VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98762: Linux kernel · USB: dwc2: shut down wakeup timer before freeing HCD state

Source GCVE Database

Authoritative record:CVE-2026-98762

Not known to be exploited · fixed in fd772af9512cdecb83de34a461801533828e77fd : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · 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 fd772af9512cdecb83de34a461801533828e77fd, 4333174ea52c863a50bb3e0a4726bf9f7cdf7524, 441be312fce927443eae2821f502344d953c38bb +2

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.

ghsa-g24x-rpv9-j8mw

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7359d482eb4d3967cc8be354405ae6be6eaf732c, < fd772af9512cdecb83de34a461801533828e77fd	Fixed in fd772af9512cdecb83de34a461801533828e77fd
LinuxLinux	Affected ≥ 7359d482eb4d3967cc8be354405ae6be6eaf732c, < 4333174ea52c863a50bb3e0a4726bf9f7cdf7524	Fixed in 4333174ea52c863a50bb3e0a4726bf9f7cdf7524
LinuxLinux	Affected ≥ 7359d482eb4d3967cc8be354405ae6be6eaf732c, < 441be312fce927443eae2821f502344d953c38bb	Fixed in 441be312fce927443eae2821f502344d953c38bb
LinuxLinux	Affected ≥ 7359d482eb4d3967cc8be354405ae6be6eaf732c, < 82cc242da6d621752718929e6a2fa6f9554ebffe	Fixed in 82cc242da6d621752718929e6a2fa6f9554ebffe
LinuxLinux	Affected ≥ 7359d482eb4d3967cc8be354405ae6be6eaf732c, < 79ba37dd38a321cb32a79332a3e3c68dd334dca9	Fixed in 79ba37dd38a321cb32a79332a3e3c68dd334dca9
LinuxLinux	Affected =3.10	Fixed in–

AI-suggested

A fix has been implemented to stop and shut down the wakeup timer before freeing the HCD state in the dwc2 driver. Users should update to a Linux kernel version that includes this fix. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's USB dwc2 driver was resolved by ensuring the wakeup timer is properly shut down before freeing the host controller driver (HCD) state. The issue involved the dwc2_wakeup_detected() function potentially rearming a timer after the HCD state was freed, due to improper timer deletion sequencing. The fix involves stopping and shutting down the timer in dwc2_hcd_release() before freeing HCD resources, covering both initialization error paths and normal removal.

Impact

The vulnerability could lead to unsafe access to freed resources within the USB dwc2 driver in the Linux kernel, potentially causing system instability or crashes. No known exploits are reported in the wild. The impact is limited to the affected USB driver component and depends on the system's use of the dwc2 USB host controller.

Summary

The vulnerability in the Linux kernel's USB dwc2 driver arises because dwc2_wakeup_detected() can rearm the wakeup timer while the HCD state is still accessible. However, dwc2_hcd_free() deletes the timer only after freeing the host-owned state, and timer_delete() does not synchronize callbacks or prevent the timer from being queued again. This sequencing flaw could lead to use-after-free conditions or other unsafe behavior. The resolution is to stop and shut down the timer earlier in dwc2_hcd_release(), before freeing HCD resources, ensuring no timer callbacks occur after resource release.

References

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