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    CVE-2023-31248

    Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability; `nft_chain_lookup_byid()` failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network namespace

    Published:Jul 5, 2023
    Last Modified:Mar 5, 2025
    EPS:Jul 5, 2023
    EPSS Score:0.0022
    CVSS Score:7.8

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.html
    http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html
    http://www.openwall.com/lists/oss-security/2023/07/05/2
    https://lists.debian.org/debian-lts-announce/2023/08/msg00001.html
    https://lists.fedoraproject.org/archives/list/[email protected]/message/RGZC5XOANA75OJ4XARBBXYSLDKUIJI5E/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/UPHI46ROSSLVAV4R5LJWJYU747JGOS6D/
    https://lore.kernel.org/netfilter-devel/[email protected]/T/
    https://security.netapp.com/advisory/ntap-20240201-0001/
    https://www.debian.org/security/2023/dsa-5453
    https://www.openwall.com/lists/oss-security/2023/07/05/2
    http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.html
    http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html
    http://www.openwall.com/lists/oss-security/2023/07/05/2
    https://lists.debian.org/debian-lts-announce/2023/08/msg00001.html
    https://lists.fedoraproject.org/archives/list/[email protected]/message/RGZC5XOANA75OJ4XARBBXYSLDKUIJI5E/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/UPHI46ROSSLVAV4R5LJWJYU747JGOS6D/
    https://lore.kernel.org/netfilter-devel/[email protected]/T/
    https://security.netapp.com/advisory/ntap-20240201-0001/
    https://www.debian.org/security/2023/dsa-5453
    https://www.openwall.com/lists/oss-security/2023/07/05/2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High