Use-after-free in Linux kernel TTY termios reset race
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: 1 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
The Linux kernel TTY layer has a race condition in its saved termios handling. Closing a TTY while its device is re-registered with a reused minor number can lead to a use-after-free. The fix adds a TTY_DRIVER_RESET_SAVED_TERMIOS flag that resets saved termios state on registration. Only drivers that ensure the minor number is no longer in use set it.
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: tty: fix saved termios reset race Resetting saved termios state on device registration is needed where a minor number can be reused for an entirely different device and where the old settings may prevent the port from even being opened (e.g. when CLOCAL is not set). Not all TTY drivers guarantee that the minor number is no longer in use when registering devices however, something which can lead to a use-after-free when closing a TTY (and saving its termios) races with re-registration. Add a new TTY_DRIVER_RESET_SAVED_TERMIOS flag to request that any saved termios state is reset on registration and only set it for drivers that make sure that the minor number is no longer in use.
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 | 4.12 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 4.12 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 fix is included in Linux kernel 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. Red Hat lists Red Hat Enterprise Linux 10 as affected with 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 |
Timeline
- 2026-10-18 Threatist record created from CVE-2026-98750
- 2026-10-18 Alias added: GHSA-447r-jv65-jrgx
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Affected versions changed · Red Hat
- 2026-10-21 CVSS score added · Red Hat
- 2026-10-21 Fix available: Linux/[email protected], Linux/Linux@6b4e15cccfbe03b7c6ae60ff570c401bfb1e51d6 · CNA
- 2026-10-21 1 new reference · CNA
- 2026-10-30 Fix available: Linux/Linux@15ddaf908a8eee14e1872ff9c4cdb73562634e7e, Linux/Linux@33048616c4e22930e8769b8d14ee8a0dc5a80ceb, Linux/[email protected] +3 · CNA
- 2026-10-30 3 new references · CNA
References
Other 8
- https://git.kernel.org/stable/c/15ddaf908a8eee14e1872ff9c4cdb73562634e7e
- https://git.kernel.org/stable/c/bcb9b5df70d439f3c9d5a2d7f359dd7ab117bee0
- https://git.kernel.org/stable/c/33048616c4e22930e8769b8d14ee8a0dc5a80ceb
- https://git.kernel.org/stable/c/6b4e15cccfbe03b7c6ae60ff570c401bfb1e51d6
- https://git.kernel.org/stable/c/1572d86bcf0bcb848d20fc5e5de7ed6963034c2b
- https://git.kernel.org/stable/c/08bf919f041af9de372428bb0c938157ea144164
- https://git.kernel.org/stable/c/dcaf0251f847a45861e94c6617024a9455687d2f
- https://git.kernel.org/stable/c/8df07fe93573e9e548d6645273e9bcb6eb74059e
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Sources
- CVE-2026-98750 · CVE Program
- CVE-2026-98750 · NVD
- FIRST EPSS
- GHSA-447r-jv65-jrgx · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98750 · Red Hat security data · CC BY 4.0
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