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

CVE-2026-98872: freevxfs: don't BUG() on unknown typed-extent type

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 1284d687d46953fff9c0d969df108114611aca8b, 405f13d7b270913e06e8e2b4de568985f94ef7d6, 500e9d5bf9eff2096a21b7ac25a0a06ca46ab821; 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 1284d687d46953fff9c0d969df108114611aca8b, 405f13d7b270913e06e8e2b4de568985f94ef7d6, 500e9d5bf9eff2096a21b7ac25a0a06ca46ab821; 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: freevxfs: don't BUG() on unknown typed-extent type vxfs_bmap_typed() handles four typed-extent types and calls BUG() in its default case, so an on-disk typed extent with any other type value crashes the kernel. It is reachable from ioctl(FIBMAP) on a regular file: kernel BUG at fs/freevxfs/vxfs_bmap.c:230! RIP: vxfs_bmap_typed fs/freevxfs/vxfs_bmap.c:230 [inline] vxfs_bmap1+0x128a/0x12d0 fs/freevxfs/vxfs_bmap.c:257 Replace the BUG() with WARN_ON_ONCE() and return 0 -- the value vxfs_bmap_typed() already returns on failure (and from the DEV4 case above); vxfs_getblk() maps 0 to -EIO, so the ioctl fails cleanly.

—No exploit Fix available
Published
Oct 23, 2026
Updated
Oct 26, 2026
EPSS
0.2% · 11th 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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before fe40a19d571cbb584eea46038ee919d8712b2d2caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 500e9d5bf9eff2096a21b7ac25a0a06ca46ab821affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f1f2d54a576f0e4133b979e545abcfefd439c300affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7ada9807e37103b41f586d34e3075e1209182b65affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1284d687d46953fff9c0d969df108114611aca8baffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 405f13d7b270913e06e8e2b4de568985f94ef7d6affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 704d48d81dc41470e108811c32c577ada66192d4affected · 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-2026-98870Oct 23, 2026 · ksmbd: remove stale channels from all sessions on teardown
    35Monitor
  • ← EarlierCVE-2026-98871Oct 23, 2026 · crypto: ccp - Fix possible deadlock in SEV init failure path
    0Monitor
  • Later →CVE-2026-98873Oct 23, 2026 · netfilter: nf_conntrack_expect: zero at allocation time
    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 Linux1284d687d46953fff9c0d969df108114611aca8bVendor (CNA)
Linux Linux405f13d7b270913e06e8e2b4de568985f94ef7d6Vendor (CNA)
Linux Linux500e9d5bf9eff2096a21b7ac25a0a06ca46ab821Vendor (CNA)
Linux Linux704d48d81dc41470e108811c32c577ada66192d4Vendor (CNA)
Linux Linux7ada9807e37103b41f586d34e3075e1209182b65Vendor (CNA)
Linux Linuxf1f2d54a576f0e4133b979e545abcfefd439c300Vendor (CNA)
Linux Linuxfe40a19d571cbb584eea46038ee919d8712b2d2cVendor (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 7, 2026+15 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