Host disruption via uncanceled SMB reconnect work
Published Oct 6, 2026 · Updated Oct 6, 2026
Use-after-free in the Linux Kernel SMB client allows local users to disrupt the host during SMB reconnect and connection teardown. The clean_demultiplex_info() function frees server state after canceling echo work but leaves reconnect work queued, so smb2_reconnect_server() reads the freed object. The race requires an SMB client connection and a reconnect overlapping demultiplex-thread exit; the published crash shows a use-after-free read, not code execution.
Summary
What happened
Use-after-free in the Linux Kernel SMB client allows local users to disrupt the host during SMB reconnect and connection teardown. The clean_demultiplex_info() function frees server state after canceling echo work but leaves reconnect work queued, so smb2_reconnect_server() reads the freed object. The race requires an SMB client connection and a reconnect overlapping demultiplex-thread exit; the published crash shows a use-after-free read, not code execution.
The record
- CVE
- CVE-2026-98175
- Published
- Oct 6, 2026
- Updated
- Oct 6, 2026
- Vendor
- Linux Foundation
- Product
- Linux Kernel
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 6, 2026CVE publishedPublication date reported by the CVE source.
- Oct 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0ba4c6eaaacbcc4b18f51bb3b1567c65a8fecca9
- Affected versionversion=123b228a09b90b50b0a9d6eb8294cf0c42efc029
- Affected versionversion=15a12fbbf365a483b1c19f9caeb707b3bea77e10
- Affected versionversion=3.10.107 <3.11
- Affected versionversion=3.12.70 <3.13
- Affected versionversion=3.16.42 <3.17
- Affected versionversion=3.18.47 <3.19
- Affected versionversion=4.10
- Affected versionversion=4.1.38 <4.2
- Affected versionversion=4.4.40 <4.5
- Affected versionversion=4.8.16 <4.9
- Affected versionversion=48f9526f4dcb4b132fe0dc2450835311e3b013a6
- Affected versionversion=4.9.1 <4.10
- Affected versionversion=53e0e11efe9289535b060a51d4cf37c25e0d0f2b <180380272f116dbd2b0354c5c7872e112e519149
- Affected versionversion=53e0e11efe9289535b060a51d4cf37c25e0d0f2b <2e5103e11a17c274715dd56cf185eeedccf686b8
- Affected versionversion=53e0e11efe9289535b060a51d4cf37c25e0d0f2b <7ab9ceedd860216fb97f2d8574cbe58b8906f42a
- Affected versionversion=53e0e11efe9289535b060a51d4cf37c25e0d0f2b <c65eae6f61d1778ff7a82e4aae4080e26f486af1
- Affected versionversion=53e0e11efe9289535b060a51d4cf37c25e0d0f2b <e3f6a779433d13aafb5edab59e4f9313051e8a52
- Affected versionversion=d0d2a4c82942e2f51e4984beea1f7e5a994bd06c
- Affected versionversion=e008a962311a875a828cbae54b43285858aaa6c8
- Affected versionversion=f0b715409cb9cf7e21e690f9b163047739761962
- Affected versionversion=ff04da387c10b6bf7b510392742c8cd46c130fd6
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
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Technologies
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