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Back to active CVEs
High · CVSS 7.8CVE-2025-39888

fuse: Block access to folio overlimitCVE-2025-39888

Answer in brief

CVE-2025-39888 records a High severity (CVSS 7.8) vulnerability in fuse: Block access to folio overlimit. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2025Updated Oct 19, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
8 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=3568a956932621cafadafc8b75fcf6dc06555105 <623719227b114d73a2cee45f1b343ced63ce09ec || >=3568a956932621cafadafc8b75fcf6dc06555105 <9d81ba6d49a7457784f0b6a71046818b86ec7e44623719227b114d73a2cee45f1b343ced63ce09ec, 9d81ba6d49a7457784f0b6a71046818b86ec7e44
Linux/Linuxgeneric6.16Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 623719227b114d73a2cee45f1b343ced63ce09ec if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 23, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: fuse: Block access to folio overlimit syz reported a slab-out-of-bounds Write in fuse_dev_do_write. When the number of bytes to be retrieved is truncated to the upper limit by fc->max_pages and there is an offset, the oob is triggered. Add a loop termination condition to prevent overruns.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Unvalidated user pointers in RTIO syscall verifiers allow a user-mode thread to write kernel memoryAlso CWE-787
  • I2S configure syscall handler passes an unvalidated user-supplied kernel object pointer to driversAlso CWE-787
  • Bluetooth LE Controller accepts received PDUs whose length field exceeds the configured maximum receive length, causing out-of-bounds read and writeAlso CWE-787
  • Inverted memory-permission check in the RTIO syscall verifier allows a user-mode thread to read and write arbitrary kernel memoryAlso CWE-787

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 4, 2026
References
2 linked sources
Open source record