CVE-2024-39301

System crash via uninitialized 9P response tag

Published Jun 25, 2024 · Updated May 11, 2026

Improper initialization in affected Linux kernel branches from 3.2 allows local users to crash the system during a failing 9P mount. When p9_check_errors() returns early in p9_client_rpc(), req->rc.tag remains uninitialized, but trace_9p_client_res() still reads and prints it. Exploitation requires the ability to initiate a 9P mount, and the documented consequence is system availability loss without confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper initialization in affected Linux kernel branches from 3.2 allows local users to crash the system during a failing 9P mount. When p9_check_errors() returns early in p9_client_rpc(), req->rc.tag remains uninitialized, but trace_9p_client_res() still reads and prints it. Exploitation requires the ability to initiate a 9P mount, and the documented consequence is system availability loss without confidentiality or integrity impact.

The record

CVE
CVE-2024-39301
Published
Jun 25, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-665, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 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=3.2
  2. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <124947855564572713d705a13be7d0c9dae16a17
  3. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <2101901dd58c6da4924bc5efb217a1d83436290b
  4. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <25460d6f39024cc3b8241b14c7ccf0d6f11a736a
  5. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <6c1791130b781c843572fb6391c4a4c5d857ab17
  6. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <72c5d8e416ecc46af370a1340b3db5ff0b0cc867
  7. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <89969ffbeb948ffc159d19252e7469490103011b
  8. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <ca71f204711ad24113e8b344dc5bb8b0385f5672
  9. Affected versionversion=348b59012e5c6402741d067cf6eeeb6271999d06 <fe5c604053c36c62af24eee8a76407d026ea5163

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=348b59012e5c6402741d067cf6eeeb6271999d06 <124947855564572713d705a13be7d0c9dae16a17; version=348b59012e5c6402741d067cf6eeeb6271999d06 <2101901dd58c6da4924bc5efb217a1d83436290b; version=348b59012e5c6402741d067cf6eeeb6271999d06 <25460d6f39024cc3b8241b14c7ccf0d6f11a736a; version=348b59012e5c6402741d067cf6eeeb6271999d06 <6c1791130b781c843572fb6391c4a4c5d857ab17; version=348b59012e5c6402741d067cf6eeeb6271999d06 <72c5d8e416ecc46af370a1340b3db5ff0b0cc867; version=348b59012e5c6402741d067cf6eeeb6271999d06 <89969ffbeb948ffc159d19252e7469490103011b; version=348b59012e5c6402741d067cf6eeeb6271999d06 <ca71f204711ad24113e8b344dc5bb8b0385f5672; version=348b59012e5c6402741d067cf6eeeb6271999d06 <fe5c604053c36c62af24eee8a76407d026ea5163

Published CVSS scores

5.5NIST NVDCVSS: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

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-665Improper Initialization
T1499Endpoint Denial of Service

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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