CVE-2024-26928

Kernel use-after-free via exiting SMB session traversal

Published Apr 28, 2024 · Updated May 11, 2026

Use-after-free in the Linux SMB client allows local users to corrupt kernel memory by reading open_files during session teardown. cifs_debug_files_proc_show() traverses an SMB session's connection and open-file lists after the session enters SES_EXITING, allowing teardown to free an object that the procfs reader still dereferences. The open_files entry is mode 0400, so the read requires administrative access and concurrent SMB session teardown; the kernel record documents no demonstrated exploit outcome.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux SMB client allows local users to corrupt kernel memory by reading open_files during session teardown. cifs_debug_files_proc_show() traverses an SMB session's connection and open-file lists after the session enters SES_EXITING, allowing teardown to free an object that the procfs reader still dereferences. The open_files entry is mode 0400, so the read requires administrative access and concurrent SMB session teardown; the kernel record documents no demonstrated exploit outcome.

The record

CVE
CVE-2024-26928
Published
Apr 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 28, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.20
  2. Affected versionversion=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <229042314602db62559ecacba127067c22ee7b88
  3. Affected versionversion=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <3402faf78b2516b0af1259baff50cc8453ef0bd1
  4. Affected versionversion=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <8f8718afd446cd4ea3b62bacc3eec09f8aae85ee
  5. Affected versionversion=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <a140224bcf87eb98a87b67ff4c6826c57e47b704
  6. Affected versionversion=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <a65f2b56334ba4dc30bd5ee9ce5b2691b973344d
  7. Affected versionversion=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <ca545b7f0823f19db0f1148d59bc5e1a56634502

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <229042314602db62559ecacba127067c22ee7b88; version=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <3402faf78b2516b0af1259baff50cc8453ef0bd1; version=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <8f8718afd446cd4ea3b62bacc3eec09f8aae85ee; version=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <a140224bcf87eb98a87b67ff4c6826c57e47b704; version=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <a65f2b56334ba4dc30bd5ee9ce5b2691b973344d; version=dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 <ca545b7f0823f19db0f1148d59bc5e1a56634502

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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