Debian Security Advisory

DSA-5402-1 linux -- security update

Date Reported:
13 May 2023
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2023-0386, CVE-2023-31436, CVE-2023-32233.
More information:

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: