CVE-2026-90175Hinoki check available

Memory consumption via unreleased login-extension buffers

Published Sep 17, 2026 · Updated Sep 17, 2026

Memory leakage in Linux ksmbd allows attackers to consume kernel memory through SMB login processing on affected kernels. The ksmbd_login_user and ksmbd_krb5_authenticate functions leave buffers returned by ksmbd_ipc_login_request_ext allocated after ksmbd_alloc_user copies their supplementary-group information. Exposure requires active ksmbd and login processing that obtains an extended response; repeated allocations consume memory, but the published report does not demonstrate a crash, hang, or reboot.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Memory leakage in Linux ksmbd allows attackers to consume kernel memory through SMB login processing on affected kernels. The ksmbd_login_user and ksmbd_krb5_authenticate functions leave buffers returned by ksmbd_ipc_login_request_ext allocated after ksmbd_alloc_user copies their supplementary-group information. Exposure requires active ksmbd and login processing that obtains an extended response; repeated allocations consume memory, but the published report does not demonstrate a crash, hang, or reboot.

The record

CVE
CVE-2026-90175
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.12
  2. Affected versionversion=6.6.141 <6.6.157
  3. Affected versionversion=8a3cd890fd2a7d016a821a1c9dfd8a84d45ad320 <4d6fe49fa3e7fbd779c761518e6572e340233c9b
  4. Affected versionversion=a77e0e02af1c2db5fc040511aa78a58a52e116ab <1c3ebf832d010c08afe1359215d4121cb1ed2de5
  5. Affected versionversion=a77e0e02af1c2db5fc040511aa78a58a52e116ab <7a98c3b903b10c4d6176948254012b5ca24b071b
  6. Affected versionversion=a77e0e02af1c2db5fc040511aa78a58a52e116ab <abb5146b2d8197d695ea9eaa0847c73e34f00985
  7. Affected versionversion=a77e0e02af1c2db5fc040511aa78a58a52e116ab <c9f2872e91b9fe99c1d0ba768906f7aeb48c8517

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=6.6.141 <6.6.157; version=8a3cd890fd2a7d016a821a1c9dfd8a84d45ad320 <4d6fe49fa3e7fbd779c761518e6572e340233c9b; version=a77e0e02af1c2db5fc040511aa78a58a52e116ab <1c3ebf832d010c08afe1359215d4121cb1ed2de5; version=a77e0e02af1c2db5fc040511aa78a58a52e116ab <7a98c3b903b10c4d6176948254012b5ca24b071b; version=a77e0e02af1c2db5fc040511aa78a58a52e116ab <abb5146b2d8197d695ea9eaa0847c73e34f00985; version=a77e0e02af1c2db5fc040511aa78a58a52e116ab <c9f2872e91b9fe99c1d0ba768906f7aeb48c8517

Published CVSS scores

5.3Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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