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CVE-2026-23228— smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于kthread_run失败时未递减active_num_conn，可能导致资源泄漏。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4210c3555db4b38bade92331b153e583261f05f9< 6dd2645cf080a75be31fa66063c7332b291f46f0 affected
d5d7847e57ac69fa99c18b363a34419bcdb5a281< 7ddd69cd1338c6197e1b6b19cec60d99c8633e4f affected
0d0d4680db22eda1eea785c47bbf66a9b33a8b16< 787769c8cc50416af7b8b1a36e6bcd6aaa7680aa affected
0d0d4680db22eda1eea785c47bbf66a9b33a8b16< baf664fc90a6139a39a58333e4aaa390c10d45dc affected
0d0d4680db22eda1eea785c47bbf66a9b33a8b16< cd25e0d809531a67e9dd53b19012d27d2b13425f affected
0d0d4680db22eda1eea785c47bbf66a9b33a8b16< 599271110c35f6b16e2e4e45b9fbd47ed378c982 affected
0d0d4680db22eda1eea785c47bbf66a9b33a8b16< 77ffbcac4e569566d0092d5f22627dfc0896b553 affected
5.15.91< 5.15.201 affected
… +10 more rows
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I. Basic Information for CVE-2026-23228

Vulnerability Information
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Vulnerability Title
smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection() On kthread_run() failure in ksmbd_tcp_new_connection(), the transport is freed via free_transport(), which does not decrement active_num_conn, leaking this counter. Replace free_transport() with ksmbd_tcp_disconnect().
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于kthread_run失败时未递减active_num_conn，可能导致资源泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4210c3555db4b38bade92331b153e583261f05f9 ~ 6dd2645cf080a75be31fa66063c7332b291f46f0 -
Linux Linux 6.2 -

II. Public POCs for CVE-2026-23228

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III. Intelligence Information for CVE-2026-23228

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Same Patch Batch · Linux · 2026-02-18 · 31 CVEs total

CVE-2026-23230 8.8 HIGH smb: client: split cached_fid bitfields to avoid shared-byte RMW races
CVE-2026-23226 8.8 HIGH ksmbd: add chann_lock to protect ksmbd_chann_list xarray
CVE-2025-71234 8.8 HIGH wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add
CVE-2026-23227 7.8 HIGH drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to
CVE-2026-23225 7.8 HIGH sched/mmcid: Don't assume CID is CPU owned on mode switch
CVE-2026-23224 7.8 HIGH erofs: fix UAF issue for file-backed mounts w/ directio option
CVE-2026-23222 7.8 HIGH crypto: omap - Allocate OMAP_CRYPTO_FORCE_COPY scatterlists correctly
CVE-2025-71236 7.5 HIGH scsi: qla2xxx: Validate sp before freeing associated memory
CVE-2025-71233 PCI: endpoint: Avoid creating sub-groups asynchronously
CVE-2026-23229 crypto: virtio - Add spinlock protection with virtqueue notification
CVE-2026-23223 xfs: fix UAF in xchk_btree_check_block_owner
CVE-2026-23221 bus: fsl-mc: fix use-after-free in driver_override_show()
CVE-2026-23220 ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths
CVE-2025-71237 nilfs2: Fix potential block overflow that cause system hang
CVE-2025-71235 scsi: qla2xxx: Delay module unload while fabric scan in progress
CVE-2026-23211 mm, swap: restore swap_space attr aviod kernel panic
CVE-2025-71232 scsi: qla2xxx: Free sp in error path to fix system crash
CVE-2025-71231 crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode
CVE-2025-71230 hfs: ensure sb->s_fs_info is always cleaned up
CVE-2025-71229 wifi: rtw88: Fix alignment fault in rtw_core_enable_beacon()

Showing top 20 of 31 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23228

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