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CVE-2026-90175— smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer

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 服务器：修复 返回缓冲区的内存泄漏 在 调用之后，应无条件地释放该缓冲区。 kmemleak 检测报告：

AI Predicted 5.3 Difficulty: Hard EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1027 · Obfuscated Files or Information

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 8a3cd890fd2a7d016a821a1c9dfd8a84d45ad320< 4d6fe49fa3e7fbd779c761518e6572e340233c9b affected
a77e0e02af1c2db5fc040511aa78a58a52e116ab< c9f2872e91b9fe99c1d0ba768906f7aeb48c8517 affected
a77e0e02af1c2db5fc040511aa78a58a52e116ab< 7a98c3b903b10c4d6176948254012b5ca24b071b affected
a77e0e02af1c2db5fc040511aa78a58a52e116ab< abb5146b2d8197d695ea9eaa0847c73e34f00985 affected
a77e0e02af1c2db5fc040511aa78a58a52e116ab< 1c3ebf832d010c08afe1359215d4121cb1ed2de5 affected
6.6.141< 6.6.157 affected
6.12 affected
< 6.12 unaffected
… +5 more rows
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I. Basic Information for CVE-2026-90175

Vulnerability Information
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Vulnerability Title
smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer Free it unconditionally after ksmbd_alloc_user() calls. kmemleak splat: unreferenced object 0xffff888103b83540 (size 192): comm "pool-0", pid 16970, jiffies 4377290937 hex dump (first 32 bytes): 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 408ccc66): __kvmalloc_node_noprof+0x730/0x920 handle_generic_event+0xec/0x1a0 [ksmbd] genl_family_rcv_msg_doit+0xe0/0x130 genl_rcv_msg+0x181/0x290 netlink_rcv_skb+0x4f/0x100 genl_rcv+0x28/0x40 netlink_unicast+0x1e6/0x2c0 netlink_sendmsg+0x20a/0x450 ____sys_sendmsg+0x2e8/0x310 ___sys_sendmsg+0x78/0xc0 __sys_sendmsg+0x63/0xc0 do_syscall_64+0xa1/0x670 entry_SYSCALL_64_after_hwframe+0x76/0x7e
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8a3cd890fd2a7d016a821a1c9dfd8a84d45ad320 ~ 4d6fe49fa3e7fbd779c761518e6572e340233c9b -
Linux Linux 6.12 -

II. Public POCs for CVE-2026-90175

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III. Intelligence Information for CVE-2026-90175

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Patches & Fixes for CVE-2026-90175 (5)

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 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90175

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