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CVE-2026-98175— smb: client: cancel reconnect work in clean_demultiplex_info()

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，已修复以下漏洞： smb 客户端：在 中取消重连工作 会取消 的延迟工作，但并未取消 。当解复用（demultiplex）线程退出时，如果仍有重连工作排队，则可能导致释放后使用（use-after-free）漏洞。 具体调用路径如下： 随后，在 工作队列上执行： 修复方法：在释放 之前，于 中取消 的延迟工作。这一做法与 中的处理方式一致。

CVSS 7.5 · High EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux 53e0e11efe9289535b060a51d4cf37c25e0d0f2b< 180380272f116dbd2b0354c5c7872e112e519149 affected
53e0e11efe9289535b060a51d4cf37c25e0d0f2b< e3f6a779433d13aafb5edab59e4f9313051e8a52 affected
53e0e11efe9289535b060a51d4cf37c25e0d0f2b< 7ab9ceedd860216fb97f2d8574cbe58b8906f42a affected
53e0e11efe9289535b060a51d4cf37c25e0d0f2b< 2e5103e11a17c274715dd56cf185eeedccf686b8 affected
53e0e11efe9289535b060a51d4cf37c25e0d0f2b< c65eae6f61d1778ff7a82e4aae4080e26f486af1 affected
e008a962311a875a828cbae54b43285858aaa6c8 affected
123b228a09b90b50b0a9d6eb8294cf0c42efc029 affected
0ba4c6eaaacbcc4b18f51bb3b1567c65a8fecca9 affected
… +20 more rows
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I. Basic Information for CVE-2026-98175

Vulnerability Information
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Vulnerability Title
smb: client: cancel reconnect work in clean_demultiplex_info()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: cancel reconnect work in clean_demultiplex_info() clean_demultiplex_info() cancels server->echo delayed work but not server->reconnect, which can cause a use-after-free when the demultiplex thread exits while a reconnect work is still queued: cifs_demultiplex_thread() cifs_readv_from_socket() cifs_reconnect() __cifs_reconnect() cifs_queue_server_reconn() mod_delayed_work(cifsiod_wq, &server->reconnect, 0) clean_demultiplex_info() cancel_delayed_work_sync(&server->echo) // echo canceled // reconnect NOT canceled kfree_sensitive(server) // server freed ...later, on cifsiod_wq: smb2_reconnect_server() server->srv_count // UAF read of freed server Fix this by canceling server->reconnect delayed work in clean_demultiplex_info() before the server is freed, the same way cifs_put_tcp_session() already does.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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 53e0e11efe9289535b060a51d4cf37c25e0d0f2b ~ 180380272f116dbd2b0354c5c7872e112e519149 -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-98175

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III. Intelligence Information for CVE-2026-98175

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Patches & Fixes for CVE-2026-98175 (5)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98305 7.8 HIGH net: dsa: mxl862xx: disable the stats poll on teardown
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98311 7.8 HIGH wifi: virt_wifi: don't transfer operstate before register
CVE-2026-98276 7.8 HIGH net: lock the socket in sock_gettstamp()
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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