Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5 ksmbd ksmbd_ipc_login_request_ext memory leak

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.39

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. This affects the function ksmbd_ipc_login_request_ext of the component ksmbd. Such manipulation leads to memory leak. This vulnerability is traded as CVE-2026-90175. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.6.156/6.12.109/6.18.51/7.2.5. Affected by this issue is the function ksmbd_ipc_login_request_ext of the component ksmbd. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-90175 since 09/11/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/17/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 4d6fe49fa3e7fbd779c761518e6572e340233c9b/c9f2872e91b9fe99c1d0ba768906f7aeb48c8517/7a98c3b903b10c4d6176948254012b5ca24b071b/abb5146b2d8197d695ea9eaa0847c73e34f00985/1c3ebf832d010c08afe1359215d4121cb1ed2de5 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 4d6fe49fa3e7fbd779c761518e6572e340233c9b/c9f2872e91b9fe99c1d0ba768906f7aeb48c8517/7a98c3b903b10c4d6176948254012b5ca24b071b/abb5146b2d8197d695ea9eaa0847c73e34f00985/1c3ebf832d010c08afe1359215d4121cb1ed2de5

Timelineinfo

09/11/2026 CVE reserved
09/17/2026 +6 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-90175 (🔒)
GCVE (CVE): GCVE-0-2026-90175
GCVE (VulDB): GCVE-100-406694

Entryinfo

Created: 09/17/2026 20:21
Changes: 09/17/2026 20:21 (59)
Complete: 🔍
Cache ID: 216::103

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