Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: mptcp: Properly handling disconnections due to fastopen. Syzbot was able to trigger data stream corruption: WARNING: CPU: 0 PID: 9846 at net/mptcp/protocol.c:1024 mptcpcleanuna+0xddb/0xff0 net/mptcp/protocol.c:1024 Modules...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: TCP: Fixed issues related to data races around sysctltcpfastopenblackholetimeout. When reading sysctltcpfastopenblackholetimeout, it can be changed concurrently. Therefore, we need to add READONCE to its readers...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerability has been resolved: TCP: Fixed issues related to data races around sysctltcpfastopen. When reading sysctltcpfastopen, it can be changed concurrently. Therefore, we need to add READONCE to its readers...

SUSE CVE-2026-80585

In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty...

CVE-2026-80585

In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty...

AZL-97842 CVE-2026-80585 affecting package kernel for versions less than 6.6.157.1-1

In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty...

CVE-2026-80585 mptcp: fastopen: only mark MPTFO subflows with SYN data

In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty...

CVE-2026-80585 mptcp: fastopen: only mark MPTFO subflows with SYN data

In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty...

CVE-2026-80585: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no data. In that case the child socket's receive queue is intentionally left empty...

PT-2026-82201

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the Multipath TCP MPTCP implementation regarding TCP Fast Open TFO. The function mptcp fastopen subflow synack set params incorrectly sets the is mptfo flag before...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: In tcpconnrequest, do not call reqskfastopenremove. The syzbot reported the following issue in tcpconnrequest: 0 If a listener is closed while a TFO socket is being processed in tcpconnrequest, inetcskreqskqueueadd does not set...

CVE-2026-63828

In the Linux kernel, the following vulnerability has been resolved: apparmor: mediate the implicit connect of TCP fast open sendmsg sendmsg/sendto with MSGFASTOPEN is a combination of connect2 and write2: it opens the connection in the SYN. apparmorsocketsendmsg only checks AAMAYSEND, so a profil...

PT-2026-61144

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in AppArmor where the sendmsg and sendto functions, when used with the MSG FASTOPEN flag, combine the actions of connect2 and write2 to open a connection during the SYN...

CVE-2026-39418

MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, sandbox network protection can be bypassed by using socket.sendto with the MSGFASTOPEN flag. This allows authenticated user with tool-editing permissions to reach internal services that are explicitly blocked by the...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mptcp: fixed the NULL pointer dereferencing issue in the early fallback to fastopen. In the event of an early fallback to TCP, subflowsynrecvsock deletes the subflow context before returning the newly allocated socket to the...

OESA-2026-2076 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: In the Linux kernel, the following vulnerability has been resolved: tcp: Clear tcpsksk-fastopenrsk in tcpdisconnect. syzbot reported the splat below where a socket had tcpsksk-fastopenrsk in the TCPESTABLISHED state. 0 syzbot...

Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013847)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-013847 advisory. In the Linux kernel, the following vulnerability has been resolved: tcp: Don't call reqskfastopenremove in tcpconnrequest. syzbot reported the splat below in...

CVE-2026-39418

MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, sandbox network protection can be bypassed by using socket.sendto with the MSGFASTOPEN flag. This allows authenticated user with tool-editing permissions to reach internal services that are explicitly blocked by the...

CVE-2026-39418 MaxKB: SSRF via sandbox network hook bypass

MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, sandbox network protection can be bypassed by using socket.sendto with the MSGFASTOPEN flag. This allows authenticated user with tool-editing permissions to reach internal services that are explicitly blocked by the...

CVE-2026-39418 MaxKB: SSRF via sandbox network hook bypass

MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, sandbox network protection can be bypassed by using socket.sendto with the MSGFASTOPEN flag. This allows authenticated user with tool-editing permissions to reach internal services that are explicitly blocked by the...