CVE-2026-98844— netfs 文件扩展时清除 EOF 后缓存漏洞
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： netfs：通过 write 扩展文件时，清除 EOF 之后的页缓存 修复 netfs，使其能够清除由普通 write 操作在文件末尾（EOF）之后创建的“空洞”中的内容，前提是这些空洞中此前已通过内存映射（mmap）区域写入过脏数据。无论是缓冲写路径，还是非缓冲写/直接 I/O（DIO）路径，此前均未清除这些过时的页缓存。 在扩展性写操作之前，将跨越 EOF 的页框（folio）尾部清零。这是唯一可能包含通过 mmap 写入到 EOF 之后数据的页框，因为完全位于 E
可能的 ATT&CK 技术 1 AI
T1562.004影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 153a9961b551101cd38e94e26cd92fbfd198b19b< f8f7d86b3537e885ee620898a38b749fba8a8456 |
affected |
153a9961b551101cd38e94e26cd92fbfd198b19b< 98f6a4589e0f5f6cf819b8dd45605efc481c06ce |
affected | ||
153a9961b551101cd38e94e26cd92fbfd198b19b< a7036a73671fc83d299bc770710fe996d9fef9ca |
affected | ||
153a9961b551101cd38e94e26cd92fbfd198b19b< 69bf14300b50631e7c2271289d347bbd1b19a06c |
affected | ||
6.8 |
affected | ||
< 6.8 |
unaffected | ||
6.12.113≤ 6.12.* |
unaffected | ||
6.18.56≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-98844 基础信息
漏洞信息
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Vulnerability Title
netfs: clear post-EOF pagecache when extending a file via write
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
netfs: clear post-EOF pagecache when extending a file via write
Fix netfs to erase the contents of a hole created after the EOF by an
ordinary write if dirty data has been previously left there by writes
through an mmapped region. Neither the buffered nor the unbuffered/DIO
write path clears that stale pagecache.
Zero the tail of the folio straddling the EOF before an extending
write. That is the only folio that can hold data written past the EOF
through an mmap, as pages wholly beyond the EOF can't be faulted in.
The folio is zeroed rather than dropped so a concurrent extending write
can't lose data.
Both write paths downgrade the i_rwsem to shared, so extending writes
can run concurrently and the i_size read by the caller may be stale by
the time the folio is locked. Re-read i_size under the folio lock and
clamp the zeroed range up to it, so a racing write that already put
data into the folio isn't clobbered.
Wait for any writeback on the folio to finish before zeroing it so that
the pagecache isn't modified while it may still be read by the transport
during transmission. Honour IOCB_NOWAIT by returning -EAGAIN rather
than blocking on the folio lock, on writeback, or in folio_mkclean()'s
rmap walk when the folio is mapped.
truncate_pagecache() can't be used here: it must be called with the
i_rwsem held exclusively, but these write paths only hold it shared,
and it would block unconditionally, breaking IOCB_NOWAIT.
Callers that hold i_rwsem exclusively for the whole resize (truncate,
setattr, fallocate, clone) exclude any genuine concurrent buffered
writer, so staleness can instead be decided from the folio's dirty
state, as pagecache_isize_extended() already does for filesystems that
serialise writes against truncate/setattr via a single i_rwsem.
Export netfs_clear_stale_post_isize() helper to handle such case.
The helper is required by the CIFS client to fix generic/363.
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
受影响产品
二、漏洞 CVE-2026-98844 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-98844 补丁与修复 (4)
同批安全公告 · Linux · 2026-10-18 · 共 436 条
| CVE-2026-98582 | ST21NFCA NFC 驱动接收帧大小验证漏洞 | |
| CVE-2026-98568 | Linux vxlan 邻居回复内存使用漏洞 | |
| CVE-2026-98570 | Linux IPv6 子网路由表项处理信息泄露漏洞 | |
| CVE-2026-98571 | stmmac 驱动 skb 构建失败后内存泄漏漏洞 | |
| CVE-2026-98572 | bpf MIPS32 JEQ/JNE 跳转指令逻辑漏洞 | |
| CVE-2026-98573 | Linux 内核 IPv6 校验和计算整数下溢漏洞 | |
| CVE-2026-98574 | bcmgenet 网络驱动 NAPI 停止前禁用队列漏洞 | |
| CVE-2026-98575 | pn533 NFC 驱动越界读取漏洞 | |
| CVE-2026-98576 | Linux NFC LLCP 服务名日志越界读漏洞 | |
| CVE-2026-98577 | NFC LLCP 模块 WKS SAP 劫持漏洞 | |
| CVE-2026-98578 | Linux st21nfca ISO15693 库存长度验证漏洞 | |
| CVE-2026-98579 | NFC LLCP SDreq TLV 列表泄露漏洞 | |
| CVE-2026-98580 | Linux NFC LLCP 接受队列生命周期竞态条件漏洞 | |
| CVE-2026-98581 | NFC LLCP nfc_llcp_recv_dm 列表损坏/引用计数不同步 | |
| CVE-2026-98593 | Linux s390 调试功能空指针解引用漏洞 | |
| CVE-2026-98590 | bpf 上下文代码生成逻辑修复 | |
| CVE-2026-98591 | bpf skb 动态指针越界漏洞 | |
| CVE-2026-98592 | Spacemit 网络驱动传输描述符处理漏洞 | |
| CVE-2026-98589 | bpf 子程序拒绝 pkt 参数 | |
| CVE-2026-98594 | tg3 驱动 PHYLIB 资源清理漏洞 |
显示前 20 条，共 436 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-98844
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