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【安全公告】Linux 内核高危本地提权漏洞 CVE-2026-31431 龙蜥已修复,请及时升级更新

  • 2026-06-30 15:07:56
【安全公告】Linux 内核高危本地提权漏洞 CVE-2026-31431 龙蜥已修复,请及时升级更新

背景

2026 年 4 月 30 日,安全研究团队公开披露了一个存在于 Linux Kernel 的高危本地权限提升漏洞,代号 "Copy Fail"(编号 CVE-2026-31431)。该漏洞由 AI 辅助安全分析工具扫描发现,是一个潜伏近十年的深层逻辑缺陷。已公开的 PoC 仅 732 字节,可在 Ubuntu、RHEL、Amazon Linux、SUSE 及龙蜥操作系统 Anolis OS 等主流发行版上稳定获取 root 权限。

漏洞详情

根因分析

该漏洞根植于 Linux 内核的algif_aead 模块(AF_ALG 加密接口的 AEAD 实现)。2017 年引入的 commit 72548b9 在 algif_aead中添加了原地(in-place)操作优化,试图将 TX SGL(发送缓冲区)的数据直接复制到 RX SGL(接收缓冲区)以节省一次内存拷贝。

原地操作有一个致命前提:source 和 destination 必须指向同一块物理内存映射。但在 algif_aead 的实际场景中,TX SGL 的数据来自用户态 sendmsg()提交的内存,而 RX SGL 的数据通过splice()指向另一块映射(如 page cache 页面、pipe buffer)。当两者来自不同映射时,in-place 复制逻辑错误地计算了偏移和长度,导致数据被写入错误的内存位置——形成对 page cache 的可控 4 字节临时写入(scratch-write)
攻击链AF_ALG socket→ algif_aead →splice() → 4-byte page cache write → 篡改 Setuid 程序内存映像 → root。
主要危害:
  • 本地提权: 攻击者可通过篡改/usr/bin/su 等 Setuid 程序在内存中的映像,直接获取 Root 权限。

  • 容器逃逸: 页缓存在宿主机范围内共享,容器内的低权限代码可影响宿主机或其他容器。

  • 隐蔽性强: 攻击仅修改内存缓存而不触碰磁盘文件,传统文件完整性校验工具无法检测。

  • 无需竞态条件: 确定性漏洞,无需竞态条件,732-byte PoC 可在所有主流发行版稳定利用。

影响的产品

经龙蜥社区安全团队评估,以下 Anolis OS 版本及内核组合受此漏洞影响:

产品版本
受影响内核版本
风险等级
建议措施
Anolis OS 7
ANCK 4.19
高危
立即更新至修复版本(ANSA-2026:0566)
Anolis OS 8
ANCK  5.10
高危
立即更新至修复版本(ANSA-2026:0565)
Anolis OS 23
ANCK 6.6
高危
立即更新至修复版本(ANSA-2026:0564)
ANSA-2026:0566(复制链接至浏览器打开)

https://anas.openanolis.cn/errata/detail/ANSA-2026:0566

ANSA-2026:0565(复制链接至浏览器打开)

https://anas.openanolis.cn/errata/detail/ANSA-2026:0565

ANSA-2026:0564(复制链接至浏览器打开)

https://anas.openanolis.cn/errata/detail/ANSA-2026:0564

修复方案

龙蜥社区已于 2026 年 5 月 2 日发布 Anolis OS 7/8/23 的官方安全修复公告 ANSA-2026:0566、ANSA-2026:0565、ANSA-2026:0564(链接见上文)。受影响用户请立即执行以下命令完成修复:

# Anolis OS 7 / 8yum update kernel# Anolis OS 23dnf update kernel

更新后重启系统以加载修复后的内核。重启后请移除所有临时缓解措施(BPF LSM、LD_PRELOAD、systemd 限制等)。

参考链接(复制链接至浏览器打开)

[1]CVE-2026-31431 - NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-31431

[2]Linux Kernel Commit a664bf3d (Fix)

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a664bf3d0a0dcf9ae47cc21e0daec706d7a5

[3]Copy Fail: 732 Bytes to Root on Every Major Linux Distribution

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

—— 完 ——

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  1. CONNECT:[ UseTime:0.000622s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000822s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000310s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000204s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000562s ]
  8. SELECT * FROM `article` WHERE `id` = 491672 LIMIT 1 [ RunTime:0.000528s ]
  9. UPDATE `article` SET `lasttime` = 1783090605 WHERE `id` = 491672 [ RunTime:0.016031s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000381s ]
  11. SELECT * FROM `article` WHERE `id` < 491672 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000590s ]
  12. SELECT * FROM `article` WHERE `id` > 491672 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000387s ]
  13. SELECT * FROM `article` WHERE `id` < 491672 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001917s ]
  14. SELECT * FROM `article` WHERE `id` < 491672 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001856s ]
  15. SELECT * FROM `article` WHERE `id` < 491672 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015497s ]
0.109200s