CVE-2025-39795

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-09-12. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

block: avoid possible overflow for chunk_sectors check in blk_stack_limits()

In blk_stack_limits(), we check that the t->chunk_sectors value is a multiple of the t->physical_block_size value.

However, by finding the chunk_sectors value in bytes, we may overflow the unsigned int which holds chunk_sectors, so change the check to be based on sectors.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
5.1%
KEV
Not listed

Published

September 12, 2025

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated Jul 19, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4328-1] linux-6.1 security update

https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
generic Patch Available

[SECURITY] [DLA 4327-1] linux security update

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8b3ce085b52e674290cbfdd07034e7653ffbe4dc
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/46aa80ef49594ed7de685ecbc673b291e9a2c159
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/448dfecc7ff807822ecd47a5c052acedca7d09e8
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/418751910044649baa2b424ea31cce3fc4dcc253
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3b9d69f0e68aa6b0acd9791c45d445154a8c66e9
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/31f2f080898e50cbf2bae62d35f9f2a997547b38
generic

block: avoid possible overflow for chunk_sectors check in blk_stack_limits() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/14beeef4aafecc8a41de534e31fb5be94739392f

Vendor Advisories for CVE-2025-39795(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(26)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1043.44) @ noble2026-05-21ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1047.50+fips1) @ noble2026-05-21ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-100.100~22.04.1) @ jammy2026-05-21ubuntu
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1041.42~22.04.1) @ jammy2026-05-21ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-100.100+fips1) @ noble2026-05-21ubuntu
ubuntulinux-tools-realtime-6.8.1 (6.8.1-1041.42) @ noble2026-05-21ubuntu
ubuntulinux-tools-gcp-edge (6.8.0-1047.50~22.04.2) @ jammy2026-05-21ubuntu
ubuntulinux-tools-gke-64k-6.8 (6.8.0-1043.48) @ noble2026-05-21ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-100.100.1) @ noble2026-05-21ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1046.49.1) @ noble2026-05-21ubuntu
ubuntulinux-tools-ibm-lts-24.04 (6.8.0-1044.44) @ noble2026-05-21ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1023.24) @ noble2026-05-21ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1046.52) @ noble2026-05-21ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1046.52+fips1) @ noble2026-05-21ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1051.57~22.04.1) @ jammy2026-05-21ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1061 (5.15.0-1061.65) @ jammy2026-05-21ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1091.89) @ jammy2026-05-21ubuntu
ubuntulinux-tools-realtime-5.15 (5.15.0.1096.100) @ jammy2026-05-21ubuntu
ubuntulinux-tools-gcp-fips-5.15 (5.15.0.1097.87) @ jammy2026-05-21ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1101.86) @ jammy2026-05-21ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1101.99) @ jammy2026-05-21ubuntu
ubuntulinux-tools-gkeop-5.15 (5.15.0.1080.79) @ jammy2026-05-21ubuntu
ubuntulinux-virtual-6.8 (6.8.0-100.100) @ noble2026-05-21ubuntu
ubuntulinux-tools-kvm-5.15 (5.15.0.1089.85) @ jammy2026-05-21ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1102.111~20.04.1) @ focal2026-05-21ubuntu
linuxKernel @ 5.10.241—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(24)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 117 total refreshes for this CVE.

  1. 2026-07-23 02:55 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
  3. 2026-07-22 14:07 UTCEPSS rescore
  4. 2026-07-21 15:24 UTCEPSS rescore
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  15. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  16. 2026-07-14 13:11 UTCMITRE cvelistV5
  17. 2026-07-13 22:29 UTCEPSS rescore
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  23. 2026-07-10 06:53 UTCOSV refresh
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  27. 2026-06-21 16:42 UTCOSV refresh
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-39795?
CVE-2025-39795 is a medium vulnerability published on September 12, 2025. In the Linux kernel, the following vulnerability has been resolved: block: avoid possible overflow for chunksectors check in blkstack_limits() In blkstacklimits(), we check that the t->chunk_sectors value is a multiple of the t->physicalblocksize value. However, by finding the chunk_sectors value…
When was CVE-2025-39795 disclosed?
CVE-2025-39795 was first published in the National Vulnerability Database on September 12, 2025, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-39795 actively exploited?
CVE-2025-39795 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-39795?
CVE-2025-39795 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-39795?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-39795, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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