CVE-2026-98975— XFS 文件系统 reflink 标志交换逻辑漏洞
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： xfs：在交换映射时停止交换 reflink 标志 当交换操作覆盖两个文件从偏移量 0 到 的范围时， 函数假设所有映射均已移动，并将 reflink 标志移交给另一个文件。 这一假设是错误的。文件在 之后仍可能拥有共享块，例如在 操作将文件大小设置为更小值但未解除任何映射后。此时，reflink 标志会被清除，导致后续对该块的写入操作直接在原地进行，而非采用写时复制（CoW）机制，从而破坏共享该块的其他文件。 提交 （"xfs: fix exchange-range
可能的 ATT&CK 技术 1 AI
T1562.005影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f0bc4d134b46607967bda1205ce3226a1bd95f42< 1fa2f3a7ef7ee0f2503a4b0afe24bc8c9d0820be |
affected |
f0bc4d134b46607967bda1205ce3226a1bd95f42< 7d3b9b2c9dc57f93f36c716ab752548cb4db9900 |
affected | ||
f0bc4d134b46607967bda1205ce3226a1bd95f42< 4756c94260e69ce42612b8220c3614f02f7a11d5 |
affected | ||
f0bc4d134b46607967bda1205ce3226a1bd95f42< d84d6c1a7f1e2de9e601703a326a4c1b7b421943 |
affected | ||
4.9 |
affected | ||
< 4.9 |
unaffected | ||
6.12.114≤ 6.12.* |
unaffected | ||
6.18.57≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-98975 基础信息
漏洞信息
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Vulnerability Title
xfs: stop exchanging reflink flags when exchanging mappings
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
xfs: stop exchanging reflink flags when exchanging mappings
When an exchange covers both files from offset 0 to i_disk_size,
xmi_can_exchange_reflink_flags() assumes every mapping moved and hands
the reflink flag over to the other file.
That assumption is wrong. A file can still own shared blocks past
i_disk_size, e.g. after EXCHANGE_RANGE_TO_EOF sets a smaller size
without unmapping anything. The flag is cleared anyway, and the next
write to such a block happens in place instead of CoW, corrupting the
other file that shares it.
Commit a23eca88448e ("xfs: fix exchange-range reflink flag clearing
issue with INO1_WRITTEN") fixed one instance of this. Rather than add
another special case, stop moving the flags.
xfs_exchmaps_ensure_reflink() already sets the flag on both inodes
before the exchange, so both just keep it.
Nothing sets CLEAR_INO{1,2}_REFLINK anymore. Intents logged by older
kernels may still carry them; recovery already masks them off, so they
stay in the log format mask and are ignored.
XFS_IOC_SWAPEXT has the same problem: it moves the reflink flag from
one inode to the other along with the extents. Just removing that is
not enough here: the exchange path flags both inodes up front in
xfs_exchmaps_ensure_reflink(), but swapext has no such step, so the
inode receiving the shared extents would be left without the flag.
Set it on both inodes instead, and make sure both have a CoW fork,
since an inode with the reflink flag is expected to have one.
The flag now stays until FALLOC_FL_UNSHARE_RANGE, xfs_scrub, or a
truncate to zero removes it.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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-2026-98975 的公开POC
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|---|
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CVE-2026-98975 补丁与修复 (3)
同批安全公告 · Linux · 2026-10-23 · 共 218 条
| CVE-2026-98959 | 9.8 CRITICAL | btrfs 扩展属性替换处理远程代码执行漏洞 |
| CVE-2026-99079 | 9.8 CRITICAL | Mellanox mlx5e 驱动 XSK 缓冲区释放漏洞 |
| CVE-2026-99078 | 9.8 CRITICAL | Mellanox mlx5e MPWQE重试时XSK缓冲区释放漏洞 |
| CVE-2026-98870 | 8.8 HIGH | ksmbd 会话清理时存在通道移除逻辑漏洞 |
| CVE-2026-98988 | 8.8 HIGH | Linux 5.13 命名空间越界漏洞 |
| CVE-2026-99083 | 8.8 HIGH | ksmbd 的 krb5_authenticate() 函数堆越界写漏洞 |
| CVE-2026-99082 | 8.8 HIGH | KVM x86 内存管理漏洞 |
| CVE-2026-98981 | 8.8 HIGH | Linux 内核命名空间 dentry 解挂载前未哈希漏洞 |
| CVE-2026-98980 | 8.8 HIGH | namei 遍历中过度挂载条目信息泄露漏洞 |
| CVE-2026-99042 | 8.4 HIGH | io_uring 24 字节 sockaddr_in6 过滤字段填充漏洞 |
| CVE-2026-98978 | 8.4 HIGH | Linux 命名空间 锁定挂载永不失效漏洞 |
| CVE-2026-99064 | 8.1 HIGH | CIPSO 缓存选项偏移调整漏洞 |
| CVE-2026-98968 | 8.1 HIGH | AMT 中继通用查询远程代码执行漏洞 |
| CVE-2026-98889 | 7.8 HIGH | iwlwifi 驱动调度扫描 IE 大小计算漏洞 |
| CVE-2026-98991 | 7.8 HIGH | Linux 内核队列命名空间挂载通知重复漏洞 |
| CVE-2026-98944 | 7.8 HIGH | Steam HID 注册重构漏洞 |
| CVE-2026-99056 | 7.8 HIGH | strparser 解析器关闭时竞态条件漏洞 |
| CVE-2026-98999 | 7.8 HIGH | Intel Xe DRM 驱动程序链接表项失效漏洞 |
| CVE-2026-99054 | 7.8 HIGH | Linux TIPC 拓扑服务队列资源泄漏漏洞 |
| CVE-2026-99032 | 7.8 HIGH | Linux 内核 SMC 模块 信息泄露漏洞 |
显示前 20 条，共 218 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98975
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