CVE-2025-38097 — espintcp: remove encap socket caching to avoid reference leak

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

espintcp: remove encap socket caching to avoid reference leak

The current scheme for caching the encap socket can lead to reference leaks when we try to delete the netns.

The reference chain is: xfrm_state -> enacp_sk -> netns

Since the encap socket is a userspace socket, it holds a reference on the netns. If we delete the espintcp state (through flush or individual delete) before removing the netns, the reference on the socket is dropped and the netns is correctly deleted. Otherwise, the netns may not be reachable anymore (if all processes within the ns have terminated), so we cannot delete the xfrm state to drop its reference on the socket.

This patch results in a small (~2% in my tests) performance regression.

A GC-type mechanism could be added for the socket cache, to clear references if the state hasn't been used "recently", but it's a lot more complex than just not caching the socket.

USN-7769-1 — linux, linux-aws, linux-gcp, linux-gcp-6.14, linux-oracle, linux-realtime vulnerabilities

Affected: Ubuntu:24.04:LTS: linux-gcp-6.14

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM64 architecture; - PowerPC architecture; - x86 architecture; - Block layer subsystem; - Cryptographic API; - ACPI drivers; - Android drivers; - Bluetooth drivers; - Bus devices; - Clock framework and drivers; - CPU frequency scaling framework; - Hardware crypto device drivers; - DMA engine subsystem; - EDAC drivers; - Arm Firmware Framework for ARMv8-A(FFA); - FPGA Framework; - GPIO subsystem; - GPU drivers; - HID subsystem; - Hardware monitoring drivers; - HW tracing; - InfiniBand drivers; - IOMMU subsystem; - Multiple devices driver; - Media drivers; - VMware VMCI Driver; - MTD block device drivers; - Network drivers; - Mellanox network drivers; - STMicroelectronics network drivers; - NVDIMM (Non-Volatile Memory Device) drivers; - NVME drivers; - NVMEM (Non Volatile Memory) drivers; - PCI subsystem; - Amlogic Meson DDR PMU; - NI-700 PMU driver; - PHY drivers; - Pin controllers subsystem; - x86 platform drivers; - PTP clock framework; - SCSI subsystem; - ASPEED SoC drivers; - SPI subsystem; - TCM subsystem; - Thunderbolt and USB4 drivers; - TTY drivers; - UFS subsystem; - USB core drivers; - USB Gadget drivers; - Renesas USBHS Controller drivers; - USB Type-C Port Controller Manager driver;…

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CVE-2025-38097 — espintcp: remove encap socket caching to avoid reference leak

USN-7769-1 — linux, linux-aws, linux-gcp, linux-gcp-6.14, linux-oracle, linux-realtime vulnerabilities