CVE-2024-36964Network attack vector

Privilege escalation via unfiltered 9P permission bits

Published Jun 3, 2024 · Updated Aug 5, 2026

Improper permission handling in the Linux kernel 9P client allows remote attackers to gain elevated privileges through a malicious 9P server. The v9fs_vfs_get_inode function in fs/9p/vfs_inode.c copies unfiltered non-RWX bits from a plain 9P2000 stat response into the inode mode, including the setuid bit. Exploitation requires negotiation of plain 9P2000 and a local process to execute the forged setuid file; the gained identity follows dfltuid, commonly root.

CVSS severity8.8
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper permission handling in the Linux kernel 9P client allows remote attackers to gain elevated privileges through a malicious 9P server. The v9fs_vfs_get_inode function in fs/9p/vfs_inode.c copies unfiltered non-RWX bits from a plain 9P2000 stat response into the inode mode, including the setuid bit. Exploitation requires negotiation of plain 9P2000 and a local process to execute the forged setuid file; the gained identity follows dfltuid, commonly root.

The record

CVE
CVE-2024-36964
Published
Jun 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 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=29a3e8657d2a2640384166e3fe29a086d235fc33
  2. Affected versionversion=3.0.5 <3.1
  3. Affected versionversion=3.1
  4. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <157d468e34fdd3cb1ddc07c2be32fb3b02826b02
  5. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <5a605930e19f451294bd838754f7d66c976a8a2c
  6. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <ad4f65328661392de74e3608bb736fedf3b67e32
  7. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <ca9b5c81f0c918c63d73d962ed8a8e231f840bc8
  8. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <cd25e15e57e68a6b18dc9323047fe9c68b99290b
  9. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <df1962a199783ecd66734d563caf0fedecf08f96
  10. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <e55c601af3b1223a84f9f27f9cdbd2af5e203bf3
  11. Affected versionversion=45089142b1497dab2327d60f6c71c40766fc3ea4 <e90bc596a74bb905e0a45bf346038c3f9d1e868d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=29a3e8657d2a2640384166e3fe29a086d235fc33; version=3.0.5 <3.1; version=3.1; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <157d468e34fdd3cb1ddc07c2be32fb3b02826b02; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <5a605930e19f451294bd838754f7d66c976a8a2c; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <ad4f65328661392de74e3608bb736fedf3b67e32; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <ca9b5c81f0c918c63d73d962ed8a8e231f840bc8; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <cd25e15e57e68a6b18dc9323047fe9c68b99290b; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <df1962a199783ecd66734d563caf0fedecf08f96; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <e55c601af3b1223a84f9f27f9cdbd2af5e203bf3; version=45089142b1497dab2327d60f6c71c40766fc3ea4 <e90bc596a74bb905e0a45bf346038c3f9d1e868d

Published CVSS scores

8.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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

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

T1068Exploitation for Privilege Escalation

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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