CVE-2026-90169— ksmbd: free preauth sessions on connection teardown
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： ksmbd：在连接断开时释放预认证会话 SMB3.1.1 的多通道绑定（multichannel binding）会在 NTLM 的协商（negotiate）和认证（authenticate）请求之间，通过 对象保留预认证哈希值。 在 NTLM 协商阶段，系统会分配该对象并返回 。如果客户端在发送认证请求之前断开连接，既不会执行认证路径，也不会触发错误清理路径，导致该对象未被释放（内存泄漏）。 修复措施： 在断开连接时释放所有剩余的预认证会话。在分配连接结构时初始化会话列表
Affected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | f5a544e3bab78142207e0242d22442db85ba1eff< effcf48d79d8aa53113d8289e140746f25ceb62c |
affected |
f5a544e3bab78142207e0242d22442db85ba1eff< b62b1ebb25f0a19067ed5b1a86036b2dc98be44f |
affected | ||
f5a544e3bab78142207e0242d22442db85ba1eff< a41a98ee16ae038751b6639decadaa3ce15ca18a |
affected | ||
f5a544e3bab78142207e0242d22442db85ba1eff< 8e2ebc77678832e981adc008d25cd8f67d08ebc4 |
affected | ||
f5a544e3bab78142207e0242d22442db85ba1eff< 06c7b1d731bc105a8644f1b70165ba8b9416cbab |
affected | ||
5.15 |
affected | ||
< 5.15 |
unaffected | ||
6.6.157≤ 6.6.* |
unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2026-90169
Vulnerability Information
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Vulnerability Title
ksmbd: free preauth sessions on connection teardown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: free preauth sessions on connection teardown
SMB3.1.1 multichannel binding preserves the preauthentication hash in a
preauth_session between the NTLM negotiate and authenticate requests.
The binding NTLM negotiate allocates this object and returns
STATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends
the authenticate request, neither the authenticate nor error cleanup paths
free the object.
Release any remaining preauthentication sessions when tearing down the
connection. Initialize the list when allocating the connection so that this
cleanup is safe regardless of the negotiated dialect.
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
II. Public POCs for CVE-2026-90169
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-90169 (4)
Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total
| CVE-2026-90235 | 9.8 CRITICAL | sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE |
| CVE-2026-90104 | 9.8 CRITICAL | NFSv4.1: zero referring call lists before decoding |
| CVE-2026-90173 | 9.8 CRITICAL | smb: smbdirect: free completion queues with ib_free_cq() |
| CVE-2026-92489 | 9.8 CRITICAL | xfrm: Fix skb double-free in xfrm_dev_direct_output() |
| CVE-2026-90151 | 9.8 CRITICAL | NFSv4: remove callback IDR entry on client allocation failure |
| CVE-2026-90110 | 9.4 CRITICAL | inetpeer: randomize RB-tree node comparison using SipHash |
| CVE-2026-90230 | 9.1 CRITICAL | nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate() |
| CVE-2026-90414 | 9.1 CRITICAL | IB/isert: reject PDUs declaring more data than was received |
| CVE-2026-90413 | 9.1 CRITICAL | IB/isert: reject login PDUs declaring more data than was received |
| CVE-2026-90380 | 8.8 HIGH | wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete |
| CVE-2026-93042 | 8.8 HIGH | dmaengine: dw-edma: Terminate all descriptors without callbacks |
| CVE-2026-90425 | 8.8 HIGH | iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID |
| CVE-2026-90240 | 8.8 HIGH | iommu/vt-d: Flush context cache with correct SID when tearing down aliases |
| CVE-2026-90381 | 8.8 HIGH | wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx() |
| CVE-2026-90329 | 8.8 HIGH | HID: synchronize input before cleaning up a failed probe |
| CVE-2026-90357 | 8.8 HIGH | wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement |
| CVE-2026-90379 | 8.8 HIGH | wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash |
| CVE-2026-90162 | 8.8 HIGH | ksmbd: defer publishing granted locks to prevent UAF/double-free race |
| CVE-2026-93189 | 8.8 HIGH | HID: core: quiesce input in hid_hw_stop() to prevent use-after-free |
| CVE-2026-90255 | 8.8 HIGH | Bluetooth: hci_conn: fix the SCO setup context lifetime |
Showing top 20 of 600 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
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veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2026-90169
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