EUVD-2026-55436

In the Linux kernel, the following vulnerability has been resolved: rds: drop incoming messages that cross network namespace boundaries rdsfindbound looks up the destination socket using a global rhashtable keyed solely on addr, port, scopeid. Network namespaces are not part of the key, so a send...

CVE-2026-68294

The CVE CVE-2026-68294 affects the Linux kernel QRTR transport (AF_QIPCRTR) by not isolating its global state per network namespace. qrtr_local_nid and qrtr_ports are shared globally and lack namespace checks; qrtr_create() does not restrict the namespace for new sockets. This enables an unprivil...

EUVD-2026-55547

In the Linux kernel, the following vulnerability has been resolved: sctp: close UDP tunnel sockets during netns teardown procsctpdoudpport starts per-net SCTP UDP tunneling sockets when net.sctp.udpport is set, and stops/restarts them when the sysctl value changes. The netns exit path does not st...

CVE-2026-68142

The Linux kernel vulnerability CVE-2026-68142 affects the geneve tunnel implementation. It occurs in the changelink flow for Geneve devices where the boundary of CAP_NET_ADMIN is checked only against the dev_net, allowing an attacker privileged in that netns but not in the geneve->net underlay...

EUVD-2026-55525

In the Linux kernel, the following vulnerability has been resolved: geneve: require CAPNETADMIN in the device netns for changelink A tunnel changelink operates on at most two netns, devnetdev and the sticky underlay netns geneve-net. They differ once the device is created in or moved to a netns...

Astra Linux – Vulnerability found in Linux 6.1, Linux 6.12

In the Linux kernel, the following vulnerability has been resolved: ppp: The requirement for CAPNETADMIN in the target netns is necessary for unattached IOCTls. The opening of /dev/ppp is currently allowed for file-fcred-userns, while unattached administrative IOCTls operate on...

RLSA-2026:49214 Important: kernel security update

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: rtnetlink: add missing netlinknscapable check for peer netns CVE-2026-31692 kernel: netfilter: ctnetlink: ensure safe access to master conntrack CVE-2026-43116 kernel: fanotify: fix false...

kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns

A flaw was found in the Linux kernel's rtnetlink component. An unprivileged local user, leveraging a user namespace, can exploit a missing CAPNETADMIN capability check in the rtnlnewlink function. This allows the user to create paired network devices in arbitrary network namespaces, including the...

kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns

A flaw was found in the Linux kernel's rtnetlink component. An unprivileged local user, leveraging a user namespace, can exploit a missing CAPNETADMIN capability check in the rtnlnewlink function. This allows the user to create paired network devices in arbitrary network namespaces, including the...

CVE-2026-64542

A flaw was found in the Linux kernel's IPv6 Neighbor Discovery NDISC component. An unprivileged user, operating within a network namespace, can trigger a null pointer dereference in the acceptuntrackedna function. This occurs due to a race condition where the inet6dev structure is re-fetched...

CVE-2026-64542

In the Linux kernel, the following vulnerability has been resolved: ipv6: ndisc: fix NULL deref in acceptuntrackedna acceptuntrackedna re-fetches the inet6dev with in6devgetdev and dereferences idev-cnf.acceptuntrackedna without a NULL check, even though its only caller ndiscrecvna already fetche...

CVE-2026-64542 ipv6: ndisc: fix NULL deref in accept_untracked_na()

In the Linux kernel, the following vulnerability has been resolved: ipv6: ndisc: fix NULL deref in acceptuntrackedna acceptuntrackedna re-fetches the inet6dev with in6devgetdev and dereferences idev-cnf.acceptuntrackedna without a NULL check, even though its only caller ndiscrecvna already fetche...

CVE-2026-64542 ipv6: ndisc: fix NULL deref in accept_untracked_na()

In the Linux kernel, the following vulnerability has been resolved: ipv6: ndisc: fix NULL deref in acceptuntrackedna acceptuntrackedna re-fetches the inet6dev with in6devgetdev and dereferences idev-cnf.acceptuntrackedna without a NULL check, even though its only caller ndiscrecvna already fetche...

CVE-2026-64542

Summary: CVE-2026-64542 in the Linux kernel fixes a NULL dereference in IPv6 neighbor discovery. The vulnerable path occurs in accept_untracked_na(), which re-fetches inet6_dev via __in6_dev_get(dev) and accesses idev->cnf.accept_untracked_na without a NULL check, despite ndisc_recv_na() havin...

SUSE CVE-2026-64422

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes Reject invalid net.ipv4.tcpreordering values before they reach TCP socket state. The sysctl is stored as an int but copied into the u32 tp-reordering field for new...

CVE-2026-64422

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes Reject invalid net.ipv4.tcpreordering values before they reach TCP socket state. The sysctl is stored as an int but copied into the u32 tp-reordering field for new...

UBUNTU-CVE-2026-64422

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes Reject invalid net.ipv4.tcpreordering values before they reach TCP socket state. The sysctl is stored as an int but copied into the u32 tp-reordering field for new...

CVE-2026-64525

The CVE describes a Linux kernel xfrm policy_bydst RCU synchronization issue where xfrm_policy_fini() called synchronize_rcu() during namespace exit, causing long RCUs and heavy cleanup workload when many namespaces are torn down. The fix moves the policy flush and related workqueue drains into a...

CVE-2026-64422 net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes Reject invalid net.ipv4.tcpreordering values before they reach TCP socket state. The sysctl is stored as an int but copied into the u32 tp-reordering field for new...

EUVD-2026-48966

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes Reject invalid net.ipv4.tcpreordering values before they reach TCP socket state. The sysctl is stored as an int but copied into the u32 tp-reordering field for new...