VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98763: Linux kernel · usb: core: clear both ep_in and ep_out for non-ep0 control endpoints

Source GCVE Database

Authoritative record:CVE-2026-98763· Medium

Not known to be exploited · fixed in c50413ecb662ea43c7f487632c8114721743a277 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 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 c50413ecb662ea43c7f487632c8114721743a277, 198d74dcfa129523125f46a89479d3b446b17dbe, 7a9f61476b0e8002092a52ee8295edeeb0a28d1e +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-f752-7j6x-76w7

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c50413ecb662ea43c7f487632c8114721743a277	Fixed in c50413ecb662ea43c7f487632c8114721743a277
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 198d74dcfa129523125f46a89479d3b446b17dbe	Fixed in 198d74dcfa129523125f46a89479d3b446b17dbe
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7a9f61476b0e8002092a52ee8295edeeb0a28d1e	Fixed in 7a9f61476b0e8002092a52ee8295edeeb0a28d1e
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1da16c46b8d7101b74bc2d72a04e23cf5c7ddea1	Fixed in 1da16c46b8d7101b74bc2d72a04e23cf5c7ddea1
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0e8baa78d872f2db440d8b9ded946ab8dceb89eb	Fixed in 0e8baa78d872f2db440d8b9ded946ab8dceb89eb
LinuxLinux	Affected =2.6.12	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to clear both ep_in and ep_out pointers when disabling non-ep0 control endpoints with reset_hardware set. Users should update to a Linux kernel version that includes this patch. Since the vulnerability is resolved in the kernel source, applying the official kernel update is the recommended mitigation.

Description

A vulnerability in the Linux kernel's USB core was resolved by ensuring that both input and output endpoint pointers are cleared when disabling non-ep0 control endpoints. Previously, only one direction was cleared, potentially leaving stale pointers to disabled or freed endpoints. This fix prevents possible inconsistencies in USB endpoint management.

Impact

The issue could lead to stale pointers referencing disabled or freed USB endpoints, which might cause kernel instability or memory corruption. However, no known exploits in the wild have been reported. The impact is limited to USB endpoint management within the Linux kernel.

Summary

The vulnerability involved the usb_disable_endpoint() function in the Linux kernel USB core, which failed to clear both dev->ep_in[epnum] and dev->ep_out[epnum] pointers for non-zero control endpoints when reset_hardware was set. This could leave one direction's endpoint pointer referencing a disabled or freed endpoint, potentially causing use-after-free or stale pointer issues. The patch updates usb_disable_endpoint() to clear both pointers and adjusts documentation accordingly. Testing was performed on Linux 7.3.0-rc3 with QEMU using dummy_hcd and raw-gadget to verify the fix.

References

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