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Related Vulnerabilities: CVE-2023-31085 CVE-2023-34324 CVE-2023-42754

An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2. There is a divide-by-zero error in do_div(sz,mtd->erasesize), used indirectly by ctrl_cdev_ioctl, when mtd->erasesize is 0. (CVE-2023-31085) A flaw in the kernel Xen event handler can cause a deadlock with Xen console handling in unprivileged Xen guests. (CVE-2023-34324) ipv4: fix null-deref in ipv4_link_failure NOTE: https://www.openwall.com/lists/oss-security/2023/10/02/8NOTE: https://git.kernel.org/linus/0113d9c9d1ccc07f5a3710dac4aa24b6d711278c (6.6-rc3) (CVE-2023-42754)

Source

ALASKERNEL-5.4-2023-055

Amazon Linux 2 Security Advisory: ALASKERNEL-5.4-2023-055
Advisory Release Date: 2023-10-31 00:16 Pacific
Advisory Updated Date: 2023-11-01 00:49 Pacific

Severity: Medium

References: CVE-2023-31085 CVE-2023-34324 CVE-2023-42754
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2. There is a divide-by-zero error in do_div(sz,mtd->erasesize), used indirectly by ctrl_cdev_ioctl, when mtd->erasesize is 0. (CVE-2023-31085)

A flaw in the kernel Xen event handler can cause a deadlock with Xen console handling in unprivileged Xen guests. (CVE-2023-34324)

ipv4: fix null-deref in ipv4_link_failure

NOTE: https://www.openwall.com/lists/oss-security/2023/10/02/8
NOTE: https://git.kernel.org/linus/0113d9c9d1ccc07f5a3710dac4aa24b6d711278c (6.6-rc3) (CVE-2023-42754)

Affected Packages:

kernel

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

New Packages:

aarch64:
    kernel-5.4.258-171.360.amzn2.aarch64
    kernel-headers-5.4.258-171.360.amzn2.aarch64
    kernel-debuginfo-common-aarch64-5.4.258-171.360.amzn2.aarch64
    perf-5.4.258-171.360.amzn2.aarch64
    perf-debuginfo-5.4.258-171.360.amzn2.aarch64
    python-perf-5.4.258-171.360.amzn2.aarch64
    python-perf-debuginfo-5.4.258-171.360.amzn2.aarch64
    kernel-tools-5.4.258-171.360.amzn2.aarch64
    kernel-tools-devel-5.4.258-171.360.amzn2.aarch64
    kernel-tools-debuginfo-5.4.258-171.360.amzn2.aarch64
    bpftool-5.4.258-171.360.amzn2.aarch64
    bpftool-debuginfo-5.4.258-171.360.amzn2.aarch64
    kernel-devel-5.4.258-171.360.amzn2.aarch64
    kernel-debuginfo-5.4.258-171.360.amzn2.aarch64

i686:
    kernel-headers-5.4.258-171.360.amzn2.i686

src:
    kernel-5.4.258-171.360.amzn2.src

x86_64:
    kernel-5.4.258-171.360.amzn2.x86_64
    kernel-headers-5.4.258-171.360.amzn2.x86_64
    kernel-debuginfo-common-x86_64-5.4.258-171.360.amzn2.x86_64
    perf-5.4.258-171.360.amzn2.x86_64
    perf-debuginfo-5.4.258-171.360.amzn2.x86_64
    python-perf-5.4.258-171.360.amzn2.x86_64
    python-perf-debuginfo-5.4.258-171.360.amzn2.x86_64
    kernel-tools-5.4.258-171.360.amzn2.x86_64
    kernel-tools-devel-5.4.258-171.360.amzn2.x86_64
    kernel-tools-debuginfo-5.4.258-171.360.amzn2.x86_64
    bpftool-5.4.258-171.360.amzn2.x86_64
    bpftool-debuginfo-5.4.258-171.360.amzn2.x86_64
    kernel-devel-5.4.258-171.360.amzn2.x86_64
    kernel-debuginfo-5.4.258-171.360.amzn2.x86_64

Additional References

Red Hat: CVE-2023-31085, CVE-2023-34324, CVE-2023-42754

Mitre: CVE-2023-31085, CVE-2023-34324, CVE-2023-42754

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ALASKERNEL-5.4-2023-055

ALASKERNEL-5.4-2023-055

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