CVE-2023-53796

Information disclosure via uncleared F2FS directory block

Published Dec 9, 2025 · Updated May 11, 2026

Information disclosure in affected Linux kernel branches from 4.3 allows attackers to expose uninitialized memory through F2FS conversion. f2fs_move_inline_dirents() allocates a regular directory block without clearing it fully before copying inline entries and writing the block to disk. Triggering requires conversion of an inline F2FS directory; the bounded result is residual kernel-memory disclosure on storage, not code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in affected Linux kernel branches from 4.3 allows attackers to expose uninitialized memory through F2FS conversion. f2fs_move_inline_dirents() allocates a regular directory block without clearing it fully before copying inline entries and writing the block to disk. Triggering requires conversion of an inline F2FS directory; the bounded result is residual kernel-memory disclosure on storage, not code execution.

The record

CVE
CVE-2023-53796
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 9, 2025CVE 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=4.3
  2. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <00b5587326625d0fddb2a5f5a3d4acd950102ace
  3. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <117d4f6687b1f74423b5d398ea95c63b262a8e73
  4. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <2bef8314fcf94ddc27e22d03f237c0fafd00de33
  5. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <4e3b4b170bd43db1d8a93a6bd0ea434b17cc86f7
  6. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <9a5571cff4ffcfc24847df9fd545cc5799ac0ee5
  7. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <a6807ef0f3b3d8508d3b07a2e35de8a91820a014
  8. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <eebaecef0095bb8f493c03982da75c6e7bae1056
  9. Affected versionversion=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <f07a8d61b6ea81bb3cbe0638af40f8824d6147fd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.3; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <00b5587326625d0fddb2a5f5a3d4acd950102ace; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <117d4f6687b1f74423b5d398ea95c63b262a8e73; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <2bef8314fcf94ddc27e22d03f237c0fafd00de33; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <4e3b4b170bd43db1d8a93a6bd0ea434b17cc86f7; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <9a5571cff4ffcfc24847df9fd545cc5799ac0ee5; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <a6807ef0f3b3d8508d3b07a2e35de8a91820a014; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <eebaecef0095bb8f493c03982da75c6e7bae1056; version=4ec17d688d74b6b7cb10043c57ff4818cde2b0ca <f07a8d61b6ea81bb3cbe0638af40f8824d6147fd

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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