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Debian Security Advisory DSA-5402-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
May 13, 2023                          https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2023-0386 CVE-2023-31436 CVE-2023-32233

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.

CVE-2023-0386

    It was discovered that under certain conditions the overlayfs
    filesystem implementation did not properly handle copy up
    operations. A local user permitted to mount overlay mounts in user
    namespaces can take advantage of this flaw for local privilege
    escalation.

CVE-2023-31436

    Gwangun Jung reported a a flaw causing heap out-of-bounds read/write
    errors in the traffic control subsystem for the Quick Fair Queueing
    scheduler (QFQ) which may result in information leak, denial of
    service or privilege escalation.

CVE-2023-32233

    Patryk Sondej and Piotr Krysiuk discovered a use-after-free flaw in
    the Netfilter nf_tables implementation when processing batch
    requests, which may result in local privilege escalation for a user
    with the CAP_NET_ADMIN capability in any user or network namespace.

For the stable distribution (bullseye), these problems have been fixed in
version 5.10.179-1.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/source-package/linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org

Debian: DSA-5402-1: linux security update

May 13, 2023
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks

Summary

CVE-2023-0386

It was discovered that under certain conditions the overlayfs
filesystem implementation did not properly handle copy up
operations. A local user permitted to mount overlay mounts in user
namespaces can take advantage of this flaw for local privilege
escalation.

CVE-2023-31436

Gwangun Jung reported a a flaw causing heap out-of-bounds read/write
errors in the traffic control subsystem for the Quick Fair Queueing
scheduler (QFQ) which may result in information leak, denial of
service or privilege escalation.

CVE-2023-32233

Patryk Sondej and Piotr Krysiuk discovered a use-after-free flaw in
the Netfilter nf_tables implementation when processing batch
requests, which may result in local privilege escalation for a user
with the CAP_NET_ADMIN capability in any user or network namespace.

For the stable distribution (bullseye), these problems have been fixed in
version 5.10.179-1.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/source-package/linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org

Severity
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.

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