CVE-2026-45895— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于quota操作与文件系统冻结之间的活锁问题，可能导致系统无响应。
可能的 ATT&CK 技术 1 AI
T1053 · Scheduled Task/Job影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 576215cffdefc1f0ceebffd87abb390926e6b037< 37ccd48cf35f3c8b9f2ea961a7b486b91eb71a82 |
affected |
576215cffdefc1f0ceebffd87abb390926e6b037< 414259caf81a397563fc9baca9c0ef856c4a97cf |
affected | ||
576215cffdefc1f0ceebffd87abb390926e6b037< 02bb1500f1479750e6557c8044f6a2d7e9d30c12 |
affected | ||
576215cffdefc1f0ceebffd87abb390926e6b037< 53b2314b26b6640a3657cc924de63a1a8f26ac4d |
affected | ||
576215cffdefc1f0ceebffd87abb390926e6b037< 77449e453dfc006ad738dec55374c4cbc056fd39 |
affected | ||
6.5 |
affected | ||
< 6.5 |
unaffected | ||
6.6.128≤ 6.6.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-45895 基础信息
漏洞信息
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Vulnerability Title
quota: fix livelock between quotactl and freeze_super
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
quota: fix livelock between quotactl and freeze_super
When a filesystem is frozen, quotactl_block() enters a retry loop
waiting for the filesystem to thaw. It acquires s_umount, checks the
freeze state, drops s_umount and uses sb_start_write() - sb_end_write()
pair to wait for the unfreeze.
However, this retry loop can trigger a livelock issue, specifically on
kernels with preemption disabled.
The mechanism is as follows:
1. freeze_super() sets SB_FREEZE_WRITE and calls sb_wait_write().
2. sb_wait_write() calls percpu_down_write(), which initiates
synchronize_rcu().
3. Simultaneously, quotactl_block() spins in its retry loop, immediately
executing the sb_start_write() - sb_end_write() pair.
4. Because the kernel is non-preemptible and the loop contains no
scheduling points, quotactl_block() never yields the CPU. This
prevents that CPU from reaching an RCU quiescent state.
5. synchronize_rcu() in the freezer thread waits indefinitely for the
quotactl_block() CPU to report a quiescent state.
6. quotactl_block() spins indefinitely waiting for the freezer to
advance, which it cannot do as it is blocked on the RCU sync.
This results in a hang of the freezer process and 100% CPU usage by the
quota process.
While this can occur intermittently on multi-core systems, it is
reliably reproducing on a node with the following script, running both
the freezer and the quota toggle on the same CPU:
# mkfs.ext4 -O quota /dev/sda 2g && mkdir a_mount
# mount /dev/sda -o quota,usrquota,grpquota a_mount
# taskset -c 3 bash -c "while true; do xfs_freeze -f a_mount; \
xfs_freeze -u a_mount; done" &
# taskset -c 3 bash -c "while true; do quotaon a_mount; \
quotaoff a_mount; done" &
Adding cond_resched() to the retry loop fixes the issue. It acts as an
RCU quiescent state, allowing synchronize_rcu() in percpu_down_write()
to complete.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于quota操作与文件系统冻结之间的活锁问题，可能导致系统无响应。
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
二、漏洞 CVE-2026-45895 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-45895 补丁与修复 (3)
同批安全公告 · Linux · 2026-05-27 · 共 275 条
| CVE-2026-46039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45898 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45988 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45972 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46043 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46056 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45843 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71311 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46037 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46099 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46010 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46076 | 7.9 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45956 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45861 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46036 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45959 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45862 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45894 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45935 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 275 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-45895
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