Important: kernel

Issue Overview:

2023-06-29: CVE-2023-33203 was added to this advisory.

2023-06-07: CVE-2023-1838 was added to this advisory.

2023-05-11: CVE-2023-2019 was added to this advisory.

2023-08-03: CVE-2023-2194 was added to this advisory.

The Linux kernel before 6.2.9 has a race condition and resultant use-after-free in drivers/net/ethernet/qualcomm/emac/emac.c if a physically proximate attacker unplugs an emac based device. (CVE-2023-33203)

A use-after-free flaw was found in vhost_net_set_backend in drivers/vhost/net.c in virtio network subcomponent in the Linux kernel due to a double fget. This flaw could allow a local attacker to crash the system, and could even lead to a kernel information leak problem. (CVE-2023-1838)

An insufficient permission check has been found in the Bluetooth subsystem of the Linux kernel when handling ioctl system calls of HCI sockets. This causes tasks without the proper CAP_NET_ADMIN capability can easily mark HCI sockets as trusted. Trusted sockets are of management commands and events, such as pairing or connecting with a new device. As a result, unprivileged users can acquire a trusted socket, leading to unauthorized execution of management commands. The exploit requires only the presence of a set of commonly used setuid programs (e.g., su, sudo). (CVE-2023-2019)

An out-of-bounds memory access flaw was found in the Linux kernel’'s XFS file system in how a user restores an XFS image after failure (with a dirty log journal). This flaw allows a local user to crash or potentially escalate their privileges on the system. (CVE-2023-2124)

An out-of-bounds write vulnerability was found in the Linux kernel’s SLIMpro I2C device driver. The userspace ‘data->block[0]’ variable was not capped to a number between 0-255 and was used as the size of a memcpy, possibly writing beyond the end of dma_buffer. This flaw could allow a local privileged user to crash the system or potentially achieve code execution. (CVE-2023-2194)

cbq_classify in net/sched/sch_cbq.c in the Linux kernel through 6.1.4 allows attackers to cause a denial of service (slab-out-of-bounds read) because of type confusion (non-negative numbers can sometimes indicate a TC_ACT_SHOT condition rather than valid classification results). (CVE-2023-23454)

Affected Packages:

kernel

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update kernel to update your system.

New Packages:

aarch64:  
    kernel-4.14.313-235.533.amzn2.aarch64  
    kernel-headers-4.14.313-235.533.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.313-235.533.amzn2.aarch64  
    perf-4.14.313-235.533.amzn2.aarch64  
    perf-debuginfo-4.14.313-235.533.amzn2.aarch64  
    python-perf-4.14.313-235.533.amzn2.aarch64  
    python-perf-debuginfo-4.14.313-235.533.amzn2.aarch64  
    kernel-tools-4.14.313-235.533.amzn2.aarch64  
    kernel-tools-devel-4.14.313-235.533.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.313-235.533.amzn2.aarch64  
    kernel-devel-4.14.313-235.533.amzn2.aarch64  
    kernel-debuginfo-4.14.313-235.533.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.313-235.533.amzn2.i686  
  
src:  
    kernel-4.14.313-235.533.amzn2.src  
  
x86_64:  
    kernel-4.14.313-235.533.amzn2.x86_64  
    kernel-headers-4.14.313-235.533.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.313-235.533.amzn2.x86_64  
    perf-4.14.313-235.533.amzn2.x86_64  
    perf-debuginfo-4.14.313-235.533.amzn2.x86_64  
    python-perf-4.14.313-235.533.amzn2.x86_64  
    python-perf-debuginfo-4.14.313-235.533.amzn2.x86_64  
    kernel-tools-4.14.313-235.533.amzn2.x86_64  
    kernel-tools-devel-4.14.313-235.533.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.313-235.533.amzn2.x86_64  
    kernel-devel-4.14.313-235.533.amzn2.x86_64  
    kernel-debuginfo-4.14.313-235.533.amzn2.x86_64  
    kernel-livepatch-4.14.313-235.533-1.0-0.amzn2.x86_64  

Additional References

Red Hat: CVE-2023-1838, CVE-2023-2002, CVE-2023-2124, CVE-2023-2194, CVE-2023-23454, CVE-2023-33203

Mitre: CVE-2023-1838, CVE-2023-2002, CVE-2023-2124, CVE-2023-2194, CVE-2023-23454, CVE-2023-33203