CVE-2026-73261

The Mongoose embedded web server and network library (versions prior to 7.23 ) contains a vulnerability in its built-in TCP/IP stack. Specifically, the handle_opt() function in src/net_builtin.c fails to validate that the opts[1] length of a TCP option does not exceed the remaining option bytes. ...

fraud-bridge

Intro fraud-bridge helps bypassing restrictive censorship environments that block direct TCP or UDP connections, by setting up ICMP, NTP or DNS over IPv4 or IPv6 tunnels. It automatically patches TCP MSS option to achieve a non-fragmented stream of packets known as MSS-clamping to gain performanc...

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

In the Linux kernel, the following vulnerability has been resolved: net: prevented mss overflow in skbsegment Once again, syzbot is able to cause the kernel to crash in skbSegment. “GSOBYFRAGS” is a forbidden value, but unfortunately, the following calculation in skbSegment can easily result in...

MI5 Says China’s MSS Funded Research Involving 100+ U.K.-Linked Academics

The U.K.'s domestic intelligence and security agency has warned that more than 100 academics have helped China boost its intelligence gathering efforts on behalf of Beijing's state security service. In a "Security Service Espionage Alert" issued on September 30, 2026, MI5 said the "primary purpos...

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 sysctltcpbasemss. When reading sysctltcpbasemss, it can be changed concurrently. Therefore, we need to add READONCE to its readers...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mptcp: Initialize rcvmss before calling tcpsendactivereset in mptcpdofastclose. syzbot reported a divide-by-zero issue in tcpselectWindow for MPTCP sockets. 0 We had a similar issue with bare TCP and fixed it in commit 499350a5a6...

AZL-99588 CVE-2026-80847 affecting package kernel 6.6.157.1-1

In the Linux kernel, the following vulnerability has been resolved: tcp: clamp route advmss to TCPMINMSS tcpselectinitialwindow assumes that callers never pass an MSS smaller than 1, but route-derived advmss values can violate that assumption. A too-small explicit RTAXADVMSS is one way to get...

EUVD-2026-71297

In the Linux kernel, the following vulnerability has been resolved: tcp: clamp route advmss to TCPMINMSS tcpselectinitialwindow assumes that callers never pass an MSS smaller than 1, but route-derived advmss values can violate that assumption. A too-small explicit RTAXADVMSS is one way to get...

SUSE CVE-2026-72502

In the Linux kernel, the following vulnerability has been resolved: tcp: ipv6: clamp default adverting MSS to avoid GSOBYFRAGS 0xFFFF When MTU is large, ip6defaultadvmss can return IPV6MAXPLEN 65535. This is interpreted by TCP as mssclamp, allowing the MSS to reach 65535. However, 0xFFFF is also...

CVE-2026-72502

A flaw was found in the Linux kernel. When processing TCP IPv6 packets with a large Maximum Transmission Unit MTU, a specific calculated Maximum Segment Size MSS value can conflict with an internal flag GSOBYFRAGS. A local attacker could send a specially crafted TCP packet that, when processed,...

Unity Linux 20.1050e Security Update: kernel (UTSA-2026-100095)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-100095 advisory. In the Linux kernel, the following vulnerability has been resolved: ibmveth: Disable GSO for packets with small MSS Some physical adapters on Power systems do not...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100752)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-100752 advisory. In the Linux kernel, the following vulnerability has been resolved: ibmveth: Disable GSO for packets with small MSS Some physical adapters on Power systems do not...

UBUNTU-CVE-2026-72502

In the Linux kernel, the following vulnerability has been resolved: tcp: ipv6: clamp default adverting MSS to avoid GSOBYFRAGS 0xFFFF When MTU is large, ip6defaultadvmss can return IPV6MAXPLEN 65535. This is interpreted by TCP as mssclamp, allowing the MSS to reach 65535. However, 0xFFFF is also...

CVE-2026-72502

In the Linux kernel, the following vulnerability has been resolved: tcp: ipv6: clamp default adverting MSS to avoid GSOBYFRAGS 0xFFFF When MTU is large, ip6defaultadvmss can return IPV6MAXPLEN 65535. This is interpreted by TCP as mssclamp, allowing the MSS to reach 65535. However, 0xFFFF is also...

CVE-2026-72502 tcp: ipv6: clamp default adverting MSS to avoid GSO_BY_FRAGS (0xFFFF)

In the Linux kernel, the following vulnerability has been resolved: tcp: ipv6: clamp default adverting MSS to avoid GSOBYFRAGS 0xFFFF When MTU is large, ip6defaultadvmss can return IPV6MAXPLEN 65535. This is interpreted by TCP as mssclamp, allowing the MSS to reach 65535. However, 0xFFFF is also...

Important: Red Hat Security Advisory: kernel security, bug fix, and enhancement update

An update for kernel is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

SUSE CVE-2026-63836

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tpmeter: avoid divide-by-zero for deccwnd The cwnd is always MSS = cwnd = 0x20000000. But the calculation in batadvtpupdatecwnd assumes unsigned 32 bit arithmetics. mss 8 2 / cwnd 8 In case cwnd is actually 0x20000000...

CVE-2026-63836

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tpmeter: avoid divide-by-zero for deccwnd The cwnd is always MSS = cwnd = 0x20000000. But the calculation in batadvtpupdatecwnd assumes unsigned 32 bit arithmetics. mss 8 2 / cwnd 8 In case cwnd is actually 0x20000000...

CVE-2026-63836 batman-adv: tp_meter: avoid divide-by-zero for dec_cwnd

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tpmeter: avoid divide-by-zero for deccwnd The cwnd is always MSS = cwnd = 0x20000000. But the calculation in batadvtpupdatecwnd assumes unsigned 32 bit arithmetics. mss 8 2 / cwnd 8 In case cwnd is actually 0x20000000...

CVE-2026-63836

The CVE-2026-63836 issue is in batman-adv tp_meter within the Linux kernel, caused by a 32-bit arithmetic overflow in batadv_tp_update_cwnd() that can yield a divide-by-zero when cwnd reaches 0x20000000. The correct calculation should be (mss ** 2) * 8 / cwnd to avoid overflow, preserving the 8x ...