CVE-2024-53179Network attack vector

Remote kernel compromise via signing-key use-after-free race

Published Dec 27, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel CIFS client allows remote attackers controlling an SMB server to compromise the kernel during signed SMB2.1 mounts. A reconnect or DFS re-referral can free ses->auth_key.response in cifs_setup_session while smb2_calc_signature passes the stale key to crypto_shash_setkey. No client credentials are required by a malicious, compromised, or spoofed SMB server, and successful exploitation permits kernel-memory disclosure, modification, or a crash.

CVSS severity9.8
Critical
EPSS probability0.60%
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 kernel CIFS client allows remote attackers controlling an SMB server to compromise the kernel during signed SMB2.1 mounts. A reconnect or DFS re-referral can free ses->auth_key.response in cifs_setup_session while smb2_calc_signature passes the stale key to crypto_shash_setkey. No client credentials are required by a malicious, compromised, or spoofed SMB server, and successful exploitation permits kernel-memory disclosure, modification, or a crash.

The record

CVE
CVE-2024-53179
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.12
  2. Affected versionversion=32811d242ff6f28da2ab18c90a15e32fd958e774 <0e2b654a3848bf9da3b0d54c1ccf3f1b8c635591
  3. Affected versionversion=32811d242ff6f28da2ab18c90a15e32fd958e774 <343d7fe6df9e247671440a932b6a73af4fa86d95
  4. Affected versionversion=32811d242ff6f28da2ab18c90a15e32fd958e774 <39619c65ab4bbb3e78c818f537687653e112764d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.12; version=32811d242ff6f28da2ab18c90a15e32fd958e774 <0e2b654a3848bf9da3b0d54c1ccf3f1b8c635591; version=32811d242ff6f28da2ab18c90a15e32fd958e774 <343d7fe6df9e247671440a932b6a73af4fa86d95; version=32811d242ff6f28da2ab18c90a15e32fd958e774 <39619c65ab4bbb3e78c818f537687653e112764d

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8kernel.org CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Canonical UbuntuCVSS: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.

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

No observations available

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

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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