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NVD / CVE Program· CNA Linux

CVE-2026-90279: md/raid5: round bitmap stripes with sector division

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 02c10581866d08822c6348e299881485fc546185, 17ea021ae74987d6064c8195c4922fa025753892, 6.12.110; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 02c10581866d08822c6348e299881485fc546185, 17ea021ae74987d6064c8195c4922fa025753892, 6.12.110; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: md/raid5: round bitmap stripes with sector division raid5_bitmap_sector_map() aligns the array range to full RAID5 stripe widths before converting it to component sectors. That width is chunk_sectors multiplied by the number of data disks, and it is not always a power of two. Reproduce with a 4-disk RAID5, 1024-sector chunks, and three data disks. The full-stripe width is 3072 sectors. For a one-sector write at array sector 3072, correct rounding gives array range [3072, 6144), which maps to component range [1024, 2048). The old round_down()/round_up() logic instead gives [1024, 4096), which maps to [0, 1024). Use sector_div() based arithmetic so the rounded range is aligned to the actual RAID5 stripe width. The deterministic mapper test now reports the fixed component range as [1024, 2048), while the old mask-based range was [0, 1024).

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 9th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • a41a0df5d7638acf15e723ad985980b4f7ff9383, 6.14affected
    • b29e6400be51c214a0ad30dce937348b57abe33a and later · before 9d7490007707f90691911385365bd1d691d99225affected · git
    • aa8e15d69f5c0044d5bff61844e163aacc4ac172 and later · before cab7d949b18b2f1cd625689dc16c5f81236bac93affected · git
    • 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb and later · before 02c10581866d08822c6348e299881485fc546185affected · git
    • 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb and later · before ccbdc483eb041eef809e9ff223d1ad63518a2c52affected · git
    • 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb and later · before 17ea021ae74987d6064c8195c4922fa025753892affected · git
    • 6.6.79 and later · before 6.6.157affected · semver
    • 6.12.13 and later · before 6.12.110affected · semver
    • 6.13.2 and later · before 6.14affected · semver
    • before 6.14not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90277Sep 17, 2026 · md/md-llbitmap: prevent create failure bitmap UAF
    0Monitor
  • ← EarlierCVE-2026-90278Sep 17, 2026 · md: wait for behind writes before destroying bitmap
    0Monitor
  • Later →CVE-2026-90280Sep 17, 2026 · phy: qcom: qmp-usb: Fix possible NULL-deref on early runtime suspend
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux02c10581866d08822c6348e299881485fc546185Vendor (CNA)
Linux Linux17ea021ae74987d6064c8195c4922fa025753892Vendor (CNA)
Linux Linux6.12.110Vendor (CNA)
Linux Linux6.14Vendor (CNA)
Linux Linux6.6.157Vendor (CNA)
Linux Linux9d7490007707f90691911385365bd1d691d99225Vendor (CNA)
Linux Linuxcab7d949b18b2f1cd625689dc16c5f81236bac93Vendor (CNA)
Linux Linuxccbdc483eb041eef809e9ff223d1ad63518a2c52Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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