Important: kernel

Issue Overview:

2024-02-01: CVE-2024-0639 was added to this advisory.

2023-09-27: CVE-2023-34319 was added to this advisory.

2023-09-27: CVE-2023-4128 was added to this advisory.

2023-09-27: CVE-2023-4208 was added to this advisory.

2023-09-27: CVE-2023-4206 was added to this advisory.

A use-after-free vulnerability was found in the Linux kernel’s netfilter subsystem in net/netfilter/nf_tables_api.c.

Mishandled error handling with NFT_MSG_NEWRULE makes it possible to use a dangling pointer in the same transaction causing a use-after-free vulnerability. This flaw allows a local attacker with user access to cause a privilege escalation issue.

We recommend upgrading past commit 1240eb93f0616b21c675416516ff3d74798fdc97. (CVE-2023-3390)

A buffer overrun vulnerability was found in the netback driver in Xen due to an unusual split packet. This flaw allows an unprivileged guest to cause a denial of service (DoS) of the host by sending network packets to the backend, causing the backend to crash. (CVE-2023-34319)

A use-after-free flaw was found in net/sched/cls_fw.c in classifiers (cls_fw, cls_u32, and cls_route) in the Linux Kernel. This flaw allows a local attacker to perform a local privilege escalation due to incorrect handling of the existing filter, leading to a kernel information leak issue. (CVE-2023-4128)

A use-after-free vulnerability in the Linux kernel’s net/sched: cls_route component can be exploited to achieve local privilege escalation.

When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8. (CVE-2023-4206)

A use-after-free vulnerability in the Linux kernel’s net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81. (CVE-2023-4208)

A denial of service vulnerability due to a deadlock was found in sctp_auto_asconf_init in net/sctp/socket.c in the Linux kernel’s SCTP subsystem. This flaw allows guests with local user privileges to trigger a deadlock and potentially crash the system. (CVE-2024-0639)

Affected Packages:

kernel

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

New Packages:

i686:  
    perf-debuginfo-4.14.322-170.535.amzn1.i686  
    kernel-devel-4.14.322-170.535.amzn1.i686  
    kernel-tools-debuginfo-4.14.322-170.535.amzn1.i686  
    kernel-debuginfo-4.14.322-170.535.amzn1.i686  
    kernel-tools-devel-4.14.322-170.535.amzn1.i686  
    kernel-debuginfo-common-i686-4.14.322-170.535.amzn1.i686  
    perf-4.14.322-170.535.amzn1.i686  
    kernel-tools-4.14.322-170.535.amzn1.i686  
    kernel-4.14.322-170.535.amzn1.i686  
    kernel-headers-4.14.322-170.535.amzn1.i686  
  
src:  
    kernel-4.14.322-170.535.amzn1.src  
  
x86_64:  
    kernel-debuginfo-common-x86_64-4.14.322-170.535.amzn1.x86_64  
    kernel-debuginfo-4.14.322-170.535.amzn1.x86_64  
    perf-debuginfo-4.14.322-170.535.amzn1.x86_64  
    kernel-devel-4.14.322-170.535.amzn1.x86_64  
    perf-4.14.322-170.535.amzn1.x86_64  
    kernel-4.14.322-170.535.amzn1.x86_64  
    kernel-headers-4.14.322-170.535.amzn1.x86_64  
    kernel-tools-4.14.322-170.535.amzn1.x86_64  
    kernel-tools-devel-4.14.322-170.535.amzn1.x86_64  
    kernel-tools-debuginfo-4.14.322-170.535.amzn1.x86_64  

Additional References

Red Hat: CVE-2023-3390, CVE-2023-34319, CVE-2023-4128, CVE-2023-4206, CVE-2023-4208, CVE-2024-0639

Mitre: CVE-2023-3390, CVE-2023-34319, CVE-2023-4128, CVE-2023-4206, CVE-2023-4208, CVE-2024-0639