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CVE-2026-99111— smb: client: fix data corruption with concurrent writes and O_TRUNC

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： smb: 客户端：修复并发写入与 O_TRUNC 操作导致的数据损坏问题 cifs_do_truncate() 函数会通过 filemap_write_and_wait() 刷新脏页，并在服务器上截断文件。但在旧代码中，这两项操作均未持有 i_rwsem 或 invalidate_lock。此时，若通过 netfs_perform_write() 执行并发缓冲写入（该操作仅需共享模式的 i_rwsem），则可能在刷新完成之后、本地截断之前脏化新的页面；而这些新页面随后会

AI Predicted 6.5 Difficulty: Moderate Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1070 · Indicator Removal T1562

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`110fee6b9bb58a5c50047fc2594d415f741b591e< 4d143608a0445443a85c9b29f4c9f8e63d5dbfc9`	affected
		`110fee6b9bb58a5c50047fc2594d415f741b591e< ffa66fdc7d35b890606767c4d2c7ac26b4d90a99`	affected
		`110fee6b9bb58a5c50047fc2594d415f741b591e< a8603b52b39f520ea8a34def74c23fba87396d3e`	affected
		`6.18`	affected
		`< 6.18`	unaffected
		`6.18.59≤ 6.18.*`	unaffected
		`7.2.13≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

Updated Oct 28, 2026

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Vulnerability Information

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Vulnerability Title

smb: client: fix data corruption with concurrent writes and O_TRUNC

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix data corruption with concurrent writes and O_TRUNC cifs_do_truncate() flushes dirty pages with filemap_write_and_wait() and truncates the file on the server, but in the old code both operations ran without holding i_rwsem or invalidate_lock. A concurrent buffered write via netfs_perform_write() -- which only needs i_rwsem shared -- could dirty new pages after the flush but before the local truncation, and those pages would be silently discarded by cifs_setsize() -> truncate_pagecache(). Fix by acquiring inode_lock (exclusive i_rwsem) and filemap_invalidate_lock at the top of cifs_do_truncate(), so the entire flush-truncate-resize sequence is atomic with respect to: - buffered writes (blocked by exclusive i_rwsem, since netfs_start_io_write takes i_rwsem shared), - read page faults (blocked by exclusive invalidate_lock, since filemap_fault takes it shared), - writeback collection (blocked by netfs_wb_begin/netfs_wb_end around the server truncate and local resize, since netfs_writepages also acquires the wb lock).

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	110fee6b9bb58a5c50047fc2594d415f741b591e ~ 4d143608a0445443a85c9b29f4c9f8e63d5dbfc9	-
Linux	Linux	6.18	-

II. Public POCs for CVE-2026-99111

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99111

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Patches & Fixes for CVE-2026-99111 (3)

https://www.cve.org/CVERecord?id=CVE-2026-99111

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99144		sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue
CVE-2026-99130		io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131		xfs: fix capability check in xfs
CVE-2026-99133		net/iucv: fix the recvmsg window update
CVE-2026-99132		xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134		mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135		dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137		cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136		dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140		tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141		tracing: Fix crash in print_graph_function_event()
CVE-2026-99142		tracing: Check operator stack capacity before pushing
CVE-2026-99143		tracing: Keep the predicate limit separate from program capacity
CVE-2026-99156		scsi: st: Fix use-after-free race between st_remove() and st_open()
CVE-2026-99153		scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152		scsi: libiscsi: Validate the task named by a management response
CVE-2026-99154		scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151		drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions

Showing top 20 of 117 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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