CVE-2026-90042— Ceph 虚拟内存分配缓冲区文件名解密漏洞
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。
在 Linux 内核中，以下漏洞已得到修复： ceph：正确解密位于 vmalloc() 缓冲区中的文件名 fscrypt 子系统使用分散列表（scatterlist）加密 API，因此继承了其要求：所有传入的缓冲区必须位于线性映射区域。然而，messenger 客户端使用 kvmalloc() 为消息创建缓冲区，当物理内存碎片化导致无法通过 kmalloc() 分配足够大的连续内存时，这些缓冲区偶尔会被放置在 vmalloc() 区域。 的各调用方直接传递来自 MDS 的原始消息（或其片段），却未考虑这些消息可能
可能的 ATT&CK 技术 1 AI
T1213 · Data from Information Repositories影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 457117f077c6749d1e28469eae91fb69c9806768< 93729594af506557a86f8b603be7ac5f3370eeca |
affected |
457117f077c6749d1e28469eae91fb69c9806768< 110747ff535e3d98ac17d68dbd056bb6ef000e23 |
affected | ||
457117f077c6749d1e28469eae91fb69c9806768< 3b467c68803d7c7e82678289e598afd44faa6101 |
affected | ||
457117f077c6749d1e28469eae91fb69c9806768< e939fc6a7bd969a58a150b7f188c1047138403e3 |
affected | ||
6.6 |
affected | ||
< 6.6 |
unaffected | ||
6.12.111≤ 6.12.* |
unaffected | ||
6.18.51≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-90042 基础信息
漏洞信息
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Vulnerability Title
ceph: properly decrypt filenames in vmalloc() buffers
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ceph: properly decrypt filenames in vmalloc() buffers
The fscrypt subsystem uses the scatterlist crypto API, inheriting its
requirement that any buffers are in the linear mapping region. However,
the messenger client uses kvmalloc() to create buffers for messages,
which will occasionally place those buffers in the vmalloc() region when
physical memory fragmentation doesn't permit a large enough kmalloc().
The various callers of ceph_fname_to_usr() directly pass (slices of) raw
messages from the MDS without considering that the messages may be in
vmalloc() buffers, resulting in oopses especially on non-x86 platforms
(see 'Closes:' for more details and a reproducer).
Make ceph_fname_to_usr() explicitly tolerant of vmalloc()-allocated
fname->ctext, fname->name, and/or oname->name buffers, using `tname`
(which, when non-null, must be a linear address; when null, is briefly
allocated as necessary) as a bounce buffer to avoid passing any
inappropriate addresses to fscrypt_fname_disk_to_usr().
Additionally change parse_reply_info_readdir() -- the only function to
supply its own `tname` -- to follow the new "tname must never come from
vmalloc()" rule by passing NULL when the message is not in the linear
region. Though this causes a per-dentry kmalloc()+kfree(), this overhead
exists only when processing the minority of messages that spill into
vmalloc(). My (crude) testing puts this at only about 1 in 8,000 readdir
messages. Still, if the overhead proves unreasonable in the future, it
is easy enough to mitigate: a future change could allocate a bounce
buffer in parse_reply_info_readdir() and use that as `tname` instead.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-90042 的公开POC
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CVE-2026-90042 其他参考 (4)
同批安全公告 · Linux · 2026-09-16 · 共 276 条
| CVE-2026-90048 | 9.8 CRITICAL | Linux内核NTFS3文件系统越界写漏洞 |
| CVE-2026-89778 | 9.8 CRITICAL | isofs 空 zisofs 块页面数组越界访问漏洞 |
| CVE-2026-89783 | 9.8 CRITICAL | Linux内核 xfrm6 越界写入漏洞 |
| CVE-2026-90012 | 9.8 CRITICAL | SPI DMA映射所有权修复 |
| CVE-2026-89788 | 9.8 CRITICAL | Linux kernel ksmbd 释放后使用漏洞 |
| CVE-2026-90037 | 9.8 CRITICAL | Linux内核NFSD close_lru释放后使用漏洞 |
| CVE-2026-90038 | 9.8 CRITICAL | Linux内核NFSD导出撤销后使用漏洞 |
| CVE-2026-90036 | 9.8 CRITICAL | Linux NFSd 阻塞锁收割时释放后使用漏洞 |
| CVE-2026-89970 | 9.8 CRITICAL | NVM Target SQ拆除时超时工作未同步 |
| CVE-2026-89990 | 9.8 CRITICAL | Ceph ceph_mds_check_access 互斥锁缺失漏洞 |
| CVE-2026-89972 | 9.8 CRITICAL | NVMe驱动错误路径SRCU宽限期缺失漏洞 |
| CVE-2026-89857 | 9.8 CRITICAL | QLogic qla2xxx NVMe LS拒绝竞态条件漏洞 |
| CVE-2026-89847 | 9.8 CRITICAL | qla2xxx SCSI驱动异步IOCB超时双重完成漏洞 |
| CVE-2026-89969 | 9.8 CRITICAL | Linux内核 nvmet-tcp 越界写入漏洞 |
| CVE-2026-89930 | 9.3 CRITICAL | KVM嵌套虚拟化本地TLB刷新漏洞 |
| CVE-2026-89918 | 9.3 CRITICAL | KVM arm64 TLBI失效处理漏洞 |
| CVE-2026-89916 | 9.3 CRITICAL | KVM arm64 VNCR失效重试漏洞 |
| CVE-2026-89914 | 9.3 CRITICAL | KVM arm64 虚拟地址符号扩展错误 |
| CVE-2026-89915 | 9.3 CRITICAL | KVM arm64 移除虚拟机级 VNCR 映射计数器 |
| CVE-2026-89775 | 9.3 CRITICAL | KVM arm64 VNCR TLB大小计算漏洞 |
显示前 20 条，共 276 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-90042
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