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NVD Vulnerability Details :
CVE-2026-64140
Received
More InfoOfficial Page
Source-416baaa9-dc9f-4396-8d5f-8c081fb06d67
View Known Exploited Vulnerability (KEV) details
Published At-19 Jul, 2026 | 16:17
Updated At-20 Jul, 2026 | 15:17

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in proc_show_files() When a SMB2 client opens a file with a durable v2 handle and then issues SMB2 SESSION_LOGOFF, session_fd_check() clears fp->tcon = NULL on the reconnectable file pointer but leaves the fp registered in global_ft.idr until the durable scavenger fires (up to fp->durable_timeout seconds later). During that window any read of /proc/fs/ksmbd/files (mode 0400) panics the kernel because proc_show_files() walks global_ft.idr and unconditionally dereferences fp->tcon->id with no NULL guard. Reproducer requires only a successful SMB2 SESSION_SETUP and a share configured with 'durable handles = yes'. KASAN report on mainline 70390501d194: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:proc_show_files+0x118/0x740 Call Trace: proc_show_files+0x118/0x740 seq_read_iter+0x4ef/0xe10 proc_reg_read_iter+0x1b7/0x280 ... Guard the dereference. A durable-disconnected fp legitimately has no tcon; report its tree id as 0 rather than oopsing.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CPE Matches

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://git.kernel.org/stable/c/8eab081627b67216d1c8f638b68289b500dc9a6b416baaa9-dc9f-4396-8d5f-8c081fb06d67
N/A
https://git.kernel.org/stable/c/904901561e61a2b559070b20c74a8c95491f30aa416baaa9-dc9f-4396-8d5f-8c081fb06d67
N/A
Hyperlink: https://git.kernel.org/stable/c/8eab081627b67216d1c8f638b68289b500dc9a6b
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/904901561e61a2b559070b20c74a8c95491f30aa
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Resource: N/A
Change History
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