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Vulnerability · Published Mar 14, 2025 · Assigned by Linux

CVE-2023-52927netfilter: allow exp not to be removed in nf_ct_find_expectation

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 75.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

In the Linux kernel, the following vulnerability has been resolved: netfilter: allow exp not to be removed in nf_ct_find_expectation Currently nf_conntrack_in() calling nf_ct_find_expectation() will remove the exp from the hash table. However, in some scenario, we expect the exp not to be removed when the created ct will not be confirmed, like in OVS and TC conntrack in the following patches. This patch allows exp not to be removed by setting IPS_CONFIRMED in the status of the tmpl.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.133-1DEBIAN-CVE-2023-52927
Debian:12linux6.1.133-1DSA-5900-1
Debian:13linux6.6.8-1DEBIAN-CVE-2023-52927
Debian:14linux6.6.8-1DEBIAN-CVE-2023-52927
Ubuntu:22.04:LTSlinux5.15.0-139.149USN-7494-1
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-aws5.15.0-1083.90USN-7494-1
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-azure5.15.0-1088.97USN-7494-4
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1088.97.1USN-7494-4
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-gcp5.15.0-1082.91USN-7494-1
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-gke5.15.0-1080.86USN-7494-1
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1065.73USN-7494-1
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-ibm5.15.0-1075.78USN-7494-1
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1078.84USN-7494-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1079.84USN-7494-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-139.149USN-7494-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1077.78USN-7494-1
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1036.36USN-7494-1
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1024.24USN-7494-1
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-oracle5.15.0-1080.86USN-7494-1
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-raspi5.15.0-1077.80USN-7494-1
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-52927
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-52927
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1050.54USN-7602-1

Affected products (as reported)

VendorProductVersions
Linux Linux 1bc91a5ddf3eaea0e0ea957cccf3abdcfcace00e – before 3fa58a6fbd1e9e5682d09cdafb08fba004cb12ec1bc91a5ddf3eaea0e0ea957cccf3abdcfcace00e – before 4914109a8e1e494c6aa9852f9e84ec77a5fc643f
Linux Linux 5.18

References