CVE-2026-52940

CVE-2026-52940 affects the Linux kernel tun module. In tun_put_user(), an on-stack struct virtio_net_hdr_v1_hash_tunnel is declared but not zeroed; for non-tunnel skbs, virtio_net_hdr_tnl_from_skb() initializes only the first 10 bytes of the 24-byte header, leaving bytes 10–23 as stack garbage. I...

Linux Distros Unpatched Vulnerability : CVE-2026-31700

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - net/packet: fix TOCTOU race on mmap'd vnethdr in tpacketsnd In tpacketsnd, when PACKETVNETHDR is enabled, vnethdr points directly into the mmap'd TX ring buffer...

CVE-2026-31700

In the Linux kernel, the following vulnerability has been resolved: net/packet: fix TOCTOU race on mmap'd vnethdr in tpacketsnd In tpacketsnd, when PACKETVNETHDR is enabled, vnethdr points directly into the mmap'd TX ring buffer shared with userspace. The kernel validates the header via...

CVE-2026-31700 net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd()

In the Linux kernel, the following vulnerability has been resolved: net/packet: fix TOCTOU race on mmap'd vnethdr in tpacketsnd In tpacketsnd, when PACKETVNETHDR is enabled, vnethdr points directly into the mmap'd TX ring buffer shared with userspace. The kernel validates the header via...

CVE-2026-31700

In the Linux kernel, the following vulnerability has been resolved: net/packet: fix TOCTOU race on mmap'd vnethdr in tpacketsnd In tpacketsnd, when PACKETVNETHDR is enabled, vnethdr points directly into the mmap'd TX ring buffer shared with userspace. The kernel validates the header via...

CVE-2026-31700

In the Linux kernel, the following vulnerability has been resolved: net/packet: fix TOCTOU race on mmap'd vnethdr in tpacketsnd In tpacketsnd, when PACKETVNETHDR is enabled, vnethdr points directly into the mmap'd TX ring buffer shared with userspace. The kernel validates the header via...

Linux kernel 安全漏洞

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 a TOCTOU race condition in the tpacketsnd function’s mmap d vnethdr operation. This vulnerability...

PT-2026-36330

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A Time-of-Check to Time-of-Use TOCTOU race condition exists in the tpacket snd function when PACKET VNET HDR is enabled. The vnet hdr points to a memory-mapped TX ring buffer shared with...