CVE-2024-50283Network attack vector

Pre-auth kernel memory corruption via session race

Published Nov 19, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux ksmbd server allows remote attackers to corrupt kernel memory through pre-authentication SMB session setup. A failed SESSION_SETUP drops the session reference before smb3_preauth_hash_rsp finishes, allowing a concurrent request to free the session while its Preauth_HashValue pointer is still read and written. Reachability requires ksmbd to be running on port 445; malformed concurrent requests need no credentials and can disclose or overwrite kernel memory or panic the host.

CVSS severity9.8
Critical
EPSS probability0.62%
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 ksmbd server allows remote attackers to corrupt kernel memory through pre-authentication SMB session setup. A failed SESSION_SETUP drops the session reference before smb3_preauth_hash_rsp finishes, allowing a concurrent request to free the session while its Preauth_HashValue pointer is still read and written. Reachability requires ksmbd to be running on port 445; malformed concurrent requests need no credentials and can disclose or overwrite kernel memory or panic the host.

The record

CVE
CVE-2024-50283
Published
Nov 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 19, 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

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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=0626e6641f6b467447c81dd7678a69c66f7746cf <1b6ad475d4ed577d34e0157eb507be00c588bf5c
  2. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <b8fc56fbca7482c1e5c0e3351c6ae78982e25ada
  3. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <c6cdc08c25a868a08068dfc319fa9fce982b8e7f
  4. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <cb645064e0811053c94e86677f2e58ed29359d62
  5. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <f7557bbca40d4ca8bb1c6c940ac6c95078bd0827
  6. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0626e6641f6b467447c81dd7678a69c66f7746cf <1b6ad475d4ed577d34e0157eb507be00c588bf5c; version=0626e6641f6b467447c81dd7678a69c66f7746cf <b8fc56fbca7482c1e5c0e3351c6ae78982e25ada; version=0626e6641f6b467447c81dd7678a69c66f7746cf <c6cdc08c25a868a08068dfc319fa9fce982b8e7f; version=0626e6641f6b467447c81dd7678a69c66f7746cf <cb645064e0811053c94e86677f2e58ed29359d62; version=0626e6641f6b467447c81dd7678a69c66f7746cf <f7557bbca40d4ca8bb1c6c940ac6c95078bd0827; version=5.15

Published CVSS scores

7.8CISA ADP VulnrichmentCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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