Amazon Linux 2 Security Advisory: ALAS2-2023-2268
Advisory Released Date: 2023-10-05
Advisory Updated Date: 2025-10-18
FAQs regarding Amazon Linux ALAS/CVE Severity
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)
The fix for XSA-423 added logic to Linux'es netback driver to deal with
a frontend splitting a packet in a way such that not all of the headers
would come in one piece. Unfortunately the logic introduced there
didn't account for the extreme case of the entire packet being split
into as many pieces as permitted by the protocol, yet still being
smaller than the area that's specially dealt with to keep all (possible)
headers together. Such an unusual packet would therefore trigger a
buffer overrun in the driver. (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)
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: Fix UAF in svc_tcp_listen_data_ready() (CVE-2023-52885)
In the Linux kernel, the following vulnerability has been resolved:
igb: Fix igb_down hung on surprise removal (CVE-2023-53148)
In the Linux kernel, the following vulnerability has been resolved:
scsi: qla2xxx: Pointer may be dereferenced (CVE-2023-53150)
In the Linux kernel, the following vulnerability has been resolved:
md/raid10: prevent soft lockup while flush writes (CVE-2023-53151)
In the Linux kernel, the following vulnerability has been resolved:
ipv6/addrconf: fix a potential refcount underflow for idev (CVE-2023-53189)
In the Linux kernel, the following vulnerability has been resolved:
sched/fair: Don't balance task to its current running CPU (CVE-2023-53215)
In the Linux kernel, the following vulnerability has been resolved:
jfs: jfs_dmap: Validate db_l2nbperpage while mounting (CVE-2023-53222)
In the Linux kernel, the following vulnerability has been resolved:
md/raid10: fix wrong setting of max_corr_read_errors (CVE-2023-53313)
In the Linux kernel, the following vulnerability has been resolved:
scsi: qla2xxx: Wait for io return on terminate rport (CVE-2023-53322)
In the Linux kernel, the following vulnerability has been resolved:
ip6mr: Fix skb_under_panic in ip6mr_cache_report() (CVE-2023-53365)
In the Linux kernel, the following vulnerability has been resolved:
scsi: qla2xxx: Fix potential NULL pointer dereference (CVE-2023-53451)
In the Linux kernel, the following vulnerability has been resolved:
net: usbnet: Fix WARNING in usbnet_start_xmit/usb_submit_urb (CVE-2023-53548)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free (CVE-2023-53619)
In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Fix deadloop issue on reading trace_pipe (CVE-2023-53668)
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 or yum update --advisory ALAS2-2023-2268 to update your system.
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
2025-10-18: CVE-2023-53548 was added to this advisory.
2025-10-18: CVE-2023-53451 was added to this advisory.
2025-10-18: CVE-2023-53619 was added to this advisory.
2025-10-18: CVE-2023-53668 was added to this advisory.
2025-10-02: CVE-2023-53151 was added to this advisory.
2025-10-02: CVE-2023-53215 was added to this advisory.
2025-10-02: CVE-2023-53150 was added to this advisory.
2025-10-02: CVE-2023-53313 was added to this advisory.
2025-09-23: CVE-2023-53222 was added to this advisory.
2025-09-23: CVE-2023-53189 was added to this advisory.
2025-09-23: CVE-2023-53148 was added to this advisory.
2025-09-23: CVE-2023-53322 was added to this advisory.
2025-09-23: CVE-2023-53365 was added to this advisory.
2025-02-26: CVE-2023-52885 was added to this advisory.
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.