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【安全公告】Linux Kernel 本地权限提升漏洞(CVE-2026-31431)openEuler在维版本均已修复,请尽快升级

  • 2026-07-03 03:35:57
【安全公告】Linux Kernel 本地权限提升漏洞(CVE-2026-31431)openEuler在维版本均已修复,请尽快升级
漏洞概述

近日,Linux 内核披露本地提权漏洞 CVE-2026-31431(Copy Fail),该漏洞源于内核加密子系统中的一处逻辑缺陷,攻击者可以利用 AF_ALG 加密接口与 splice() 系统调用的组合,向任意可读文件的页缓存写入受控的4字节数据,从而篡改 setuid 程序,无需竞争条件即可直接获得 root 权限,目前该漏洞PoC和技术细节已公开。

openEuler应急响应

鉴于该漏洞影响范围较大,OpenAtom openEuler(简称 “openEuler” 或 “开源欧拉”)社区迅速开展应急响应,2026年4月30日完成对社区全部在维的版本的评估分析,并于2026年5月3日完成了4.19、5.10和6.6全系列内核版本的修复,建议客户尽快做好自查并及时应用对应的修复补丁。

漏洞分析

该漏洞的根源涉及 AF_ALG 加密接口、splice 系统调用以及具有 setuid-root 二进制文件,这三者结合导致攻击者能将恶意数据写入内核页缓存,进而篡改二进制文件,从而执行二进制文件可以触发本地提权风险。

受影响版本及修复补丁

系统版本

内核版本

是否受影响

修复补丁链接

openEuler-20.03-LTS-SP4

<=4.19.90-2604.3.0.0369

https://atomgit.com/openeuler/kernel/pull/22146

openEuler-22.03-LTS-SP4

<=5.10.0-311.0.0.214

https://atomgit.com/openeuler/kernel/pull/22139

openEuler-24.03-LTS

<=6.6.0-145.0.6.133

https://atomgit.com/openeuler/kernel/pull/22148

openEuler-24.03-LTS-SP1

<=6.6.0-145.0.6.145

https://atomgit.com/openeuler/kernel/pull/22148

openEuler-24.03-LTS-SP2

<=6.6.0-145.0.3.144

已停止维护,https://atomgit.com/openeuler/kernel/pull/22148

openEuler-24.03-LTS-SP3

<=6.6.0-145.0.6.137

https://atomgit.com/openeuler/kernel/pull/22148

修复的内核版本

各版本修复内核RPM包,可在安全公告中获取:

系统版本

修复内核版本

公告链接

openEuler-20.03-LTS-SP4

4.19.90-2605.3.0.0370

https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2174

openEuler-22.03-LTS-SP4

5.10.0-312.0.0.215

https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2175

openEuler-24.03-LTS

6.6.0-145.0.7.134

https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2176

openEuler-24.03-LTS-SP1

6.6.0-145.0.7.146

https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2172

openEuler-24.03-LTS-SP2

-

已停止维护,可升级openEuler-24.03-LTS-SP3对应的修复版本:https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2173

openEuler-24.03-LTS-SP3

6.6.0-145.0.7.138

https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2173

排查方法
  1. 内核版本自查:uname -a,确定内核是否在受影响范围:

  1. 检查内核配置是否启用:

grep CONFIG_CRYPTO_USER_API_AEAD /boot/config-$(uname -r)

CONFIG_CRYPTO_USER_API_AEAD=y:openEuler在维的版本模块已静态编译入内核,会自动加载,lsmod不可查,会受影响。

CONFIG_CRYPTO_USER_API_AEAD=m:可通过lsmod检查模块是否加载

lsmod | grep algif,若存在则受影响。

漏洞修复验证

1、升级openEuler社区已发布的修复内核版本,需使用root权限操作:

官方源在线升级:sudo dnf update kernel -y

或手动离线升级:

rpm -ivh kernel-6.6.0-145.0.7.138.oe2403sp3.aarch64.rpm

注:

以24.03-LTS-SP3版本update为例 最新内核包获取地址:

https://repo.openeuler.org/openEuler-24.03-LTS-SP3/update/aarch64/Packages/

2、更新完内核后重启系统并确认内核版本是否正确

sudo uname -a

3、验证漏洞已修复

规避措施

在无法更新修复补丁的情况下可尝试采取以下规避措施:

1. algif_aead模块禁用

`algif_aead.ko` 为 crypto 框架层提供的 socket 用户态接口,受 `CONFIG_CRYPTO_USER_API_AEAD` 控制(`=m` 时编译成模块,`=y` 是编译进内核),openEuler默认发布的内核是编译进内核的,因此禁用该模块的规避措施不可用,基于openEuler内核将此模块编译为ko的情况下可禁止此模块加载进行规避。

2. Seccomp 禁止相关 syscall

seccomp 是进程级别的控制机制,通过 seccomp 禁止进程使用带有 `AF_ALG` 标志位的 socket。适用容器场景,通过更改容器管理器(如 docker)配置,给新创建的容器增加 seccomp 规则,阻止新容器使用 `AF_ALG` socket。

本文参考链接

[1].https://copy.fail/

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

[3]引入问题补丁

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=72548b093ee38a6d4f2a19e6ef1948ae05c181f7

[4]修复问题补丁

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a664bf3d603dc3bdcf9ae47cc21e0daec706d7a

-END-

供稿 | openEuler安全委员会

编辑 | 丘云

校审 | 郑振宇、刘彦飞

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  1. CONNECT:[ UseTime:0.000951s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001269s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005863s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001098s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001250s ]
  6. SELECT * FROM `set` [ RunTime:0.001909s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001297s ]
  8. SELECT * FROM `article` WHERE `id` = 491088 LIMIT 1 [ RunTime:0.010063s ]
  9. UPDATE `article` SET `lasttime` = 1783135093 WHERE `id` = 491088 [ RunTime:0.026125s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.003482s ]
  11. SELECT * FROM `article` WHERE `id` < 491088 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000501s ]
  12. SELECT * FROM `article` WHERE `id` > 491088 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000413s ]
  13. SELECT * FROM `article` WHERE `id` < 491088 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002245s ]
  14. SELECT * FROM `article` WHERE `id` < 491088 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007857s ]
  15. SELECT * FROM `article` WHERE `id` < 491088 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.027080s ]
0.221261s