Race with hangup in Linux kernel USB serial ioctls
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 7 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
The Linux kernel USB serial driver is affected from 2.6.26. Its tty ioctls can race with a hangup and call into a driver for a device that is already gone or powered down. A device disconnected during lengthy break signalling causes a NULL pointer dereference. The fix serialises the callbacks with the tty port mutex and checks for hangup before accessing port driver data or hardware.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
Description from the CNA
In the Linux kernel, the following vulnerability has been resolved: USB: serial: fix ioctl hangup race The tty ioctls can race with hangup and end up calling into a tty driver for a device that is already gone or powered down. Serialise the callbacks using the tty port mutex and add the missing checks to make sure the port has not been hung up before accessing port driver data or hardware. This specifically avoids dereferencing a NULL-pointer if a device is disconnected during lengthy break signalling. Note that TIOCGICOUNT and TIOCMIWAIT do not access port driver data or hardware and are therefore not affected by the race.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.26 and later | 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.26 and later Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10, 7.3 Patch available CNA
Remediation
Linux kernel releases 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10 and 7.3 contain the fix. Red Hat Enterprise Linux 6 has no fix planned. Red Hat Enterprise Linux 7, 8, 9 and 10 and Red Hat OpenShift Container Platform 4 and 5 have no fix available.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-18 Threatist record created from CVE-2026-98695
- 2026-10-18 Alias added: GHSA-w8fg-4vmm-x6q5
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Fix available: Linux/Linux@24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0f, Linux/[email protected] · CNA
- 2026-10-21 1 new reference · CNA
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-23 CVSS score added · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-10-30 Fix available: Linux/Linux@3a728adbed9fd822f99a9d9c5ebad5c3b565ba4a, Linux/[email protected], Linux/[email protected] +3 · CNA
- 2026-10-30 3 new references · CNA
References
Other 8
- https://git.kernel.org/stable/c/c7ef25e96dc3f808eb891bbbd43b6a682846eb0c
- https://git.kernel.org/stable/c/98f0a25134bfce44ebd1db0341fa0e8603ff276d
- https://git.kernel.org/stable/c/3a728adbed9fd822f99a9d9c5ebad5c3b565ba4a
- https://git.kernel.org/stable/c/24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0f
- https://git.kernel.org/stable/c/ae0da9a5c1ca95c20cc5feffd511ce6eae75924e
- https://git.kernel.org/stable/c/4597ddd6168ae2a4123404e5f0871f1070dc7773
- https://git.kernel.org/stable/c/7912a95d1345c77d8d63b530b00c118700b78abd
- https://git.kernel.org/stable/c/ae0e61d95677efa778379853e495d748e6efbf95
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- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
Sources
- CVE-2026-98695 · CVE Program
- CVE-2026-98695 · NVD
- FIRST EPSS
- GHSA-w8fg-4vmm-x6q5 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98695 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences