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CVE Record

CVE-2024-36964: fs/9p: only translate RWX permissions for plain 9P2000

In the Linux kernel, the following vulnerability has been resolved: fs/9p: only translate RWX permissions for plain 9P2000 Garbage in plain 9P2000's perm bits is allowed through, which causes it to be able to set (among others) the suid bit. This was presumably not the intent since the unix extended bits are handled explicitly and conditionally on .u.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects the 9p filesystem permission handling. In plain 9P2000 mode, unexpected permission bits could pass through and set special Unix bits such as SUID. Business urgency is highest for systems that actually use 9p mounts, including virtualization or shared filesystem scenarios.

Executive priority

Treat this as a targeted Linux kernel remediation item, not a broad internet-facing emergency. Prioritize environments using 9p file sharing, then fold remaining Linux systems into normal kernel patch cycles once vendor packages are available.

Technical view

The kernel fs/9p code incorrectly translated permission bits for plain 9P2000. The CVE says garbage permission bits were allowed through and could set the SUID bit, while Unix extension bits are meant to be handled explicitly and conditionally on .u. Stable kernel fixes are referenced.

Likely exposure

Exposure appears limited to Linux systems using the 9p filesystem, especially plain 9P2000 rather than Unix extension handling. The supplied version data is incomplete and ambiguous, so kernel and distribution advisories should be checked for exact affected builds.

Exploitation context

The source bundle does not show KEV listing, public exploitation, exploit availability, or real-world attacks. The impact implied by the CVE is improper permission translation that may allow special permission bits to be set in affected 9p contexts.

Researcher notes

The record lacks CVSS, CWE, and detailed affected-version ranges in the supplied bundle. Analysis should focus on fs/9p permission translation behavior, plain 9P2000 mode, and whether local workloads can influence permission bits on affected mounts.

Mitigation direction

  • Apply Linux vendor kernel updates that include the referenced stable fixes.
  • Prioritize hosts using 9p mounts or virtualization shared filesystems.
  • Check Debian LTS and other distribution advisories for packaged kernel status.
  • Remove or disable unnecessary 9p usage where operationally feasible.
  • Track kernel stable commits listed in the CVE references.

Validation and detection

  • Inventory Linux systems with 9p filesystem support or active 9p mounts.
  • Confirm kernel package versions against distribution security advisories.
  • Verify whether deployed kernels include the referenced stable commits.
  • Review 9p mount configurations for plain 9P2000 usage.
  • Check file permission monitoring for unexpected SUID-bearing files in 9p paths.
Prepared
Confidence
medium
Sources
11

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2024-36964 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
10Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux45089142b1497dab2327d60f6c71c40766fc3ea4, 45089142b1497dab2327d60f6c71c40766fc3ea4, 45089142b1497dab2327d60f6c71c40766fc3ea4, 45089142b1497dab2327d60f6c71c40766fc3ea4, 45089142b1497dab2327d60f6c71c40766fc3ea4, 45089142b1497dab2327d60f6c71c40766fc3ea4, 45089142b1497dab2327d60f6c71c40766fc3ea4, 45089142b1497dab2327d60f6c71c40766fc3ea4, 29a3e8657d2a2640384166e3fe29a086d235fc33unaffected
LinuxLinux3.1, 0, 4.19.314, 5.4.276, 5.10.217, 5.15.159, 6.1.91, 6.6.31, 6.8.10, 6.9affected
Weakness

CWE details

No CWE listed

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