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

CVE-2026-98681: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races

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 19465a9aeb664f1d710d0d22c07c31bfb7c85446, 3786ee67658a2c80fef2544e7de2cd329e043cf9, 3b8e7928cf1928555dc05d172dd02fb0e7692ec4; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1.

Low priority for now. Upgrade to Linux Linux 19465a9aeb664f1d710d0d22c07c31bfb7c85446, 3786ee67658a2c80fef2544e7de2cd329e043cf9, 3b8e7928cf1928555dc05d172dd02fb0e7692ec4; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1 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: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 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-2026-98681

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • 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

    • 2.6.32affected
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before f255e87b4f7eda568c37d6eae5db1d1a8aca5968affected · git
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before 7fa619367869be705942f087b2ecd209efc78fe1affected · git
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4caffected · git
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before 3b8e7928cf1928555dc05d172dd02fb0e7692ec4affected · git
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before 3786ee67658a2c80fef2544e7de2cd329e043cf9affected · git
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before 4165641d06ef44f3a31b77a28048b6c737e885e7affected · git
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before d9d23d115610e0342e768f6cb525d91c7b154027affected · git
    • 3bc303c254335dbd7c7012cc1760b12f1d5514d3 and later · before 19465a9aeb664f1d710d0d22c07c31bfb7c85446affected · git
    • before 2.6.32not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.10-17.2.10-1

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-2026-98679Oct 18, 2026 · iio: accel: kxcjk-1013: reject duplicate event disable
    0Monitor
  • ← EarlierCVE-2026-98680Oct 18, 2026 · iio: accel: kionix-kx022a: Prevent memory leak and fix state
    0Monitor
  • Later →CVE-2026-98682Oct 18, 2026 · smb: client: drain and invalidate before server-side copy/clone
    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 Linux19465a9aeb664f1d710d0d22c07c31bfb7c85446Vendor (CNA)
Linux Linux3786ee67658a2c80fef2544e7de2cd329e043cf9Vendor (CNA)
Linux Linux3b8e7928cf1928555dc05d172dd02fb0e7692ec4Vendor (CNA)
Linux Linux4165641d06ef44f3a31b77a28048b6c737e885e7Vendor (CNA)
Linux Linux7fa619367869be705942f087b2ecd209efc78fe1Vendor (CNA)
Linux Linuxd9d23d115610e0342e768f6cb525d91c7b154027Vendor (CNA)
Linux Linuxe961baf9c1a4f2e93a55f8eb2c6151fc27b96a4cVendor (CNA)
Linux Linuxf255e87b4f7eda568c37d6eae5db1d1a8aca5968Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.06.6.161.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 7, 2026+20 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).

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 (7 more)

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

All records