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CVE-2023-3390 is an important-severity use-after-free flaw in the Linux kernel's Netfilter/nftables subsystem. Improper handling of named and anonymous sets in batch requests can allow a local attacker with CAP_NET_ADMIN to read and write arbitrary kernel memory, potentially causing denial of service or escalating privileges. Red Hat rates the vulnerability CVSS 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Unprivileged user namespaces can enable local unprivileged RHEL users to obtain the capability needed for exploitation. Red Hat released fixes for affected RHEL 8 kernel, kernel-rt, and kpatch packages, with updates issued from September 2023 through March 2024. OpenShift control-plane hosts contain the affected component, but Red Hat assesses container exploitation risk as low because OpenShift namespace controls prevent containers from obtaining the required capability.
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4 events from the most recent confirmed update back to the earliest known activity.
Red Hat issued RHEL 7 kernel, kernel-rt, and kpatch-patch fixes for CVE-2023-32233 through RHSA-2023:5622, RHSA-2023:5621, and RHSA-2023:5574. The updates addressed a Netfilter nf_tables use-after-free flaw that could enable kernel-memory reads and writes for a local attacker with CAP_NET_ADMIN.
Red Hat issued fixes for RHEL 8 kernel, kernel-rt, and kpatch-patch packages through RHSA-2023:5244, RHSA-2023:5255, and RHSA-2023:5221. RHEL 8.1 Update Services for SAP Solutions also received kernel and kpatch-patch fixes via RHSA-2023:5238 and RHSA-2023:5235.
Red Hat released RHEL 8.2 kernel fixes through RHSA-2024:1268 and a Telecommunications Update Service kernel-rt fix through RHSA-2024:1269. It also issued a kpatch-patch fix for RHEL 8.2 Update Services for SAP Solutions via RHSA-2024:1278.
Alagu M of the Salesforce Offensive Security team reported CVE-2023-3390, a use-after-free flaw in Netfilter handling of named and anonymous nftables sets in batch requests. A local attacker with CAP_NET_ADMIN could obtain arbitrary kernel-memory reads and writes, potentially causing denial of service or privilege escalation.
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**CVE-2024-27397** is a use-after-free flaw in the Linux kernel's `netfilter`/`nf_tables` subsystem. During control-plane transactions, a set element with a timeout could expire before the transaction completed because affected set backends did not use a transaction-start timestamp. A local low-privileged attacker could potentially crash an affected host or elevate privileges; the vulnerability affects code introduced in Linux kernel 4.1. The issue is fixed in Linux kernel 6.7.5, 6.8, and later stable releases. Red Hat issued corrected `kernel` and `kernel-rt` packages for multiple RHEL 8 and 9 streams and rates the flaw Moderate, while CVSS assessments range from 7.0 to 7.8 depending on assumed attack complexity. Organizations should deploy current vendor kernel updates rather than cherry-picking patches; non-containerized RHEL 8 systems may temporarily disable user namespaces, but this mitigation must not be used on OpenShift because its containers require user namespaces.
Aug 26, 2026
A use-after-free flaw in the Linux kernel's Netfilter nftables `nft_pipapo_walk` function, tracked as **CVE-2023-6817**, can allow a local attacker with `CAP_NET_ADMIN` to crash a host, disclose information, or elevate privileges. The defect allowed inactive PIPAPO set elements to be processed and deactivated twice during a set walk, leading to a kernel crash; it carries a CVSS v3.1 score of 7.8. Linux kernel commit `317eb9685095678f2c9f5a8189de698c5354316a` fixes the issue by verifying that an element is active before invoking the iterator callback. Red Hat issued fixes for affected RHEL 8 `kernel` and `kernel-rt` packages; systems with unprivileged user namespaces enabled may let unprivileged users obtain the required capability. OpenShift Container Platform inherits the affected code through RHCOS, but Red Hat rates impact as Low because its namespace model prevents containers from acquiring the capabilities needed to exploit the flaw.
Aug 26, 2026
Red Hat addressed **CVE-2023-35001**, a high-severity out-of-bounds memory-access vulnerability in the Linux kernel Netfilter `nf_tables` implementation, specifically the `nft_byteorder_eval()` function. Failed bounds checking and incorrect data alignment can allow an attacker holding `CAP_NET_ADMIN` in a user or network namespace to escalate privileges locally; Red Hat assigned a CVSS v3.1 score of 7.8, with high impacts to confidentiality, integrity, and availability. Affected Red Hat Enterprise Linux 7 and 8 kernel, real-time kernel, and kpatch packages received fixes through 2023 advisories. RHSA-2023:7243 supplies fixed `3.10.0-1062.80.1.el7` kernel packages for RHEL 7.7 AUS on x86_64; organizations must reboot after installation. Until updates can be deployed, Red Hat recommends blacklisting the affected Netfilter kernel module to prevent it from loading.
Aug 26, 2026