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CVE Record

CVE-2020-36775: f2fs: fix to avoid potential deadlock

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid potential deadlock Using f2fs_trylock_op() in f2fs_write_compressed_pages() to avoid potential deadlock like we did in f2fs_write_single_data_page().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a potential deadlock in f2fs, the Flash-Friendly File System. Affected systems could hang during compressed page write handling, creating an availability risk. The provided sources do not give CVSS scoring, exploitability details, or evidence of active exploitation.

Executive priority

Handle through normal kernel patch governance, with higher priority for production systems using f2fs. Business urgency is moderate-to-unclear because the issue affects availability, but the provided sources lack CVSS, exploit reports, and affected product detail.

Technical view

The fix changes f2fs_write_compressed_pages() to use f2fs_trylock_op(), matching prior deadlock avoidance in f2fs_write_single_data_page(). The source bundle lists Linux kernel 5.6, 5.6.7, 5.7, and commit-based affected identifiers, but exact downstream exposure depends on distribution backports.

Likely exposure

Exposure is most relevant to Linux systems using f2fs, especially where f2fs compression is used. The bundle does not identify affected distributions, CPEs, appliances, or cloud images, so organizations must map vendor kernels against the referenced stable fixes.

Exploitation context

The sources describe a potential kernel deadlock, not a public exploit path. The CVE is not listed as KEV in the provided data, and no cited source states active exploitation. Treat this as an availability-risk kernel maintenance issue unless vendor advisories add stronger evidence.

Researcher notes

Evidence is limited to the CVE record and Linux stable commit references. There is no CWE, CVSS vector, CPE list, or exploit status in the bundle. Focus analysis on kernel version mapping, f2fs usage, compression paths, and downstream vendor backport confirmation.

Mitigation direction

  • Check Linux distribution advisories for a kernel containing the referenced f2fs stable fixes.
  • Upgrade or backport the applicable kernel fix through normal vendor-supported channels.
  • Prioritize systems that mount f2fs filesystems or enable f2fs compression.
  • Monitor vendor guidance because the provided sources do not name a standalone workaround.

Validation and detection

  • Inventory Linux kernel versions and identify systems using f2fs filesystems.
  • Check whether vendor kernels include the referenced stable f2fs commits.
  • Review filesystem mount configuration for f2fs and compression usage.
  • Track remediation status separately for upstream kernels and distribution-backported kernels.
Prepared
Confidence
medium
Sources
5

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-36775 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
4Source 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
LinuxLinux4c8ff7095bef64fc47e996a938f7d57f9e077da3, 4c8ff7095bef64fc47e996a938f7d57f9e077da3unaffected
LinuxLinux5.6, 0, 5.6.7, 5.7affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.