CVE-2024-58087Network attack vector

Remote kernel code execution via session lookup race

Published Mar 12, 2025 · Updated Aug 5, 2026

Use-after-free in the ksmbd SMB server in Linux allows remote attackers to execute kernel code through crafted session setup traffic. Session lookup increments a retrieved session reference only after releasing the session-table lock, allowing concurrent expiry to free the object first. The server must have ksmbd enabled; an unauthenticated peer can race session expiry against lookup, causing kernel-memory corruption, code execution, or a panic.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the ksmbd SMB server in Linux allows remote attackers to execute kernel code through crafted session setup traffic. Session lookup increments a retrieved session reference only after releasing the session-table lock, allowing concurrent expiry to free the object first. The server must have ksmbd enabled; an unauthenticated peer can race session expiry against lookup, causing kernel-memory corruption, code execution, or a panic.

The record

CVE
CVE-2024-58087
Published
Mar 12, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2025CVE 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 <2107ab40629aeabbec369cf34b8cf0f288c3eb1b
  2. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <37a0e2b362b3150317fb6e2139de67b1e29ae5ff
  3. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <450a844c045ff0895d41b05a1cbe8febd1acfcfd
  4. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <a39e31e22a535d47b14656a7d6a893c7f6cf758c
  5. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <b95629435b84b9ecc0c765995204a4d8a913ed52
  6. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0626e6641f6b467447c81dd7678a69c66f7746cf <2107ab40629aeabbec369cf34b8cf0f288c3eb1b; version=0626e6641f6b467447c81dd7678a69c66f7746cf <37a0e2b362b3150317fb6e2139de67b1e29ae5ff; version=0626e6641f6b467447c81dd7678a69c66f7746cf <450a844c045ff0895d41b05a1cbe8febd1acfcfd; version=0626e6641f6b467447c81dd7678a69c66f7746cf <a39e31e22a535d47b14656a7d6a893c7f6cf758c; version=0626e6641f6b467447c81dd7678a69c66f7746cf <b95629435b84b9ecc0c765995204a4d8a913ed52; version=5.15

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.0Zero Day InitiativeCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8Linux kernel CNACVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1190Exploit Public-Facing Application

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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