How severe is CVE-2025-70100?

CVE-2025-70100 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-70100 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-70100?

CVE-2025-70100 affects Gkostka Lwext4. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-70100?

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

Does CVE-2025-70100 have an EU (EUVD) identifier?

Yes. CVE-2025-70100 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-210054.

When was CVE-2025-70100 published?

CVE-2025-70100 was published on 2026-06-03 and last updated on 2026-06-29.

CVE-2025-70100

CVE-2025-70100 is a medium-severity vulnerability in Gkostka Lwext4 with a CVSS 3.x base score of 5.5. 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-369.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-210054
Weakness: CWE-369
Affected product: Gkostka Lwext4
Published: 2026-06-03
Last modified: 2026-06-29

Description

A divide-by-zero vulnerability in the ext4_block_set_lb_size function in src/ext4_blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or image processing and leads to a Floating-Point Exception (FPE) under sanitizers or a runtime crash in standard builds due to missing validation of lb_size.

Frequently asked questions

What is CVE-2025-70100?: A divide-by-zero vulnerability in the ext4_block_set_lb_size function in src/ext4_blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or image processing and leads to a Floating-Point Exception (FPE) under sanitizers or a runtime crash in standard builds due to missing validation of lb_size.
How severe is CVE-2025-70100?: CVE-2025-70100 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-70100 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-70100?: CVE-2025-70100 affects Gkostka Lwext4. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-70100?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-70100 have an EU (EUVD) identifier?: Yes. CVE-2025-70100 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-210054.
When was CVE-2025-70100 published?: CVE-2025-70100 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:*:*:*:*:*:*:*

More vulnerabilities in Gkostka Lwext4

CVE-2025-70101 — Medium (CVSS 6.5): 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…

All CVEs affecting Gkostka Lwext4 →

Other CWE-369 (Divide By Zero) vulnerabilities

CVE-2021-32494 — Critical (CVSS 10.0): Radare2 has a division by zero vulnerability in Mach-O parser's rebase_buffer function. This allow attackers to create…
CVE-2017-11720 — Critical (CVSS 9.8): There is a division-by-zero vulnerability in LAME 3.99.5, caused by a malformed input file.
CVE-2020-20892 — High (CVSS 8.8): An issue was discovered in function filter_frame in libavfilter/vf_lenscorrection.c in Ffmpeg 4.2.1, allows attackers…
CVE-2025-4637 — High (CVSS 8.7): Divide By Zero vulnerability in davisking dlib allows remote attackers to cause a denial of service via a crafted…
CVE-2026-37232 — High (CVSS 8.6): An issue was discovered in OpenAirInterface5G 2.4.0 (nr-softmodem) in the E2SM-KPM RAN Function's PRB utilization…
CVE-2024-26945 — High (CVSS 8.4): In the Linux kernel, the following vulnerability has been resolved: crypto: iaa - Fix nr_cpus < nr_iaa case If…

Browse all CWE-369 (Divide By Zero) vulnerabilities →