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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98879: isofs: handle set_blocksize failures

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32, 28d1f6aa14f5924e36602b7a31c9141d34de0b9c, 61f277bf35f533b602984f0e55900111fe52f31a; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32, 28d1f6aa14f5924e36602b7a31c9141d34de0b9c, 61f277bf35f533b602984f0e55900111fe52f31a; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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: isofs: handle set_blocksize failures isofs uses buffer_heads, which don't handle block size > PAGE_SIZE well. Without this, mounting we will hit the BUG_ON(offset >= folio_size(folio)); in folio_set_bh on the first __bread_gfp call.

—No exploit Fix available
Published
Oct 23, 2026
Updated
Oct 26, 2026
EPSS
0.1% · 7th 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 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-98879

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6db7f0ba365786304558db6a3d52013ae176e03eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 61f277bf35f533b602984f0e55900111fe52f31aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before cebde6d88e34396c29f2f001d90e921677cc17d6affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 28d1f6aa14f5924e36602b7a31c9141d34de0b9caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9c97e3b1152d3092581745189f5d2f04c6404ef9affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9584ab6283721e5aab485c79bd06c2f78d89e55caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32affected · git
    • before 2.6.12not affected · semver
    • 5.10.271 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
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-2026-98877Oct 23, 2026 · irqchip/gic-v4: Don't advertise VLPIs if no ITS is probed
    0Monitor
  • ← EarlierCVE-2026-98878Oct 23, 2026 · irqchip/gic-v5: Immediately exec priority drop following activate
    0Monitor
  • Later →CVE-2026-98880Oct 23, 2026 · ntfs3: handle set_blocksize failures
    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 Linux25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32Vendor (CNA)
Linux Linux28d1f6aa14f5924e36602b7a31c9141d34de0b9cVendor (CNA)
Linux Linux61f277bf35f533b602984f0e55900111fe52f31aVendor (CNA)
Linux Linux6db7f0ba365786304558db6a3d52013ae176e03eVendor (CNA)
Linux Linux9584ab6283721e5aab485c79bd06c2f78d89e55cVendor (CNA)
Linux Linux9c97e3b1152d3092581745189f5d2f04c6404ef9Vendor (CNA)
Linux Linuxcebde6d88e34396c29f2f001d90e921677cc17d6Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 3, 2026+11 d
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

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

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

All records