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Red Hat Security Advisory 2023-1556-01

Red Hat Security Advisory 2023-1556-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include a use-after-free vulnerability.

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====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2023:1556-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:1556
Issue date: 2023-04-04
CVE Names: CVE-2023-0266 CVE-2023-0461
====================================================================

  1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4
Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

  1. Relevant releases/architectures:

Red Hat Enterprise Linux Real Time EUS (v.8.4) - x86_64
Red Hat Enterprise Linux Real Time for NFV EUS (v.8.4) - x86_64

  1. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

  • ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF
    (CVE-2023-0266)

  • kernel: net/ulp: use-after-free in listening ULP sockets (CVE-2023-0461)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Bug Fix(es):

  • kernel-rt RHEL-8.4: disable KASAN, KCSAN and UBSAN for kernel-rt
    (BZ#2165124)

  • kernel-rt: update RT source tree to the RHEL-8.4.z16 source tree (async)
    (BZ#2183403)

  1. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

  1. Bugs fixed (https://bugzilla.redhat.com/):

2163379 - CVE-2023-0266 ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF
2176192 - CVE-2023-0461 kernel: net/ulp: use-after-free in listening ULP sockets

  1. Package List:

Red Hat Enterprise Linux Real Time for NFV EUS (v.8.4):

Source:
kernel-rt-4.18.0-305.86.2.rt7.160.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm

Red Hat Enterprise Linux Real Time EUS (v.8.4):

Source:
kernel-rt-4.18.0-305.86.2.rt7.160.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.86.2.rt7.160.el8_4.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

  1. References:

https://access.redhat.com/security/cve/CVE-2023-0266
https://access.redhat.com/security/cve/CVE-2023-0461
https://access.redhat.com/security/updates/classification/#important

  1. Contact:

The Red Hat security contact is [email protected]. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2023 Red Hat, Inc.
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Ubuntu Security Notice 5939-1 - It was discovered that the Upper Level Protocol subsystem in the Linux kernel did not properly handle sockets entering the LISTEN state in certain protocols, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the NVMe driver in the Linux kernel did not properly handle reset events in some situations. A local attacker could use this to cause a denial of service.

Ubuntu Security Notice USN-5939-1

Ubuntu Security Notice 5939-1 - It was discovered that the Upper Level Protocol subsystem in the Linux kernel did not properly handle sockets entering the LISTEN state in certain protocols, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the NVMe driver in the Linux kernel did not properly handle reset events in some situations. A local attacker could use this to cause a denial of service.

Ubuntu Security Notice USN-5935-1

Ubuntu Security Notice 5935-1 - It was discovered that the Upper Level Protocol subsystem in the Linux kernel did not properly handle sockets entering the LISTEN state in certain protocols, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Davide Ornaghi discovered that the netfilter subsystem in the Linux kernel did not properly handle VLAN headers in some situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

Ubuntu Security Notice USN-5929-1

Ubuntu Security Notice 5929-1 - It was discovered that the Upper Level Protocol subsystem in the Linux kernel did not properly handle sockets entering the LISTEN state in certain protocols, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Davide Ornaghi discovered that the netfilter subsystem in the Linux kernel did not properly handle VLAN headers in some situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

Ubuntu Security Notice USN-5913-1

Ubuntu Security Notice 5913-1 - It was discovered that the Upper Level Protocol subsystem in the Linux kernel did not properly handle sockets entering the LISTEN state in certain protocols, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Lee Jones discovered that a use-after-free vulnerability existed in the Bluetooth implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

Ubuntu Security Notice USN-5914-1

Ubuntu Security Notice 5914-1 - It was discovered that the Upper Level Protocol subsystem in the Linux kernel did not properly handle sockets entering the LISTEN state in certain protocols, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the NFSD implementation in the Linux kernel did not properly handle some RPC messages, leading to a buffer overflow. A remote attacker could use this to cause a denial of service or possibly execute arbitrary code.

CVE-2023-0461

There is a use-after-free vulnerability in the Linux Kernel which can be exploited to achieve local privilege escalation. To reach the vulnerability kernel configuration flag CONFIG_TLS or CONFIG_XFRM_ESPINTCP has to be configured, but the operation does not require any privilege. There is a use-after-free bug of icsk_ulp_data of a struct inet_connection_sock. When CONFIG_TLS is enabled, user can install a tls context (struct tls_context) on a connected tcp socket. The context is not cleared if this socket is disconnected and reused as a listener. If a new socket is created from the listener, the context is inherited and vulnerable. The setsockopt TCP_ULP operation does not require any privilege. We recommend upgrading past commit 2c02d41d71f90a5168391b6a5f2954112ba2307c

CVE-2023-0266: ALSA: control: code refactoring for ELEM_READ/ELEM_WRITE operations · torvalds/linux@becf9e5

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e

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