EUVD-2026-108719

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntrackexpect: zero at allocation time There are occasional LLM hints wrt. leaking uninitialized data to userspace via ctnetlink. Just zero at allocation time, expectations are not frequently used these days...

CVE-2026-98873

The Linux kernel contains a vulnerability in the netfilter component specifically within nf_conntrack_expect . The root cause is a zero at allocation time issue, where data might not be properly initialized. While there are reports of potential uninitialized data leakage to userspace via ctnetlin...

Siemens SIMATIC S7-1500 TM MFP Improper Input Validation (CVE-2026-31407)

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntrackexpect: Use expect-helper. Use expect-helper in ctnetlink and /proc to dump the helper’s name. Using nfcthelp without holding a reference to the master conntrack is unsafe. Use exp-master-helper in the...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ensure safe access to master conntrack Holding a reference to the expectation is not sufficient; the master conntrack object can simply disappear, making exp-master invalid. To access exp-master safely: -...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: netfilter: ctnetlink: Use netlink policy range checks. Replace manual range and mask validations with netlink policy annotations in the ctnetlink code paths. This ensures that the netlink core rejects invalid values early and...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers The pattern is the same as the previous patch: do not keep the expectation object alive via refcount; instead, only store a cookie value and then use that value as a...

Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: Use a helper function to calculate the expected ID. The deletion of the expectation path requires a call to the nfexpectgetid helper function to calculate the expected ID. Otherwise, the ID of the expectatio...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: Fields related to NAT expectations are set to zero when CTAEXPECTNAT is not present. The ctnetlinkallocexpect function allocates expectations from a non-zeroing slab cache via nfctexpectalloc. When...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ignore explicit helpers under new expectations The existing master conntrack helper should be used; anything else is not truly supported, and it only complicates validation. Therefore, ignore whatever helper...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: fix use-after-free in ctnetlinkdumpexpct The ctnetlinkdumpexpct function stores a conntrack pointer in cb-data for the netlink dump callback ctnetlinkexpctdumptable. However, the conntrack reference is dropp...

Astra Linux – Vulnerability in Linux

In the Linux kernel up to version 5.8.7, local attackers who were able to inject conntrack netlink configurations could exploit an overflow in a local buffer, resulting in crashes or triggering the use of incorrect protocol numbers in ctnetlinkparsetuplefilter in net/netfilter/nfconntracknetlink....

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-053398)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-053398 advisory. In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: use helper function to calculate expect ID Delete expectation path is missi...

kernel: netfilter: ctnetlink: ensure safe access to master conntrack

A flaw was found in the netfilter: ctnetlink component of the Linux kernel. This vulnerability occurs due to insufficient locking when accessing the master conntrack object, allowing it to become invalid while still being referenced. A local attacker could potentially exploit this race condition,...

RHEL 7 : kernel-rt (RHSA-2026:63189)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:63189 advisory. The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism...

kernel: netfilter: ctnetlink: ensure safe access to master conntrack

A flaw was found in the netfilter: ctnetlink component of the Linux kernel. This vulnerability occurs due to insufficient locking when accessing the master conntrack object, allowing it to become invalid while still being referenced. A local attacker could potentially exploit this race condition,...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098785)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098785 advisory. In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ignore explicit helper on new expectations Use the existing master conntrac...

Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102132)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-102132 advisory. In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ignore explicit helper on new expectations Use the existing master conntrac...

EulerOS 2.0 SP15 : kernel (EulerOS-SA-2026-2889)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : mm: blk-cgroup: fix use-after-free in cgwbreleaseworkfnCVE-2026-31586 e1000/e1000e: Fix leak in DMA error cleanupCVE-2026-43445 futex: Clear stale...

kernel security update

An update is available for kernel. This update affects Rocky Linux 8. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list The kernel packages contain the Linux kernel, the core of any Linux operating...