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

CVE-2026-98687: thunderbolt: Reject oversized XDomain properties responses

—No exploit Fix available

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 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa, 37ea4304bd9f57ebe719409f010915495467f05c, 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efa, 37ea4304bd9f57ebe719409f010915495467f05c, 737a1d2e9642d5f718bd29aa4a98b9eef3832f0a; 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: thunderbolt: Reject oversized XDomain properties responses tb_xdp_properties_request() allocates room for 45 data dwords in its 252-byte response buffer. The XDomain length field is six bits wide, however, and a malicious peer can set it to 63. After the fixed response fields are subtracted, the driver treats this as 48 data dwords. Commit 322e93448d90 ("thunderbolt: Clamp XDomain response data copy to allocation size") only bounds the copy against data_len. If data_len is at least 48, memcpy() reads 192 bytes from the 180-byte res->data array, causing a 12-byte heap out-of-bounds read. Commit 4db2bd2ed478 ("thunderbolt: Limit XDomain response copy to actual frame size") limits the earlier copy but does not constrain this header-derived length. Reject response data lengths that exceed the allocated source buffer before copying them into the assembled property block.

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%

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  • A fix has been released

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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

    • 4.15affected
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before 9fba032802b5858bc6186b34f8e966429ff155abaffected · git
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before 7c028d2ae85eca86b82cab1163a9ac1187a2e666affected · git
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before 37ea4304bd9f57ebe719409f010915495467f05caffected · git
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before b270c1074860de74da0d6b5250fb06b359b9d509affected · git
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before a766a86ff48acee76aeb8e2575771040749e509daffected · git
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before 2f97f929dad9eb3e1f63b721d2dd49bf9bc68efaaffected · git
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before 737a1d2e9642d5f718bd29aa4a98b9eef3832f0aaffected · git
    • d1ff70241a275133e1a0258b7c23588b122276c8 and later · before 80756e263846ab694984e749e8c626897331438faffected · git
    • before 4.15not 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-2026-98685Oct 18, 2026 · smb: client: discard post-EOF pagecache when extending a file via clone range
    0Monitor
  • ← EarlierCVE-2026-98686Oct 18, 2026 · smb: client: discard post-EOF pagecache when extending a file via zero range
    0Monitor
  • Later →CVE-2026-98688Oct 18, 2026 · thunderbolt: Fix NULL dereference in tb_remove_work()
    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 Linux2f97f929dad9eb3e1f63b721d2dd49bf9bc68efaVendor (CNA)
Linux Linux37ea4304bd9f57ebe719409f010915495467f05cVendor (CNA)
Linux Linux737a1d2e9642d5f718bd29aa4a98b9eef3832f0aVendor (CNA)
Linux Linux7c028d2ae85eca86b82cab1163a9ac1187a2e666Vendor (CNA)
Linux Linux80756e263846ab694984e749e8c626897331438fVendor (CNA)
Linux Linux9fba032802b5858bc6186b34f8e966429ff155abVendor (CNA)
Linux Linuxa766a86ff48acee76aeb8e2575771040749e509dVendor (CNA)
Linux Linuxb270c1074860de74da0d6b5250fb06b359b9d509Vendor (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: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 13, 2026+26 d
EPSS, last 120 days

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

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.

References

Show all references (7 more)

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

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