How severe is CVE-2025-70101?

CVE-2025-70101 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-70101 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-70101?

CVE-2025-70101 affects Gkostka Lwext4. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-70101?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-70101 have an EU (EUVD) identifier?

Yes. CVE-2025-70101 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-210055.

When was CVE-2025-70101 published?

CVE-2025-70101 was published on 2026-06-03 and last updated on 2026-06-29.

CVE-2025-70101

CVE-2025-70101 is a medium-severity vulnerability in Gkostka Lwext4 with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-210055
Weakness: CWE-125
Affected product: Gkostka Lwext4
Published: 2026-06-03
Last modified: 2026-06-29

Description

An out-of-bounds read in the ext4_ext_binsearch_idx function in src/ext4_extent.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by supplying a specially crafted ext4 filesystem image. The vulnerability occurs due to insufficient validation of extent header fields before performing a binary search over extent index entries, which can result in invalid pointer calculations and an out-of-bounds memory read during extent tree traversal.

Frequently asked questions

What is CVE-2025-70101?: An out-of-bounds read in the ext4_ext_binsearch_idx function in src/ext4_extent.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by supplying a specially crafted ext4 filesystem image. The vulnerability occurs due to insufficient validation of extent header fields before performing a binary search over extent index entries, which can result in invalid pointer calculations and an out-of-bounds memory read during extent tree traversal.
How severe is CVE-2025-70101?: CVE-2025-70101 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-70101 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-70101?: CVE-2025-70101 affects Gkostka Lwext4. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-70101?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-70101 have an EU (EUVD) identifier?: Yes. CVE-2025-70101 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-210055.
When was CVE-2025-70101 published?: CVE-2025-70101 was published on 2026-06-03 and last updated on 2026-06-29.

References

Affected products (1)

cpe:2.3:a:gkostka:lwext4:1.0.0:*:*:*:*:*:*:*

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