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

CVE-2026-98170: smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()

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 13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca, 22886b1b7464613373c9a7d0af2ace029c50cd97, 34a3942e787b9c59758115bd65fe1ec89d68c7a4; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca, 22886b1b7464613373c9a7d0af2ace029c50cd97, 34a3942e787b9c59758115bd65fe1ec89d68c7a4; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes 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: fix OOB struct field reads in move_smb2_ea_to_cifs() In move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is insufficient. It allows iteration to continue even if the remaining src_size is too small to contain a complete smb2_ea_info structure. Consequently, reads of ea_name_length and ea_value_length can occur out-of-bounds. Fix this by ensuring src_size >= sizeof(*src) before attempting to read any structure fields. Additionally, reject any next_entry_offset that is smaller than sizeof(*src) or that would advance the pointer beyond the available buffer. Note that for calls where the server returns a malformed EA list, the error returned to userspace changes from -ENODATA (getxattr) or -ERANGE (listxattr) to -EIO. This correctly signals a server protocol error rather than misleadingly indicating "attribute not present" or "output buffer too small".

—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 12th 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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  • No public exploit code on record
  • A fix has been released

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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

    • 4.14affected
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before 22886b1b7464613373c9a7d0af2ace029c50cd97affected · git
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before 9d707a278c100c26d10fbbbd03988778ffc992ceaffected · git
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before 90a13af4c9b1369327395bababfe87c75599cc19affected · git
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before 61812323c037a94e2e7f0db7ee740c34b126bffeaffected · git
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before d3546cecbf81d98bf3b472d341f981eb48c04f47affected · git
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before 34a3942e787b9c59758115bd65fe1ec89d68c7a4affected · git
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before 13efcd37a9b3d6ffa1579c3dda3e29c893ed9bcaaffected · git
    • 95907fea4fd8ccc736e0a428e52159b4d42b9958 and later · before eeb5ef6083e1cefa2ef75041b5597ff228b8d7bbaffected · git
    • before 4.14not 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 7.2.8-17.2.8-1
openSUSE:Tumbleweedkernel-sourcebefore 7.2.10-1.17.2.10-1.1

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-2026-98168Oct 6, 2026 · smb: client: fix reparse buffer bounds in cifs_query_reparse_point()
    0Monitor
  • ← EarlierCVE-2026-98169Oct 6, 2026 · smb: client: fix potential OOB read in smb3_enum_snapshots()
    28Monitor
  • Later →CVE-2026-98171Oct 6, 2026 · smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
    35Monitor

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 Linux13efcd37a9b3d6ffa1579c3dda3e29c893ed9bcaVendor (CNA)
Linux Linux22886b1b7464613373c9a7d0af2ace029c50cd97Vendor (CNA)
Linux Linux34a3942e787b9c59758115bd65fe1ec89d68c7a4Vendor (CNA)
Linux Linux61812323c037a94e2e7f0db7ee740c34b126bffeVendor (CNA)
Linux Linux90a13af4c9b1369327395bababfe87c75599cc19Vendor (CNA)
Linux Linux9d707a278c100c26d10fbbbd03988778ffc992ceVendor (CNA)
Linux Linuxd3546cecbf81d98bf3b472d341f981eb48c04f47Vendor (CNA)
Linux Linuxeeb5ef6083e1cefa2ef75041b5597ff228b8d7bbVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.2.10-1.1 · openSUSE:TumbleweedPackage 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 2, 2026+27 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.

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