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CVE-2026-68132— Linux kernel 安全漏洞

一分钟漏洞结论

影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于紧急解冻过程中do_thaw_all_callback()在持有sb->s_umount锁时调用bdev_thaw()，导致自身死锁，可能影响文件系统和块设备的后续卸载、冻结或解冻操作。

AI 预测 5.9 利用难度: 中等 EPSS 0.18% · P8

可能的 ATT&CK 技术 1 AI

T1499 · Endpoint Denial of Service

影响版本矩阵 18

厂商产品 版本范围状态
Linux Linux 08fdc8a0138afaf324296a342f32ad26ec465e43< 96248aeddde794227a49af1a332a1e21b3c15d56 affected
08fdc8a0138afaf324296a342f32ad26ec465e43< c202aa03388fd1889b7aa4f7d677c49e22cd9700 affected
08fdc8a0138afaf324296a342f32ad26ec465e43< 2a1127c1c58b4f15a93f2fd56ff7c2c3d611d5c5 affected
08fdc8a0138afaf324296a342f32ad26ec465e43< 05536cad35f27b520d4b6f0e57c8cc5bfb6b0502 affected
08fdc8a0138afaf324296a342f32ad26ec465e43< 99719b5da9320ed344daee87d9c73d321a98f252 affected
08fdc8a0138afaf324296a342f32ad26ec465e43< 63d78b546eefc38ad9898dc839bfc94811ede547 affected
08fdc8a0138afaf324296a342f32ad26ec465e43< 4c483644d1a7709efe7d1be7dbf88cf4008a7864 affected
08fdc8a0138afaf324296a342f32ad26ec465e43< 749d7aa0377aae32af8c0a4ad43371e7bf830ab5 affected
… +10 条更多
获取后续新漏洞提醒 登录后订阅

一、 漏洞 CVE-2026-68132 基础信息

漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
super: fix emergency thaw deadlock on frozen block devices
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: super: fix emergency thaw deadlock on frozen block devices do_thaw_all_callback() calls bdev_thaw() while holding sb->s_umount exclusively. If the block device was frozen via bdev_freeze() dropping the last block layer freeze reference calls fs_bdev_thaw() which reacquires s_umount: do_thaw_all_callback(sb) super_lock_excl(sb) # holds sb->s_umount bdev_thaw(sb->s_bdev) mutex_lock(&bdev->bd_fsfreeze_mutex) # bd_fsfreeze_count drops 1 -> 0 bd_holder_ops->thaw == fs_bdev_thaw get_bdev_super(bdev) bdev_super_lock(bdev, true) super_lock(sb, true) down_write(&sb->s_umount) # same task: deadlock The emergency thaw worker deadlocks against itself holding both s_umount and bd_fsfreeze_mutex. That fscks any subsequent unmount, freeze, or thaw of that filesystem and block device. [ 81.878470] sysrq: Show Blocked State [ 81.880140] task:kworker/0:1 state:D stack:0 pid:11 tgid:11 ppid:2 task_flags:0x4208060 flags:0x00080000 [ 81.884876] Workqueue: events do_thaw_all [ 81.886656] Call Trace: [ 81.887759] <TASK> [ 81.888763] __schedule+0x579/0x1420 [ 81.890372] schedule+0x3a/0x100 [ 81.891794] schedule_preempt_disabled+0x15/0x30 [ 81.893848] rwsem_down_write_slowpath+0x1ea/0x900 [ 81.895191] ? __pfx_do_thaw_all_callback+0x10/0x10 [ 81.896528] down_write+0xbd/0xc0 [ 81.897505] super_lock+0x91/0x180 [ 81.898457] ? __mutex_lock+0xa99/0x1140 [ 81.900748] ? __mutex_unlock_slowpath+0x1f/0x400 [ 81.902069] bdev_super_lock+0x5b/0x150 [ 81.903132] get_bdev_super+0x10/0x60 [ 81.904042] fs_bdev_thaw+0x23/0xf0 [ 81.904755] bdev_thaw+0x82/0x100 [ 81.905484] do_thaw_all_callback+0x2c/0x50 [ 81.906298] __iterate_supers+0x5d/0x130 [ 81.907067] do_thaw_all+0x20/0x40 [ 81.907739] process_one_work+0x206/0x5e0 [ 81.908545] worker_thread+0x1e2/0x3c0 [ 81.909339] ? __pfx_worker_thread+0x10/0x10 [ 81.910171] kthread+0xf4/0x130 [ 81.910799] ? __pfx_kthread+0x10/0x10 [ 81.911528] ret_from_fork+0x2e2/0x3b0 [ 81.912259] ? __pfx_kthread+0x10/0x10 [ 81.913010] ret_from_fork_asm+0x1a/0x30 [ 81.913806] </TASK> bdev_super_lock() even documents the violated requirement with lockdep_assert_not_held(&sb->s_umount). Acquiring bd_fsfreeze_mutex under s_umount also inverts the bd_fsfreeze_mutex vs. s_umount ordering established by bdev_{freeze,thaw}() and can thus ABBA against a concurrent block-layer freeze even when the recursive path isn't hit. Fix this by not holding s_umount around the bdev_thaw() loop at all. Pin the superblock with an active reference instead as filesystems_freeze_callback() does. The active reference keeps the superblock from being shut down and so ->s_bdev stays valid without holding s_umount. The block-layer-held freeze is dropped by fs_bdev_thaw() with FREEZE_MAY_NEST | FREEZE_HOLDER_USERSPACE exactly as a regular unfreeze would and thaw_super_locked() handles filesystem-level freezes as before. The emergency thaw path has deadlocked like this in one form or another for a long long time but the current exclusively-held shape dates back to commit [1] where thaw_bdev() already ended in thaw_super() with s_umount held by do_thaw_all_callback().
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于紧急解冻过程中do_thaw_all_callback()在持有sb->s_umount锁时调用bdev_thaw()，导致自身死锁，可能影响文件系统和块设备的后续卸载、冻结或解冻操作。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
Linux Linux 08fdc8a0138afaf324296a342f32ad26ec465e43 ~ 96248aeddde794227a49af1a332a1e21b3c15d56 -
Linux Linux 4.17 -

二、漏洞 CVE-2026-68132 的公开POC

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三、漏洞 CVE-2026-68132 的情报信息

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CVE-2026-68132 补丁与修复 (8)

同批安全公告 · Linux · 2026-08-10 · 共 344 条

CVE-2026-68159 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68381 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68385 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68388 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68117 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68170 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68161 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68123 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68160 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68127 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68144 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68137 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68302 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68300 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68426 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68136 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68154 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68158 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68156 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68124 9.6 CRITICAL Linux kernel 安全漏洞

显示前 20 条，共 344 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68132

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