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关于Linux内核本地提权漏洞风险预警的通知

  • 2026-07-02 16:49:09
关于Linux内核本地提权漏洞风险预警的通知

关于Linux内核本地提权

漏洞风险预警的通知

近期，Linux内核CVE-2026-31431（Copy Fail）中被披露存在一个高危的本地权限提升漏洞。攻击者利用该漏洞可以实现稳定、确定性的提权操作。受影响时间跨度长达近十年（自2017年起），且覆盖所有主流Linux发行版本。

Part 01

    风险危害       

本地权限提升：任何无特权的本地普通用户均可利用该漏洞篡改高权限进程（如 /usr/bin/su），直接获取系统最高级别的 root 权限。

Part 02

    受影响范围     

该漏洞影响内核版本在2017年8月9日至2026年3月31日之间的所有Linux系统。默认配置下启用或可按需加载 `algif_aead` 模块的系统均在受影响之列。

已知受影响的产品及版本包括但不限于

• Ubuntu 24.04 LTS 及以下版本

• RedHat Enterprise Linux (RHEL) 8 / 9 / 10 及以下版本

• Centos 8及以上版本

• OpenEuler / 统信UOS / 麒麟Kylin / 龙蜥 Anolis OS/ Debian / Arch / Fedora / Rocky / Alma / Oracle 等同期内核版本

• Amazon Linux 2023 及以下版本

• SUSE 16 及以下版本

受影响内核版本：

• 6.12 所有版本

• 6.6 所有版本

• 6.1 所有版本

• 5.15 所有版本

• 5.10 所有版本

• 4.14及以上版本

不受影响的版本

• 内核主线 7.0 及以上

• 稳定版 6.18.22 及以上

• 稳定版 6.19.12 及以上

Part 03

     排查方法       

01

内核版本自查：通过命令行执行 uname -r 查看当前内核版本，并对照官方修复的内核版本号判断是否处于受影响区间。（以此方法为准）

02

内核模块排查：检查系统是否加载或允许加载 algif_aead 模块，可执行命令：1、sudo modprobe algif_aead；2、lsmod | grep algif_aead。

Part 04

    处置与修复建议

重要提醒：请务必在修复前对系统及应用进行备份。

具体修复方法请参照《Linux内核本地提权漏洞修复方案》

http://xxh.cpu.edu.cn/a3/a5/c9461a238501/page.htm里的附件1和2。

在修复过程中如遇问题，请与信息化建设管理处联系。

联系人：张老师、叶老师  025-86185448。

  编辑：张黎萍

初审：曹雷

复审：袁泉

终审：黄艳

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  1. CONNECT:[ UseTime:0.000548s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000849s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000316s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.005293s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000649s ]
  8. SELECT * FROM `article` WHERE `id` = 494883 LIMIT 1 [ RunTime:0.000518s ]
  9. UPDATE `article` SET `lasttime` = 1783057487 WHERE `id` = 494883 [ RunTime:0.012367s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000350s ]
  11. SELECT * FROM `article` WHERE `id` < 494883 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000536s ]
  12. SELECT * FROM `article` WHERE `id` > 494883 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000435s ]
  13. SELECT * FROM `article` WHERE `id` < 494883 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000715s ]
  14. SELECT * FROM `article` WHERE `id` < 494883 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001348s ]
  15. SELECT * FROM `article` WHERE `id` < 494883 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000607s ]
0.096535s