UBUNTU-CVE-2026-31427

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntracksip: fix use of uninitialized rtpaddr in processsdp processsdp declares union nfinetaddr rtpaddr on the stack and passes it to the nfnatsip sdpsession hook after walking the SDP media descriptions. However...

CVE-2026-31427

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntracksip: fix use of uninitialized rtpaddr in processsdp processsdp declares union nfinetaddr rtpaddr on the stack and passes it to the nfnatsip sdpsession hook after walking the SDP media descriptions. However...

CVE-2026-31414

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 name. Using nfcthelp without holding a reference to the master conntrack is unsafe. Use exp-master-helper in ctnetlink pa...

CVE-2026-31414

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 name. Using nfcthelp without holding a reference to the master conntrack is unsafe. Use exp-master-helper in ctnetlink pa...

ROS-20260407-73-0015

A vulnerability in the nfconntracknetlink.c component of the Linux operating system kernel is related to errors in updating the link counter. Exploitation of the vulnerability allows an attacker to cause a denial of service...

UBUNTU-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...

Invisible Adversaries: A Systematic Study of Session Manipulation Attacks on VPNs

Virtual Private Networks VPNs are widely used for censorship evasion and traffic protection. VPN users expect to be provided with adequate security protection, and at the same time not be affected by other users connected to the same VPN server, which can be illustrated as the non-interference...

EUVD-2026-18712

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntrackh323: fix OOB read in decodeint CONS case In decodeint, the CONS case calls getbitsbs, 2 to read a length value, then calls getuintbs, len without checking that len bytes remain in the buffer. The existing...

CVE-2026-23456

A flaw was found in the Linux kernel's netfilter H.323 connection tracking module. A remote attacker could exploit this vulnerability by sending a specially crafted H.323/RAS H.323 Registration, Admission, and Status packet. The system's processing of these packets could lead to an out-of-bounds...

UBUNTU-CVE-2026-23456

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntrackh323: fix OOB read in decodeint CONS case In decodeint, the CONS case calls getbitsbs, 2 to read a length value, then calls getuintbs, len without checking that len bytes remain in the buffer. The existing...

UBUNTU-CVE-2026-23455

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntrackh323: check for zero length in DecodeQ931 In DecodeQ931, the UserUserIE code path reads a 16-bit length from the packet, then decrements it by 1 to skip the protocol discriminator byte before passing it to...

PT-2026-30150

Name of the Vulnerable Software and Affected Versions Linux kernel versions 5.10 through 6.19 Description An out-of-bounds read exists in the H.323 connection tracking parser within the netfilter module. The issue occurs in the DecodeQ931 function during the processing of Q.931 signaling messages...

PT-2026-30151

Name of the Vulnerable Software and Affected Versions The Linux kernel affected versions not specified Description A flaw exists in the sip help tcp function within the netfilter module. This function parses the SIP Content-Length header using simple strtoul, which returns an unsigned long, but...

netfilter: xt_CT: drop pending enqueued packets on template removal

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EUVD-2026-15392

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtCT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy,...

CVE-2026-23391

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtCT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy,...

CVE-2026-23391

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtCT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy,...

CVE-2026-23016

In the Linux kernel, the following vulnerability has been resolved: inet: frags: drop fraglist conntrack references Jakub added a warning in nfconntrackcleanupnetlist to make debugging leaked skbs/conntrack references more obvious. syzbot reports this as triggering, and I can also reproduce this...

CVE-2026-23016

The CVE concerns the Linux kernel’s conntrack/frag handling (inet: frags: drop fraglist conntrack references). A bug allows reassembled skb fragments to retain nf_conn references via frag_list, causing conntrack cleanup to block (hangs up to ~60s) when fragmentation/reassembly occurs (UDP/TCP pat...

Linux Kernel Security Vulnerabilities

The Linux kernel is the core of the open-source operating system Linux, developed by the Linux Foundation in the United States. There is a security vulnerability in the Linux kernel, which stems from fraglist not releasing connection tracking references. This could lead to memory leaks and blocki...