...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory privilege escalation Ubuntu vulnerability kernel local attack

Update Instructions

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

Ubuntu 26.04 LTS
  linux-image-7.0.0-1003-gke      7.0.0-1003.4
  linux-image-7.0.0-1003-gke-64k  7.0.0-1003.4
  linux-image-7.0.0-1008-gcp      7.0.0-1008.8
  linux-image-7.0.0-1008-gcp-64k  7.0.0-1008.8
  linux-image-7.0.0-28-generic    7.0.0-28.28
  linux-image-7.0.0-28-generic-64k  7.0.0-28.28
  linux-image-7.0.0-28-realtime   7.0.0-28.28.1
  linux-image-7.0.0-28-realtime-64k  7.0.0-28.28.1
  linux-image-gcp                 7.0.0-1008.8
  linux-image-gcp-64k             7.0.0-1008.8
  linux-image-gcp-64k-7.0         7.0.0-1008.8
  linux-image-gcp-7.0             7.0.0-1008.8
  linux-image-generic             7.0.0-28.28
  linux-image-generic-64k         7.0.0-28.28
  linux-image-generic-64k-7.0     7.0.0-28.28
  linux-image-generic-64k-hwe-26.04  7.0.0-28.28
  linux-image-generic-7.0         7.0.0-28.28
  linux-image-generic-hwe-26.04   7.0.0-28.28
  linux-image-gke                 7.0.0-1003.4
  linux-image-gke-64k             7.0.0-1003.4
  linux-image-gke-64k-7.0         7.0.0-1003.4
  linux-image-gke-64k-hwe-26.04   7.0.0-1003.4
  linux-image-gke-7.0             7.0.0-1003.4
  linux-image-gke-hwe-26.04       7.0.0-1003.4
  linux-image-oem-24.04           7.0.0-28.28
  linux-image-oem-24.04a          7.0.0-28.28
  linux-image-oem-24.04b          7.0.0-28.28
  linux-image-oem-24.04c          7.0.0-28.28
  linux-image-oem-24.04d          7.0.0-28.28
  linux-image-realtime            7.0.0-28.28.1
  linux-image-realtime-64k        7.0.0-28.28.1
  linux-image-realtime-64k-7.0    7.0.0-28.28.1
  linux-image-realtime-64k-hwe-26.04  7.0.0-28.28.1
  linux-image-realtime-7.0        7.0.0-28.28.1
  linux-image-realtime-hwe-26.04  7.0.0-28.28.1
  linux-image-virtual             7.0.0-28.28
  linux-image-virtual-7.0         7.0.0-28.28
  linux-image-virtual-hwe-26.04   7.0.0-28.28

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-8566-1

CVE-2025-54518, CVE-2026-43490, CVE-2026-43492, CVE-2026-43495,

CVE-2026-43496, CVE-2026-43497, CVE-2026-43498, CVE-2026-43502,

CVE-2026-45834, CVE-2026-45835, CVE-2026-45836, CVE-2026-45837,

CVE-2026-45838, CVE-2026-45839, CVE-2026-45840, CVE-2026-45841,

CVE-2026-45842, CVE-2026-45843, CVE-2026-45844, CVE-2026-45845,

CVE-2026-45846, CVE-2026-46104, CVE-2026-46105, CVE-2026-46106,

CVE-2026-46107, CVE-2026-46108, CVE-2026-46109, CVE-2026-46110,

CVE-2026-46111, CVE-2026-46112, CVE-2026-46113, CVE-2026-46114,

CVE-2026-46116, CVE-2026-46117, CVE-2026-46118, CVE-2026-46120,

CVE-2026-46121, CVE-2026-46122, CVE-2026-46123, CVE-2026-46124,

CVE-2026-46125, CVE-2026-46126, CVE-2026-46127, CVE-2026-46128,

CVE-2026-46129, CVE-2026-46130, CVE-2026-46131, CVE-2026-46132,

CVE-2026-46133, CVE-2026-46134, CVE-2026-46136, CVE-2026-46138,

CVE-2026-46139, CVE-2026-46140, CVE-2026-46141, CVE-2026-46142,

CVE-2026-46143, CVE-2026-46144, CVE-2026-46145, CVE-2026-46146,

CVE-2026-46147, CVE-2026-46148, CVE-2026-46149, CVE-2026-46150,

CVE-2026-46151, CVE-2026-46152, CVE-2026-46153, CVE-2026-46154,

CVE-2026-46156, CVE-2026-46157, CVE-2026-46158, CVE-2026-46159,

CVE-2026-46160, CVE-2026-46161, CVE-2026-46162, CVE-2026-46163,

CVE-2026-46164, CVE-2026-46165, CVE-2026-46166, CVE-2026-46167,

CVE-2026-46168, CVE-2026-46169, CVE-2026-46170, CVE-2026-46171,

CVE-2026-46172, CVE-2026-46173, CVE-2026-46174, CVE-2026-46175,

CVE-2026-46176, CVE-2026-46177, CVE-2026-46178, CVE-2026-46179,

CVE-2026-46180, CVE-2026-46181, CVE-2026-46182, CVE-2026-46183,

CVE-2026-46184, CVE-2026-46186, CVE-2026-46187, CVE-2026-46188,

CVE-2026-46189, CVE-2026-46190, CVE-2026-46191, CVE-2026-46192,

CVE-2026-46193, CVE-2026-46194, CVE-2026-46196, CVE-2026-46197,

CVE-2026-46198, CVE-2026-46199, CVE-2026-46200, CVE-2026-46201,

CVE-2026-46202, CVE-2026-46203, CVE-2026-46204, CVE-2026-46205,

CVE-2026-46206, CVE-2026-46207, CVE-2026-46208, CVE-2026-46209,

CVE-2026-46210, CVE-2026-46211, CVE-2026-46212, CVE-2026-46213,

CVE-2026-46214, CVE-2026-46215, CVE-2026-46216, CVE-2026-46218,

CVE-2026-46219, CVE-2026-46220, CVE-2026-46221, CVE-2026-46222,

CVE-2026-46223, CVE-2026-46224, CVE-2026-46225, CVE-2026-46226,

CVE-2026-46227, CVE-2026-46228, CVE-2026-46229, CVE-2026-46230,

CVE-2026-46231, CVE-2026-46232, CVE-2026-46233, CVE-2026-46234,

CVE-2026-46235, CVE-2026-46236, CVE-2026-46238, CVE-2026-46239,

CVE-2026-46240, CVE-2026-46241, CVE-2026-46242, CVE-2026-46273,

CVE-2026-46274, CVE-2026-46275, CVE-2026-46290, CVE-2026-46291,

CVE-2026-46292, CVE-2026-46293, CVE-2026-46294, CVE-2026-46295,

CVE-2026-46296, CVE-2026-46297, CVE-2026-46298, CVE-2026-46299,

CVE-2026-46301, CVE-2026-46302, CVE-2026-46303, CVE-2026-46304,

CVE-2026-46305, CVE-2026-46306, CVE-2026-46307, CVE-2026-46308,

CVE-2026-46309, CVE-2026-46310, CVE-2026-46311, CVE-2026-46312,

CVE-2026-46313, CVE-2026-46314, CVE-2026-46315, CVE-2026-46317,

CVE-2026-46318, CVE-2026-46319, CVE-2026-46320, CVE-2026-46321,

CVE-2026-46322, CVE-2026-46324, CVE-2026-52911, CVE-2026-52912,

CVE-2026-52913, CVE-2026-52914, CVE-2026-52915, CVE-2026-52916,

CVE-2026-52918, CVE-2026-52919, CVE-2026-52920, CVE-2026-52921,

CVE-2026-52922, CVE-2026-52923, CVE-2026-52925, CVE-2026-52926,

CVE-2026-52927, CVE-2026-52928, CVE-2026-52931, CVE-2026-52932,

CVE-2026-52934, CVE-2026-52936, CVE-2026-52937, CVE-2026-52941,

CVE-2026-52943, CVE-2026-52944, CVE-2026-52949, CVE-2026-52950,

CVE-2026-52951, CVE-2026-52952, CVE-2026-52953, CVE-2026-52954,

CVE-2026-52955, CVE-2026-52956, CVE-2026-52957, CVE-2026-52958,

CVE-2026-52959, CVE-2026-52960, CVE-2026-52961, CVE-2026-52962,

CVE-2026-52963, CVE-2026-52964, CVE-2026-52965, CVE-2026-52967,

CVE-2026-52968, CVE-2026-52969, CVE-2026-52970, CVE-2026-52971,

CVE-2026-52973, CVE-2026-52974, CVE-2026-52975, CVE-2026-52976,

CVE-2026-52977, CVE-2026-52978, CVE-2026-52979, CVE-2026-52980,

CVE-2026-52981, CVE-2026-52982, CVE-2026-52983, CVE-2026-52984,

CVE-2026-52985, CVE-2026-52986, CVE-2026-52987, CVE-2026-52988,

CVE-2026-52989, CVE-2026-52990, CVE-2026-52991, CVE-2026-52992,

CVE-2026-52993, CVE-2026-52994, CVE-2026-52995, CVE-2026-52996,

CVE-2026-52997, CVE-2026-52998, CVE-2026-52999, CVE-2026-53000,

CVE-2026-53001, CVE-2026-53002, CVE-2026-53003, CVE-2026-53004,

CVE-2026-53005, CVE-2026-53006, CVE-2026-53007, CVE-2026-53008,

CVE-2026-53009, CVE-2026-53010, CVE-2026-53011, CVE-2026-53012,

CVE-2026-53013, CVE-2026-53014, CVE-2026-53015, CVE-2026-53016,

CVE-2026-53017, CVE-2026-53018, CVE-2026-53019, CVE-2026-53020,

CVE-2026-53021, CVE-2026-53022, CVE-2026-53023, CVE-2026-53024,

CVE-2026-53025, CVE-2026-53026, CVE-2026-53027, CVE-2026-53028,

CVE-2026-53029, CVE-2026-53030, CVE-2026-53031, CVE-2026-53032,

CVE-2026-53033, CVE-2026-53034, CVE-2026-53035, CVE-2026-53036,

CVE-2026-53037, CVE-2026-53038, CVE-2026-53039, CVE-2026-53040,

CVE-2026-53041, CVE-2026-53042, CVE-2026-53043, CVE-2026-53044,

CVE-2026-53045, CVE-2026-53046, CVE-2026-53047, CVE-2026-53048,

CVE-2026-53049, CVE-2026-53050, CVE-2026-53051, CVE-2026-53052,

CVE-2026-53053, CVE-2026-53054, CVE-2026-53055, CVE-2026-53056,

CVE-2026-53057, CVE-2026-53058, CVE-2026-53059, CVE-2026-53060,

CVE-2026-53061, CVE-2026-53062, CVE-2026-53063, CVE-2026-53064,

CVE-2026-53065, CVE-2026-53066, CVE-2026-53067, CVE-2026-53068,

CVE-2026-53069, CVE-2026-53070, CVE-2026-53071, CVE-2026-53072,

CVE-2026-53073, CVE-2026-53074, CVE-2026-53075, CVE-2026-53076,

CVE-2026-53077, CVE-2026-53078, CVE-2026-53079, CVE-2026-53080,

CVE-2026-53081, CVE-2026-53082, CVE-2026-53083, CVE-2026-53084,

CVE-2026-53085, CVE-2026-53086, CVE-2026-53087, CVE-2026-53088,

CVE-2026-53089, CVE-2026-53090, CVE-2026-53091, CVE-2026-53092,

CVE-2026-53093, CVE-2026-53094, CVE-2026-53095, CVE-2026-53096,

CVE-2026-53097, CVE-2026-53098, CVE-2026-53099, CVE-2026-53100,

CVE-2026-53101, CVE-2026-53102, CVE-2026-53103, CVE-2026-53104,

CVE-2026-53105, CVE-2026-53106, CVE-2026-53107, CVE-2026-53108,

CVE-2026-53109, CVE-2026-53110, CVE-2026-53111, CVE-2026-53112,

CVE-2026-53113, CVE-2026-53114, CVE-2026-53115, CVE-2026-53116,

CVE-2026-53117, CVE-2026-53118, CVE-2026-53119, CVE-2026-53120,

CVE-2026-53121, CVE-2026-53122, CVE-2026-53123, CVE-2026-53124,

CVE-2026-53125, CVE-2026-53126, CVE-2026-53127, CVE-2026-53128,

CVE-2026-53129, CVE-2026-53130, CVE-2026-53174, CVE-2026-53277,

CVE-2026-53278, CVE-2026-53279, CVE-2026-53280, CVE-2026-53281,

CVE-2026-53282, CVE-2026-53283, CVE-2026-53284, CVE-2026-53285,

CVE-2026-53286, CVE-2026-53287, CVE-2026-53288, CVE-2026-53289,

CVE-2026-53290, CVE-2026-53291, CVE-2026-53292, CVE-2026-53293,

CVE-2026-53294, CVE-2026-53295, CVE-2026-53296, CVE-2026-53297,

CVE-2026-53298, CVE-2026-53299, CVE-2026-53300, CVE-2026-53301,

CVE-2026-53302, CVE-2026-53303, CVE-2026-53304, CVE-2026-53305,

CVE-2026-53306, CVE-2026-53307, CVE-2026-53308, CVE-2026-53309,

CVE-2026-53310, CVE-2026-53311, CVE-2026-53312, CVE-2026-53313,

CVE-2026-53314, CVE-2026-53315, CVE-2026-53316, CVE-2026-53317,

CVE-2026-53318, CVE-2026-53319, CVE-2026-53320, CVE-2026-53321,

CVE-2026-53322, CVE-2026-53323, CVE-2026-53324, CVE-2026-53357,

CVE-2026-53358, CVE-2026-53360, CVE-2026-53364, CVE-2026-53365

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8566-1

Topics%20covered

Topics Covered

security advisory privilege escalation Ubuntu vulnerability kernel local attack

Package Information

https://launchpad.net/ubuntu/+source/linux/7.0.0-28.28
https://launchpad.net/ubuntu/+source/linux-gcp/7.0.0-1008.8
https://launchpad.net/ubuntu/+source/linux-gke/7.0.0-1003.4
https://launchpad.net/ubuntu/+source/linux-realtime/7.0.0-28.28.1

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