block-copyfail

摘要 CVE-2026-31431（“Copy Fail”）是 Linux 内核 algifaead 加密接口中的一个权限提升漏洞。攻击者利用 AFALG 套接字配合 authencesn 算法和 splice 来破坏内核页缓存中的任意文件——包括 /usr/bin/su 等 setuid 二进制文件。 本文档提供了一种零重启修复方案 ，使用 BPF LSM DaemonSet 阻止所有 AFALG AEAD 绑定——即 Copy Fail 所利用的子系统。这可以防止通过加密模板嵌套（例如 pcryptauthencesn...）进行绕过。其他 AFALG...

copy-fail-blocker

copy-fail-blocker 针对 CVE-2026-31431（“Copy Fail”）及 Dirty Frag 的 RxRPC 变体的 BPF-LSM 缓解方案，同时适用于依赖用户态访问内核侧就地加密路径（可通过 AFALG 或 AFRXRPC 套接字族访问）的类似权限提升漏洞。 一个小型 DaemonSet 在每个节点上将一个 BPF-LSM 程序附加到 socketcreate 钩子。该程序对任何用户态 socketAFALG, ... 或 socketAFRXRPC, ... 调用返回 -EPERM，无论进程能力、命名空间或 seccomp 配置文件如何。内核内部的...

block-copyfail

block-copyfail 概念验证 针对 CVE-2026-31431（“Copy Fail”）的运行时缓解方案——一种通过 algifaead 中的 authencesn 加密模板实现的 Linux 内核权限提升漏洞。 与模块黑名单不同，此方案无需重启 。一个 BPF LSM 程序挂接 socketbind 并阻止所有 AFALG AEAD 绑定——即 Copy Fail 所利用的子系统。这可以防止通过加密模板嵌套（例如 pcryptauthencesn...）实现的绕过。其他 AFALG 用法（hash、skcipher）不受影响。 被阻止的尝试会实时记录，包含...

deny-af-alg-bpf

deny-af-alg-bpf 描述 一个 BPF LSM 程序，用于阻止 AFALG（Linux 内核加密 API）套接字的创建，并通过环形缓冲区将所有尝试记录到用户空间。 功能 挂载到 lsm/socketcreate 钩子 以 -EPERM 拒绝任何 socketAFALG, ... 调用 将结构化事件（pid、comm）发送到 BPF 环形缓冲区 用户空间守护进程读取环形缓冲区并记录到 stderr（由 systemd journal 收集） 组件 程序 denyafalg.bpf.c - 主要阻止逻辑，在 BPF（内核空间）中运行 denyafalg.user.c -...

Important: kernel

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADDADDR rtx: always decrease sk refcount CVE-2026-46158 In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADDADDR rtx: free sk if last CVE-2026-46170 In the Linux kernel, th...

CVE-2026-80669

A flaw was found in the Linux kernel. A local attacker with the ability to load BPF Berkeley Packet Filter LSM Linux Security Module programs could exploit a vulnerability in the xfrmdecodesession hook. This could lead to a system panic, resulting in a Denial of Service DoS...

Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-2071)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2071 advisory. In the Linux kernel, the following vulnerability has been resolved: afunix: Drop all SCM attributes for SOCKMAP. CVE-2026-53005 In the Linux kernel, the following vulnerability has been...

Important: kernel6.18

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: afunix: Drop all SCM attributes for SOCKMAP. CVE-2026-53005 In the Linux kernel, the following vulnerability has been resolved: netfs: Fix missing locking around retry adding new subreqs CVE-2026-64068 In the Linu...

CVE-2026-80669

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable xfrmdecodesession hook attachment BPF LSM programs can currently attach to xfrmdecodesession. That hook may return an error, but securityskbclassifyflow calls it from a void path and triggers BUGON if an error is...

UBUNTU-CVE-2026-80669

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable xfrmdecodesession hook attachment BPF LSM programs can currently attach to xfrmdecodesession. That hook may return an error, but securityskbclassifyflow calls it from a void path and triggers BUGON if an error is...

CVE-2026-80669

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable xfrmdecodesession hook attachment BPF LSM programs can currently attach to xfrmdecodesession. That hook may return an error, but securityskbclassifyflow calls it from a void path and triggers BUGON if an error is...

EUVD-2026-67545

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable xfrmdecodesession hook attachment BPF LSM programs can currently attach to xfrmdecodesession. That hook may return an error, but securityskbclassifyflow calls it from a void path and triggers BUGON if an error is...

CVE-2026-80669

This Linux kernel vulnerability affects the interaction between BPF LSM programs and the xfrm_decode_session() hook. BPF LSM programs can attach to this hook, which may return an error. However, security_skb_classify_flow() invokes the hook from a void path and triggers a BUG_ON() if an error is ...

CVE-2026-80669 bpf: Disable xfrm_decode_session hook attachment

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable xfrmdecodesession hook attachment BPF LSM programs can currently attach to xfrmdecodesession. That hook may return an error, but securityskbclassifyflow calls it from a void path and triggers BUGON if an error is...

Linux Distros Unpatched Vulnerability : CVE-2026-80669

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - bpf: Disable xfrmdecodesession hook attachment BPF LSM programs can currently attach to xfrmdecodesession. That hook may return an error, but...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098979)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098979 advisory. In the Linux kernel, the following vulnerability has been resolved: bpf: Prevent tail call between progs attached to different hooks bpf progs can be attached to...

SUSE CVE-2026-63865

In the Linux kernel, the following vulnerability has been resolved: bpf: Drop tasktoinode and inetconnestablished from lsm sleepable hooks bpflsmtasktoinode is called under rcureadlock and bpflsminetconnestablished is called from softirq context, so neither hook can be used by sleepable LSM...

CVE-2026-64192

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject BPFMAPTYPEINODESTORAGE creation if BPF LSM is uninitialized When CONFIGBPFLSM=y is set, BPF inode storage maps BPFMAPTYPEINODESTORAGE are compiled into the kernel. However, if the BPF LSM is not explicitly enabled at...

CVE-2026-64192 bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject BPFMAPTYPEINODESTORAGE creation if BPF LSM is uninitialized When CONFIGBPFLSM=y is set, BPF inode storage maps BPFMAPTYPEINODESTORAGE are compiled into the kernel. However, if the BPF LSM is not explicitly enabled at...

CVE-2026-64192

CVE-2026-64192 affects the Linux kernel (BPF inode storage maps). When CONFIG_BPF_LSM=y and the BPF LSM is not enabled at boot, lsm_prepare() doesn’t run, so the BPF LSM blob size (lbs_inode) remains at the compiled default (8 bytes) instead of a larger offset. This lets a privileged user create/...