VulnerabilityPublished 18 Oct 2026

CVE-2026-98689: Linux kernel · thunderbolt: Don't access a DP tunnel after its DPRX read was canceled

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3, 405a969c0b3356639116db89ab367be1d64b77c0, 2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to 419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3, 405a969c0b3356639116db89ab367be1d64b77c0 or 2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d6d458d42e1e1544a18f37f1d5c840e00d5261b9, < 419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3	Fixed in 419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3
LinuxLinux	Affected ≥ d6d458d42e1e1544a18f37f1d5c840e00d5261b9, < 405a969c0b3356639116db89ab367be1d64b77c0	Fixed in 405a969c0b3356639116db89ab367be1d64b77c0
LinuxLinux	Affected ≥ d6d458d42e1e1544a18f37f1d5c840e00d5261b9, < 2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6	Fixed in 2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6
LinuxLinux	Affected =6.14	Fixed in–

AI-suggested

A fix is available and has been applied in the Linux kernel commits identified by hashes 419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3, 405a969c0b3356639116db89ab367be1d64b77c0, and 2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6. Users and administrators should update to a Linux kernel version that includes these patches to remediate the issue.

Description

A vulnerability in the Linux kernel's Thunderbolt driver allows access to a DisplayPort (DP) tunnel after its DPRX read operation was canceled. This occurs because the code checks a cancellation flag without proper locking, leading to callbacks on tunnels that have already been torn down during system suspend or disconnect. The issue has been fixed by adding proper locking and flag management to prevent accessing inactive tunnels.

Impact

The vulnerability can cause the kernel to access and operate on a DisplayPort tunnel that has been torn down, potentially leading to use-after-free or invalid memory access conditions during system suspend or device disconnect. This could cause system instability or crashes but no direct exploitation or privilege escalation is described.

Summary

CVE-2026-98689 describes a flaw in the Linux kernel's Thunderbolt driver where tb_dp_dprx_work() checks the dprx_canceled flag before acquiring the tb->lock, missing concurrent tb_dp_dprx_stop() calls that cancel ongoing work. This results in polling DPRX capabilities and invoking callbacks on a DP tunnel that has already been torn down, particularly during suspend or disconnect operations. The vulnerability is triggered when the DPRX read is canceled from outside the ordered workqueue, as seen during suspend with tb_disconnect_and_release_dp() and tb_stop() functions. The fix involves checking the cancellation flag with the lock held, rechecking in tb_dp_tunnel_active(), and clearing the flag appropriately in tb_dp_dprx_start().

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 10:01 UTC

Technical details

References

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