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【安多多预警】Linux 本地提权漏洞预警Copy Fail,附影响范围和缓解措施

  • 2026-07-03 09:39:50
【安多多预警】Linux 本地提权漏洞预警Copy Fail,附影响范围和缓解措施

一句话概述:任何能登录 Linux 服务器的普通用户,运行一段不到 1KB 的 Python 脚本,几秒内即可获得 root 权限。利用成功率 100%,不会导致系统崩溃。该漏洞自 2017 年存在至今,PoC 已于 4 月 29 日公开。安多多已经成功复现并支持用户处置。

概述

2026-04-29,Theori 研究员 Taeyang Lee 公开披露该漏洞,并发布 732 字节 Python PoC。

漏洞位于内核 crypto/algif_aead.c,根源是 authencesn AEAD 模板的直线逻辑缺陷。攻击者仅需低权限本地账户即可 100% 确定性提权至 root — 无竞争条件、无内核偏移、无崩溃。

利用链路

// 1. 创建 AF_ALG socketsocket(38, SOCK_SEQPACKET, 0)

// 2. 绑定有漏洞的 AEAD 算法bind("aead""authencesn(hmac(sha256),cbc(aes))")

// 3. sendmsg 携带 payload + splice 目标文件 page cachesendmsg(AAD[4:7] = payload) + splice(target_fd)

// 4. recv 触发解密 → 4 字节写入 page cacherecv() → scatterwalk_map_and_copy → kmap_local_page

// 5. 执行被篡改的 SUID binaryexecve("/usr/bin/su") → root

攻击者完全控制:写入目标(任何可读文件)、写入偏移(splice offset + assoclen)、写入值(AAD bytes 4-7)。每次 4 字节,多次调用注入完整 shellcode。PoC 仅需 Python 3.10+ 标准库。

根本原因

漏洞由三个独立改动在交叉点上形成:

2011a5079d084f8b — authencesn 加入内核,使用 dst scatterlist 作为临时空间,当时无害。

2015104880a6b470 — 转换为新 AEAD 接口,引入 assoclen+cryptlen 越界写。AF_ALG 此时 out-of-place,尚不可利用。

201772548b093ee3 — 漏洞引入。algif_aead 增加 in-place 优化(req->src = req->dst),splice() 传入的 page cache 页面进入可写目标 scatterlist。

关键代码路径 — crypto_authenc_esn_decrypt()

// 读取 AAD[0:7]scatterwalk_map_and_copy(tmp, dst, 080);// 写回 seqno_hi 到 dst[4:7]scatterwalk_map_and_copy(tmp, dst, 441);// VULNERABLE: seqno_lo 写到 dst[assoclen+cryptlen]// 越过 AEAD 输出边界 → 直接写入 page cache 页面scatterwalk_map_and_copy(tmp+1, dst, assoclen+cryptlen, 41);

被写入的页面永远不会标记为 dirty,磁盘文件不变 — 传统文件完整性工具无法检测。

影响范围

引入 commit 72548b093ee3 (2017)

修复 commit a664bf3d603d (2026-04-01)

范围 所有 2017 年以来构建的 Linux 内核

经 Theori 实测确认:

发行版
内核版本
状态
Ubuntu 24.04 LTS
6.17.0-1007-aws
已确认
Amazon Linux 2023
6.18.8-9.213.amzn2023
已确认
RHEL 14.3
6.12.0-124.45.1.el10_1
已确认
SUSE 16
6.12.0-160000.9-default
已确认

经安多多确认受影响(内核在漏洞窗口内):

发行版
典型内核
TencentOS Server 3.x
4.18 / 5.4
TencentOS Server 4
6.6 LTS

openEuler 22.03 / 24.03

5.10 / 6.6

Alibaba Cloud Linux 3 / 4

5.10 / 6.6

OpenCloudOS
5.4 / 6.6
CentOS 8 / Stream
4.18 / 5.14
RHEL 8 / 9
4.18 / 5.14
Debian 10 / 11 / 12
4.19 / 5.10 / 6.1
Ubuntu 20.04 / 22.04
5.4 / 5.15 / 6.x

Amazon Linux 2023

6.18

SUSE 15 / 16

5.14 / 6.12

CentOS 7(内核 3.10)和 FreeBSD 不受影响。Page cache 跨容器共享,该漏洞可作为容器逃逸原语。

与历史漏洞对比

漏洞
机制
可靠性
Dirty COW (2016)
VM COW 竞争条件
需多次尝试,可能崩溃
Dirty Pipe (2022)
Pipe buffer 操纵
版本相关,需精确操纵
Copy Fail (2026)
直线逻辑缺陷
确定性,无竞争,无崩溃

风险评估

场景
影响
多租户服务器
任意用户 → root,完全控制宿主机
K8s / 容器环境
容器逃逸,跨租户攻击,page cache 由宿主内核管理,攻击者从容器内部即可利用此漏洞提权至宿主 root。Kubernetes 多租户环境需特别关注。
CI/CD 构建环境
恶意 PR → Runner 提权 → 供应链攻击
云 SaaS
租户代码 → 宿主机 root

修复建议

1. 升级内核(等待官方方案)

修复将 algif_aead 恢复为 out-of-place 操作,彻底移除 2017 年 in-place 优化。

Fix commit: a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5Fixes: 72548b093ee3 (2017)合入: 2026-04-01 mainline状态: 各发行版补丁陆续推送中

// algif_aead.c — the fix- aead_request_set_crypt(&req, rsgl_src, rsgl_src, ...); // in-place+ aead_request_set_crypt(&req, tsgl_src, rsgl_src, ...); // out-of-place

2. 临时缓解(无法立即升级,无需重启)

注意:截至 2026 年 4 月 30 日,国内各云厂商(腾讯云、阿里云、华为云)均未发布针对此漏洞的内核补丁。请先执行临时缓解方案。

# 禁止模块加载echo "install algif_aead /bin/false" | sudo tee /etc/modprobe.d/disable-algif.conf

cat /etc/modprobe.d/disable-algif.conf

# 卸载已加载模块rmmod algif_aead 2>/dev/null || true

# 验证lsmod | grep algif_aead

3. 容器环境加固

通过 seccomp 禁止 AF_ALG socket 创建(family=38):

"syscalls": [{  "names": ["socket"],  "action""SCMP_ACT_ERRNO",  "args": [{"index": 0, "value": 38, "op""SCMP_CMP_EQ"}]}]

禁用 algif_aead 不影响 dm-crypt、kTLS、IPsec、SSH、OpenSSL/GnuTLS 等常规加密功能。仅影响显式启用 AF_ALG afalg engine 的极少数场景,受影响路径自动回退用户态加密库。

自查

# 内核版本uname -r

# 内核配置是否启用grep CONFIG_CRYPTO_USER_API_AEAD /boot/config-$(uname -r)

# 模块是否已加载lsmod | grep algif

# AF_ALG socket 是否可创建python3 -c "import socket; socket.socket(38,5,0); print('VULNERABLE')"

时间线

2017 — 漏洞引入(commit 72548b093ee3)

2026-03-23 — 报告至 Linux 内核安全团队

2026-03-24 — 收到确认

2026-03-25 — 补丁审查通过

2026-04-01 — 修复合入主线

2026-04-22 — CVE-2026-31431 分配

2026-04-29 — 公开披露(copy.fail)

2026-04-30 — 本预警发布

参考

https://copy.fail

https://xint.io/blog/copy-fail-linux-distributions

https://github.com/theori-io/copy-fail-CVE-2026-31431

https://github.com/torvalds/linux/commit/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5

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  1. CONNECT:[ UseTime:0.000363s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000560s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001774s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000322s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000554s ]
  6. SELECT * FROM `set` [ RunTime:0.001732s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000694s ]
  8. SELECT * FROM `article` WHERE `id` = 490523 LIMIT 1 [ RunTime:0.000725s ]
  9. UPDATE `article` SET `lasttime` = 1783095217 WHERE `id` = 490523 [ RunTime:0.041101s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.002362s ]
  11. SELECT * FROM `article` WHERE `id` < 490523 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.021713s ]
  12. SELECT * FROM `article` WHERE `id` > 490523 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.032300s ]
  13. SELECT * FROM `article` WHERE `id` < 490523 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014670s ]
  14. SELECT * FROM `article` WHERE `id` < 490523 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.082118s ]
  15. SELECT * FROM `article` WHERE `id` < 490523 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.024988s ]
0.299774s