==========================================================================
Ubuntu Security Notice USN-8393-1
June 04, 2026

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:

It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)

It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)

It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a container. (CVE-2026-43503,
CVE-2026-46300)

Qualys discovered that a race condition existed in the ptrace subsystem of
the Linux kernel when privileged processes are exiting. An unprivileged
local attacker could use this issue to expose sensitive information.
(CVE-2026-46333)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contain a memory leak when handling AppArmor notifications. A local
attacker could use this to cause resource exhaustion. (CVE-2026-47326)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contain a NULL pointer dereference when handling AppArmor notifications. A
local attacker could use this to cause a kernel oops. (CVE-2026-47327)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained an invalid free when handling AppArmor notifications. A local
attacker could use this to corrupt kernel memory. (CVE-2026-47328)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained insufficient validation of AppArmor notification responses. A
local attacker could use this to allow crafted responses to be processed.
(CVE-2026-47329)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0 used
an uninitialized variable when handling AppArmor notifications. A local
attacker could use this to cause incorrect caching of data.
(CVE-2026-47330)

Tristan Madani discovered that Ubuntu Linux kernel 6.8 contained a use-
after-free (UAF) bug. A local attacker could use this to cause memory
corruption and, theoretically, arbitrary code execution. (CVE-2026-47331)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained an out-of-bounds (OOB) read when handling AppArmor notifications.
A local attacker could use this to cause information disclosure of kernel
memory. (CVE-2026-47332)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained a out-of-bounds (OOB) read when handling AppArmor notifications.
A local attacker could use this to cause kernel memory corruption and,
theoretically, influence processing of AppArmor policies. (CVE-2026-47333)

Tristan Madani discovered that Ubuntu Linux kernel 6.8, 6.17 and 7.0
contained incorrect holding of locks when handling AppArmor notifications.
A local attacker could use this to cause a kernel panic or deadlock.
(CVE-2026-47334)

Tristan Madani discovered that Ubuntu Linux kernel 6.8 contained a NULL
pointer dereference when handling AppArmor notifications. A local attacker
could use this to cause a kernel panic. (CVE-2026-47335)

Tristan Madani discovered that Ubuntu Linux kernel 6.8 used an
uninitialized variable when handling AppArmor AF_INET/AF_INET6 socket
mediation. A local attacker could use this to influence processing of fine-
grained network socket mediation. (CVE-2026-47336)

Tristan Madani and Trevor Lawrence have each independently discovered that
Ubuntu Linux kernel 6.8, 6.17 and 7.0 contained a NULL pointer dereference
when handling AppArmor network socket mediation. A local attacker could use
this to cause a kernel oops. (CVE-2026-47337)

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;
   - x86 architecture;
   - Cryptographic API;
   - Compute Acceleration Framework;
   - Drivers core;
   - Null block device driver;
   - Ublk userspace block driver;
   - Bluetooth drivers;
   - Counter interface drivers;
   - DMA engine subsystem;
   - DPLL subsystem;
   - GPU drivers;
   - HID subsystem;
   - Intel Trace Hub HW tracing drivers;
   - IIO ADC drivers;
   - IIO subsystem;
   - On-Chip Interconnect management framework;
   - IRQ chip drivers;
   - Modular ISDN driver;
   - LED subsystem;
   - Multiple devices driver;
   - UACCE accelerator framework;
   - MMC subsystem;
   - Ethernet bonding driver;
   - Network drivers;
   - Mellanox network drivers;
   - NVME drivers;
   - PHY drivers;
   - x86 platform drivers;
   - i.MX PM domains;
   - SCSI subsystem;
   - SLIMbus drivers;
   - SPI subsystem;
   - TCM subsystem;
   - W1 Dallas's 1-wire bus driver;
   - Xen hypervisor drivers;
   - BTRFS file system;
   - EFI Variable file system;
   - exFAT file system;
   - Ext4 file system;
   - HFS+ file system;
   - Network file system (NFS) client;
   - Network file system (NFS) server daemon;
   - NTFS3 file system;
   - SMB network file system;
   - Scheduler infrastructure;
   - Netfilter;
   - NFC subsystem;
   - Tracing infrastructure;
   - io_uring subsystem;
   - BPF subsystem;
   - Perf events;
   - Floating proportions library;
   - Memory management;
   - Bluetooth subsystem;
   - CAN network layer;
   - Ceph Core library;
   - Networking core;
   - IPv4 networking;
   - IPv6 networking;
   - L2TP protocol;
   - MAC80211 subsystem;
   - NET/ROM layer;
   - Packet sockets;
   - RDS protocol;
   - RxRPC session sockets;
   - Network traffic control;
   - SCTP protocol;
   - TLS protocol;
   - Unix domain sockets;
   - VMware vSockets driver;
   - Wireless networking;
   - ALSA AC97 driver;
   - Generic PCM loopback sound driver;
   - Creative Sound Blaster X-Fi driver;
   - AMD SoC Alsa drivers;
   - Texas InstrumentS Audio (ASoC/HDA) drivers;
   - USB sound devices;
   - KVM subsystem;
(CVE-2024-50004, CVE-2024-58096, CVE-2024-58097, CVE-2025-37926,
CVE-2025-38201, CVE-2025-38591, CVE-2025-40039, CVE-2025-40082,
CVE-2025-40149, CVE-2025-68351, CVE-2025-68358, CVE-2025-68365,
CVE-2025-68725, CVE-2025-68749, CVE-2025-68803, CVE-2025-68823,
CVE-2025-71160, CVE-2025-71162, CVE-2025-71163, CVE-2025-71180,
CVE-2025-71182, CVE-2025-71183, CVE-2025-71184, CVE-2025-71185,
CVE-2025-71186, CVE-2025-71188, CVE-2025-71189, CVE-2025-71190,
CVE-2025-71191, CVE-2025-71192, CVE-2025-71193, CVE-2025-71194,
CVE-2025-71195, CVE-2025-71196, CVE-2025-71197, CVE-2025-71198,
CVE-2025-71199, CVE-2025-71200, CVE-2025-71220, CVE-2025-71222,
CVE-2025-71224, CVE-2025-71225, CVE-2025-71268, CVE-2026-22976,
CVE-2026-22977, CVE-2026-22978, CVE-2026-22979, CVE-2026-22980,
CVE-2026-22982, CVE-2026-22984, CVE-2026-22990, CVE-2026-22991,
CVE-2026-22992, CVE-2026-22994, CVE-2026-22996, CVE-2026-22997,
CVE-2026-22998, CVE-2026-22999, CVE-2026-23000, CVE-2026-23001,
CVE-2026-23003, CVE-2026-23005, CVE-2026-23006, CVE-2026-23010,
CVE-2026-23011, CVE-2026-23019, CVE-2026-23020, CVE-2026-23021,
CVE-2026-23025, CVE-2026-23026, CVE-2026-23030, CVE-2026-23031,
CVE-2026-23032, CVE-2026-23033, CVE-2026-23035, CVE-2026-23037,
CVE-2026-23038, CVE-2026-23047, CVE-2026-23049, CVE-2026-23050,
CVE-2026-23053, CVE-2026-23054, CVE-2026-23056, CVE-2026-23057,
CVE-2026-23058, CVE-2026-23059, CVE-2026-23061, CVE-2026-23062,
CVE-2026-23063, CVE-2026-23064, CVE-2026-23065, CVE-2026-23068,
CVE-2026-23069, CVE-2026-23071, CVE-2026-23073, CVE-2026-23075,
CVE-2026-23076, CVE-2026-23078, CVE-2026-23080, CVE-2026-23083,
CVE-2026-23084, CVE-2026-23085, CVE-2026-23086, CVE-2026-23087,
CVE-2026-23088, CVE-2026-23089, CVE-2026-23090, CVE-2026-23091,
CVE-2026-23093, CVE-2026-23094, CVE-2026-23095, CVE-2026-23096,
CVE-2026-23097, CVE-2026-23098, CVE-2026-23099, CVE-2026-23101,
CVE-2026-23102, CVE-2026-23103, CVE-2026-23105, CVE-2026-23107,
CVE-2026-23108, CVE-2026-23110, CVE-2026-23113, CVE-2026-23116,
CVE-2026-23119, CVE-2026-23120, CVE-2026-23121, CVE-2026-23123,
CVE-2026-23124, CVE-2026-23125, CVE-2026-23126, CVE-2026-23128,
CVE-2026-23129, CVE-2026-23131, CVE-2026-23133, CVE-2026-23135,
CVE-2026-23136, CVE-2026-23139, CVE-2026-23140, CVE-2026-23141,
CVE-2026-23142, CVE-2026-23144, CVE-2026-23145, CVE-2026-23146,
CVE-2026-23148, CVE-2026-23150, CVE-2026-23151, CVE-2026-23156,
CVE-2026-23159, CVE-2026-23160, CVE-2026-23163, CVE-2026-23164,
CVE-2026-23166, CVE-2026-23167, CVE-2026-23168, CVE-2026-23170,
CVE-2026-23172, CVE-2026-23173, CVE-2026-23176, CVE-2026-23178,
CVE-2026-23179, CVE-2026-23180, CVE-2026-23182, CVE-2026-23187,
CVE-2026-23190, CVE-2026-23191, CVE-2026-23193, CVE-2026-23198,
CVE-2026-23200, CVE-2026-23202, CVE-2026-23204, CVE-2026-23205,
CVE-2026-23206, CVE-2026-23212, CVE-2026-23213, CVE-2026-23214,
CVE-2026-23215, CVE-2026-23216, CVE-2026-23254, CVE-2026-23256,
CVE-2026-23257, CVE-2026-23258, CVE-2026-23260, CVE-2026-23261,
CVE-2026-23262, CVE-2026-23264, CVE-2026-23274, CVE-2026-23351,
CVE-2026-23394, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533,
CVE-2026-31676, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078,
CVE-2026-43494, CVE-2026-46028)

Update instructions:

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

Ubuntu 24.04 LTS
   linux-image-6.8.0-1059-azure-fips  6.8.0-1059.65+fips1
                                   Available with Ubuntu Pro
   linux-image-azure-fips          6.8.0-1059.65+fips1
                                   Available with Ubuntu Pro
   linux-image-azure-fips-6.8      6.8.0-1059.65+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, 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-8393-1
   CVE-2024-50004, CVE-2024-58096, CVE-2024-58097, CVE-2025-37926,
   CVE-2025-38201, CVE-2025-38591, CVE-2025-40039, CVE-2025-40082,
   CVE-2025-40149, CVE-2025-68351, CVE-2025-68358, CVE-2025-68365,
   CVE-2025-68725, CVE-2025-68749, CVE-2025-68803, CVE-2025-68823,
   CVE-2025-71160, CVE-2025-71162, CVE-2025-71163, CVE-2025-71180,
   CVE-2025-71182, CVE-2025-71183, CVE-2025-71184, CVE-2025-71185,
   CVE-2025-71186, CVE-2025-71188, CVE-2025-71189, CVE-2025-71190,
   CVE-2025-71191, CVE-2025-71192, CVE-2025-71193, CVE-2025-71194,
   CVE-2025-71195, CVE-2025-71196, CVE-2025-71197, CVE-2025-71198,
   CVE-2025-71199, CVE-2025-71200, CVE-2025-71220, CVE-2025-71222,
   CVE-2025-71224, CVE-2025-71225, CVE-2025-71268, CVE-2026-22976,
   CVE-2026-22977, CVE-2026-22978, CVE-2026-22979, CVE-2026-22980,
   CVE-2026-22982, CVE-2026-22984, CVE-2026-22990, CVE-2026-22991,
   CVE-2026-22992, CVE-2026-22994, CVE-2026-22996, CVE-2026-22997,
   CVE-2026-22998, CVE-2026-22999, CVE-2026-23000, CVE-2026-23001,
   CVE-2026-23003, CVE-2026-23005, CVE-2026-23006, CVE-2026-23010,
   CVE-2026-23011, CVE-2026-23019, CVE-2026-23020, CVE-2026-23021,
   CVE-2026-23025, CVE-2026-23026, CVE-2026-23030, CVE-2026-23031,
   CVE-2026-23032, CVE-2026-23033, CVE-2026-23035, CVE-2026-23037,
   CVE-2026-23038, CVE-2026-23047, CVE-2026-23049, CVE-2026-23050,
   CVE-2026-23053, CVE-2026-23054, CVE-2026-23056, CVE-2026-23057,
   CVE-2026-23058, CVE-2026-23059, CVE-2026-23061, CVE-2026-23062,
   CVE-2026-23063, CVE-2026-23064, CVE-2026-23065, CVE-2026-23068,
   CVE-2026-23069, CVE-2026-23071, CVE-2026-23073, CVE-2026-23075,
   CVE-2026-23076, CVE-2026-23078, CVE-2026-23080, CVE-2026-23083,
   CVE-2026-23084, CVE-2026-23085, CVE-2026-23086, CVE-2026-23087,
   CVE-2026-23088, CVE-2026-23089, CVE-2026-23090, CVE-2026-23091,
   CVE-2026-23093, CVE-2026-23094, CVE-2026-23095, CVE-2026-23096,
   CVE-2026-23097, CVE-2026-23098, CVE-2026-23099, CVE-2026-23101,
   CVE-2026-23102, CVE-2026-23103, CVE-2026-23105, CVE-2026-23107,
   CVE-2026-23108, CVE-2026-23110, CVE-2026-23113, CVE-2026-23116,
   CVE-2026-23119, CVE-2026-23120, CVE-2026-23121, CVE-2026-23123,
   CVE-2026-23124, CVE-2026-23125, CVE-2026-23126, CVE-2026-23128,
   CVE-2026-23129, CVE-2026-23131, CVE-2026-23133, CVE-2026-23135,
   CVE-2026-23136, CVE-2026-23139, CVE-2026-23140, CVE-2026-23141,
   CVE-2026-23142, CVE-2026-23144, CVE-2026-23145, CVE-2026-23146,
   CVE-2026-23148, CVE-2026-23150, CVE-2026-23151, CVE-2026-23156,
   CVE-2026-23159, CVE-2026-23160, CVE-2026-23163, CVE-2026-23164,
   CVE-2026-23166, CVE-2026-23167, CVE-2026-23168, CVE-2026-23170,
   CVE-2026-23172, CVE-2026-23173, CVE-2026-23176, CVE-2026-23178,
   CVE-2026-23179, CVE-2026-23180, CVE-2026-23182, CVE-2026-23187,
   CVE-2026-23190, CVE-2026-23191, CVE-2026-23193, CVE-2026-23198,
   CVE-2026-23200, CVE-2026-23202, CVE-2026-23204, CVE-2026-23205,
   CVE-2026-23206, CVE-2026-23212, CVE-2026-23213, CVE-2026-23214,
   CVE-2026-23215, CVE-2026-23216, CVE-2026-23254, CVE-2026-23256,
   CVE-2026-23257, CVE-2026-23258, CVE-2026-23260, CVE-2026-23261,
   CVE-2026-23262, CVE-2026-23264, CVE-2026-23274, CVE-2026-23351,
   CVE-2026-23394, CVE-2026-31419, CVE-2026-31431, CVE-2026-31504,
   CVE-2026-31533, CVE-2026-31676, CVE-2026-43033, CVE-2026-43077,
   CVE-2026-43078, CVE-2026-43284, CVE-2026-43494, CVE-2026-43500,
   CVE-2026-43503, CVE-2026-45998, CVE-2026-46000, CVE-2026-46028,
   CVE-2026-46300, CVE-2026-46333, CVE-2026-47326, CVE-2026-47327,
   CVE-2026-47328, CVE-2026-47329, CVE-2026-47330, CVE-2026-47331,
   CVE-2026-47332, CVE-2026-47333, CVE-2026-47334, CVE-2026-47335,
   CVE-2026-47336, CVE-2026-47337

Package Information:
   https://launchpad.net/ubuntu/+source/linux-azure-fips/6.8.0-1059.65+fips1