QID 355864

QID 355864: Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2023-051

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 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 flaw was found in the linux kernel's tun/tap functionality.
This issue could allow a local user to bypass network filters and gain unauthorized access to some resources.
The original patches fixing( CVE-2023-1076 are incorrect or incomplete.
The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate. (
( CVE-2023-4194)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2KERNEL-5.4-2023-051 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 355864

    CVE-2023-34319 | CVE-2023-4128 | CVE-2023-4194 | CVE-2023-3212 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2KERNEL-5.4-2023-051 amazon linux 2 URL Logo alas.aws.amazon.com/AL2/ALASKERNEL-5.4-2023-051.html
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