challack

CVE-2016-5696 の概念実証コード このコードは現在、接続のリセットやセッションへの注入を可能にします。攻撃はクライアントとサーバーの両方に対して実装されています。 詳細については、元の論文を参照してください： オフパスTCPエクスプロイト：グローバルレート制限の危険性 必要条件 1. パケットのなりすましができる必要があります（出口フィルタリングなし）。 2. challack.c 内の ROUTERMAC と LOCALMAC を、なりすまし対応マシンの詳細で更新する必要があります。 3...

Unbreakable Enterprise kernel security update

6.12.0-206.104.3.3 - inet: frags: strip GSO state from fragments before reassembly Xinyang Ge Orabug: 39974840 CVE-2026-80590 6.12.0-206.104.3.2 - KVM: x86: Cancel delayed I/O APIC EOI handling before destroying vCPUs Weiming Shi Orabug: 39931938 CVE-2026-74517 - tcp: challenge ACK for non-exact...

AZL-95003 CVE-2026-68118 affecting package kernel 6.6.150.1-1

In the Linux kernel, the following vulnerability has been resolved: tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcpcheckreq accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request...

UBUNTU-CVE-2026-68118

In the Linux kernel, the following vulnerability has been resolved: tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcpcheckreq accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request...

CVE-2026-68118

In the Linux kernel, the following vulnerability has been resolved: tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcpcheckreq accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request...

EUVD-2026-55499

In the Linux kernel, the following vulnerability has been resolved: tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcpcheckreq accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request...

CVE-2026-68118 tcp: challenge ACK for non-exact RST in SYN-RECEIVED

In the Linux kernel, the following vulnerability has been resolved: tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcpcheckreq accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request...

PT-2026-69518

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the tcp check req function within the SYN-RECEIVED request-socket path. The system accepts an in-window RST Reset packet without requiring the SEG.SEQ variable to...

Linux Distros Unpatched Vulnerability : CVE-2026-68118

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcpcheckreq accepts an in-window RST without requiring SEG.SEQ to...

CVE-2026-4247

When a challenge ACK is to be sent tcprespond constructs and sends the challenge ACK and consumes the mbuf that is passed in. When no challenge ACK should be sent the function returns and leaks the mbuf. If an attacker is either on path with an established TCP connection, or can themselves...

CVE-2026-4247 TCP: remotely exploitable DoS vector (mbuf leak)

When a challenge ACK is to be sent tcprespond constructs and sends the challenge ACK and consumes the mbuf that is passed in. When no challenge ACK should be sent the function returns and leaks the mbuf. If an attacker is either on path with an established TCP connection, or can themselves...

FreeBSD : FreeBSD -- TCP: remotely exploitable DoS vector (mbuf leak) (7aa913e9-28d1-11f1-b35e-bc241121aa0a)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 7aa913e9-28d1-11f1-b35e-bc241121aa0a advisory. When a challenge ACK is to be sent tcprespond constructs and sends the challenge ACK and consumes the...

PT-2026-28217

When a challenge ACK is to be sent tcp respond constructs and sends the challenge ACK and consumes the mbuf that is passed in. When no challenge ACK should be sent the function returns and leaks the mbuf. If an attacker is either on path with an established TCP connection, or can themselves...

Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-003058)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-003058 advisory. net/ipv4/tcpinput.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hija...

Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-003431)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-003431 advisory. net/ipv4/tcpinput.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hija...

Debian: Security Advisory (DLA-609-1)

The remote host is missing an update for the Debian SPDX-FileCopyrightText: 2023 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

Slackware: Security Advisory (SSA:2016-242-01)

The remote host is missing an update for the SPDX-FileCopyrightText: 2022 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

TCP Session Hijack

kernel-rt is vulnerable to TCP session hijack attacks. The vulnerability exists as net/ipv4/tcpinput.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hijack TCP sessions via a blind in-window attack...

Linux kernel - challenge ack information leak

net/ipv4/tcpinput.c in certain Linux kernel versions does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hijack TCP sessions via a blind in-window attack...

SUSE SLES11 Security Update : kernel (SUSE-SU-2016:2976-1)

The SUSE Linux Enterprise 11 SP4 kernel was updated to receive various security and bugfixes. For the PowerPC64 a new 'bigmem' flavor has been added to support big Power machines. FATE319026 The following security bugs were fixed : - CVE-2016-7042: The prockeysshow function in security/keys/proc....