Important: kernel

Issue Overview:

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

2023-10-25: CVE-2023-3390 was added to this advisory.

2023-10-12: CVE-2023-4128 was added to this advisory.

2023-10-12: CVE-2023-34319 was added to this advisory.

2023-10-12: CVE-2023-3212 was added to this advisory.

A flaw in the Linux Kernel found in the GFS2 file system. On corrupted gfs2 file systems the evict code can try to reference the journal descriptor structure, jdesc, after it has been freed and set to NULL. It can lead to null pointer dereference when gfs2_trans_begin being called and then fail ingfs2_evict_inode(). (CVE-2023-3212)

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

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-4.14.322-244.536.amzn2.aarch64  
    kernel-headers-4.14.322-244.536.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.322-244.536.amzn2.aarch64  
    perf-4.14.322-244.536.amzn2.aarch64  
    perf-debuginfo-4.14.322-244.536.amzn2.aarch64  
    python-perf-4.14.322-244.536.amzn2.aarch64  
    python-perf-debuginfo-4.14.322-244.536.amzn2.aarch64  
    kernel-tools-4.14.322-244.536.amzn2.aarch64  
    kernel-tools-devel-4.14.322-244.536.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.322-244.536.amzn2.aarch64  
    kernel-devel-4.14.322-244.536.amzn2.aarch64  
    kernel-debuginfo-4.14.322-244.536.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.322-244.536.amzn2.i686  
  
src:  
    kernel-4.14.322-244.536.amzn2.src  
  
x86_64:  
    kernel-4.14.322-244.536.amzn2.x86_64  
    kernel-headers-4.14.322-244.536.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.322-244.536.amzn2.x86_64  
    perf-4.14.322-244.536.amzn2.x86_64  
    perf-debuginfo-4.14.322-244.536.amzn2.x86_64  
    python-perf-4.14.322-244.536.amzn2.x86_64  
    python-perf-debuginfo-4.14.322-244.536.amzn2.x86_64  
    kernel-tools-4.14.322-244.536.amzn2.x86_64  
    kernel-tools-devel-4.14.322-244.536.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.322-244.536.amzn2.x86_64  
    kernel-devel-4.14.322-244.536.amzn2.x86_64  
    kernel-debuginfo-4.14.322-244.536.amzn2.x86_64  
    kernel-livepatch-4.14.322-244.536-1.0-0.amzn2.x86_64  

Additional References

Red Hat: CVE-2023-3212, CVE-2023-3390, CVE-2023-34319, CVE-2023-4128, CVE-2023-4206, CVE-2023-4208, CVE-2024-0639

Mitre: CVE-2023-3212, CVE-2023-3390, CVE-2023-34319, CVE-2023-4128, CVE-2023-4206, CVE-2023-4208, CVE-2024-0639