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CVE-2026-98695

Linux: USB: serial: fix ioctl hangup race

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0fAlso 4597ddd6168ae2a4123404e5f0871f1070dc7773, 7912a95d1345c77d8d63b530b00c118700b78abdCVE List
Published18 Oct 2026Updated 21 Oct 2026CVE List

What fixes it

  • 24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0fLinuxCVE List
  • 4597ddd6168ae2a4123404e5f0871f1070dc7773LinuxCVE List
  • 7912a95d1345c77d8d63b530b00c118700b78abdLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 12

  • Linuxaffected: f34d7a5b7010b82fe97da95496b9971435530062 before 24d6edb6bd7f7a9e6cee2f8fe435781daab8aa0fCVE List
  • Linuxaffected: f34d7a5b7010b82fe97da95496b9971435530062 before ae0da9a5c1ca95c20cc5feffd511ce6eae75924eCVE List
  • Linuxaffected: f34d7a5b7010b82fe97da95496b9971435530062 before 4597ddd6168ae2a4123404e5f0871f1070dc7773CVE List
  • Linuxaffected: f34d7a5b7010b82fe97da95496b9971435530062 before 7912a95d1345c77d8d63b530b00c118700b78abdCVE List
  • Linuxaffected: f34d7a5b7010b82fe97da95496b9971435530062 before ae0e61d95677efa778379853e495d748e6efbf95CVE List
  • Linuxaffected: 2.6.26CVE List
  • Linuxunaffected: all versions before 2.6.26CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.56 through 6.18.*CVE List
  • Linuxunaffected: 7.2.10 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5