kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()

A flaw was found in the Linux kernel's Virtual Extensible LAN VXLAN module. This vulnerability occurs because a cached IP header pointer is improperly reused after a Path Maximum Transmission Unit PMTU check. When the packet's head is modified during the PMTU check, the old cached IP header point...

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

In the Linux kernel, the following vulnerabilities have been resolved: Tunnels: Fixed an out-of-bounds access issue when building IPv6 PMTU errors. If the ICMPv6 error is generated using a non-linear skb, the following issues occur: BUG: KASAN: Out-of-bounds access in docsum+0x220/0x240 Reading o...

SUSE CVE-2026-74656

In the Linux kernel, the following vulnerability has been resolved: ipv4: fix use-after-free in fibnhcupdatemtu fibnhcupdatemtu walks the nexthop exception table under RTNL, but RTNL does not serialize this walk with PMTU exception updates. The walk uses rcudereferenceprotected with a constant tr...

CVE-2026-74656

In the Linux kernel, the following vulnerability has been resolved: ipv4: fix use-after-free in fibnhcupdatemtu fibnhcupdatemtu walks the nexthop exception table under RTNL, but RTNL does not serialize this walk with PMTU exception updates. The walk uses rcudereferenceprotected with a constant tr...

AZL-97206 CVE-2026-74656 affecting package kernel 6.6.150.1-1

In the Linux kernel, the following vulnerability has been resolved: ipv4: fix use-after-free in fibnhcupdatemtu fibnhcupdatemtu walks the nexthop exception table under RTNL, but RTNL does not serialize this walk with PMTU exception updates. The walk uses rcudereferenceprotected with a constant tr...

UBUNTU-CVE-2026-74656

In the Linux kernel, the following vulnerability has been resolved: ipv4: fix use-after-free in fibnhcupdatemtu fibnhcupdatemtu walks the nexthop exception table under RTNL, but RTNL does not serialize this walk with PMTU exception updates. The walk uses rcudereferenceprotected with a constant tr...

EUVD-2026-64593

In the Linux kernel, the following vulnerability has been resolved: ipv4: fix use-after-free in fibnhcupdatemtu fibnhcupdatemtu walks the nexthop exception table under RTNL, but RTNL does not serialize this walk with PMTU exception updates. The walk uses rcudereferenceprotected with a constant tr...

Linux Distros Unpatched Vulnerability : CVE-2026-74656

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - ipv4: fix use-after-free in fibnhcupdatemtu fibnhcupdatemtu walks the nexthop exception table under RTNL, but RTNL does not serialize this walk with PMTU...

Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099727)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-099727 advisory. In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached iphdr value after skbtunnelcheckpmtu skbtunnelcheckpmtu can change...

PT-2026-72507

In the Linux kernel, the following vulnerability has been resolved: ipvs: ensure inner headers in ICMP errors are in headroom Sashiko points out that after stripping the outer headers with pskb pull we should ensure the inner IP headers in ICMP errors from tunnels are present in the skb headroom...

SUSE CVE-2026-63993

In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached iphdr value after skbtunnelcheckpmtu skbtunnelcheckpmtu can change skb-head. Reusing oldiph afer skbtunnelcheckpmtu can cause an UAF. Use instead iphdrskb as done in drivers/net/bareudp.c and...

Linux Distros Unpatched Vulnerability : CVE-2026-63993

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - vxlan: do not reuse cached iphdr value after skbtunnelcheckpmtu skbtunnelcheckpmtu can change skb-head. Reusing oldiph afer skbtunnelcheckpmtu can cause an UAF...

EUVD-2026-45566

In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached iphdr value after skbtunnelcheckpmtu skbtunnelcheckpmtu can change skb-head. Reusing oldiph afer skbtunnelcheckpmtu can cause an UAF. Use instead iphdrskb as done in drivers/net/bareudp.c and...

PT-2026-61310

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A Use-After-Free UAF issue exists in the vxlan component. The problem occurs when a cached ip hdr value is reused after the skb tunnel check pmtu function is called, as this function can...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-006928)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-006928 advisory. In the Linux kernel, the following vulnerability has been resolved: tunnels: fix kasan splat when generating ipv4 pmtu error If we try to emit an icmp error in...

CVE-2001-1554

IBM AIX 430 does not properly unlock IPPMTULOCK, which allows remote attackers to cause a denial of service hang via Path Maximum Transmit Unit PMTU IP packets...

EUVD-2000-0094

Malware in sbrugna...

EUVD-2005-1195

Malware in sbrugna...

Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987184)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-987184 advisory. In the Linux kernel, the following vulnerability has been resolved: ip: Fix data-races around sysctlipfwdusepmtu. While reading sysctlipfwdusepmtu, it can be changed...

SUSE CVE-2023-53600

In the Linux kernel, the following vulnerability has been resolved: tunnels: fix kasan splat when generating ipv4 pmtu error If we try to emit an icmp error in response to a nonliner skb, we get BUG: KASAN: slab-out-of-bounds in ipcomputecsum+0x134/0x220 Read of size 4 at addr ffff88811c50db00 by...