Use-after-free in Linux kernel USB serial port teardown
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 subsystem contains a use-after-free flaw during port tear down. Some drivers for multiport devices read port driver data from completion handlers of shared URBs, and a simple NULL check does not stop these handlers from racing with port tear down.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
In the Linux kernel, the following vulnerability has been resolved: USB: serial: fix port tear down use-after-free Some drivers for multiport devices access port driver data from completion handlers of shared URBs submitted at attach() or first open() and stopped at disconnect() or last close(), respectively. A simple NULL check before accessing the driver data makes sure that a port state container has at least been allocated, but a completion handler can still race with port tear down. Reorder the disconnect handling so that ports are not deregistered (and their driver data freed) until after all ports have been hung up and the driver disconnect() callback has run so that all I/O has been stopped.
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 | 2.6.30 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 2.6.30 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
The Linux kernel is fixed in versions 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10 and 7.3, and in the git commits listed for the affected ranges. Red Hat has no fix planned for Red Hat Enterprise Linux 6 and lists no available fix for Red Hat Enterprise Linux 7, 8, 9 and 10 or Red Hat OpenShift Container Platform 4 and 5.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- 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-2026-98772
- 2026-10-18 Alias added: GHSA-39q3-pw49-mrvf
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Fix available: Linux/[email protected], Linux/Linux@e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c · 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 Fix available: Linux/[email protected], Linux/[email protected], Linux/[email protected] +3 · CNA
- 2026-10-30 3 new references · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/8ed69d299b9d7872f911f089e00cdd2ea6969d2c
- https://git.kernel.org/stable/c/bf296d7b75bfd49dc519ad0406e89ddc5c3f02e3
- https://git.kernel.org/stable/c/94601d83fc4811485ca6fb1d50bece589fe1c24d
- https://git.kernel.org/stable/c/e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c
- https://git.kernel.org/stable/c/60cc9379c3e650d1ebfba4de63f1242537a62a32
- https://git.kernel.org/stable/c/5e8980a81af195c49084be5b4c031085b56c7443
- https://git.kernel.org/stable/c/e80ee74206f260eb1282e7d1339ff146a4a410d0
- https://git.kernel.org/stable/c/33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b
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Sources
- CVE-2026-98772 · CVE Program
- CVE-2026-98772 · NVD
- FIRST EPSS
- GHSA-39q3-pw49-mrvf · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98772 · 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