In the Linux kernel, the following vulnerability has been resolved:
serial: caif: hold tty->link reference in ldisc_open and ser_release
A reproducer triggers a KASAN slab-use-after-free in pty_write_room() when caif_serial's TX path calls tty_write_room(). The faulting access is on tty->link->port.
Hold an extra kref on tty->link for the lifetime of the caif_serial line discipline: get it in ldisc_open() and drop it in ser_release(), and also drop it on the ldisc_open() error path.
With this change applied, the reproducer no longer triggers the UAF in my testing.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | May 10, 2026 | May 10, 2026 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1061-raspiUpgrade linux-image-6.8.0-1064-gcp-fipsUpgrade linux-image-generic-6.8Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-nvidia-tegra-igx-rt-5.15Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-gkeop-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-1030-nvidia-tegraUpgrade linux-image-nvidia-tegraUpgrade linux-image-nvidia-tegra-5.15Upgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-genericUpgrade linux-image-intelUpgrade linux-image-azure-6.8Upgrade linux-image-6.8.0-1059-nvidia-64kUpgrade linux-image-6.8.0-1064-gcp-64kUpgrade linux-image-6.8.0-1046-gkeopUpgrade linux-image-6.8.0-136-lowlatencyUpgrade linux-image-generic-64kUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-5.15.0-1106-raspiUpgrade linux-image-azure-fipsUpgrade linux-image-6.8.1-1056-realtimeUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1059-nvidia-lowlatencyUpgrade linux-image-5.15.0-184-lowlatency-64kUpgrade linux-image-5.15.0-1104-intel-iot-realtimeUpgrade linux-image-6.8.0-1061-awsUpgrade linux-image-6.8.0-1059-gkeUpgrade linux-image-fips-6.8Upgrade linux-image-generic-lpaeUpgrade linux-image-nvidiaUpgrade linux-image-generic-64k-6.8Upgrade linux-image-oem-22.04bUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-oem-20.04bUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-oracleUpgrade linux-image-6.8.0-1033-xilinxUpgrade linux-image-aws-64k-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-aws-64kUpgrade linux-image-gke-5.15Upgrade linux-image-raspi-realtimeUpgrade linux-image-generic-5.15Upgrade linux-image-5.15.0-1117-azure-fdeUpgrade linux-image-lowlatencyUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-5.15.0-186-generic-lpaeUpgrade linux-image-aws-lts-22.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-oem-20.04dUpgrade linux-image-fips-5.15Upgrade linux-image-intel-iotg-5.15Upgrade linux-image-kvm-5.15Upgrade linux-image-5.15.0-1112-aws-fipsUpgrade linux-image-nvidia-tegra-igx-5.15Upgrade linux-image-5.15.0-1112-awsUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-lowlatency-64kUpgrade linux-image-gcp-6.8Upgrade linux-image-5.15.0-186-genericUpgrade linux-image-azure-fips-6.8Upgrade linux-image-5.15.0-1112-gcpUpgrade linux-image-azure-lts-24.04Upgrade linux-image-xilinxUpgrade linux-image-5.15.0-1104-kvmUpgrade linux-image-5.15.0-1111-realtimeUpgrade linux-image-fipsUpgrade linux-image-ibmUpgrade linux-image-gcpUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1059-nvidia-lowlatency-64kUpgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-azure-lts-22.04Upgrade linux-image-ibm-6.8Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-gkeopUpgrade linux-image-oem-22.04Upgrade linux-image-aws-64k-5.15Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-6.8.0-1058-oracle-64kUpgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-22.04aUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-5.15.0-186-generic-64kUpgrade linux-image-gcp-64kUpgrade linux-image-5.15.0-1107-nvidiaUpgrade linux-image-azure-fips-5.15Upgrade linux-image-5.15.0-1106-ibmUpgrade linux-image-5.15.0-1095-gkeopUpgrade linux-image-5.15.0-1053-nvidia-tegra-igx-rtUpgrade linux-image-realtime-6.8.1Upgrade linux-image-oem-20.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1063-azureUpgrade linux-image-5.15.0-184-lowlatencyUpgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-oem-22.04cUpgrade linux-image-aws-lts-24.04Upgrade linux-image-oracle-5.15Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-5.15.0-1108-gkeUpgrade linux-image-lowlatency-5.15Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-azureUpgrade linux-image-6.8.0-1059-nvidiaUpgrade linux-image-5.15.0-1064-nvidia-tegraUpgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-xilinx-6.8Upgrade linux-image-nvidia-tegra-rt-5.15Upgrade linux-image-oracle-64kUpgrade linux-image-5.15.0-1107-intel-iotgUpgrade linux-image-5.15.0-1075-xilinx-zynqmpUpgrade linux-image-azure-fde-5.15Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gkeUpgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-6.8.0-1061-aws-fipsUpgrade linux-image-6.8.0-1059-gke-64kUpgrade linux-image-5.15.0-1117-azure-fipsUpgrade linux-image-5.15.0-1117-azureUpgrade linux-image-virtual-5.15Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-gcp-5.15Upgrade linux-image-azure-fde-6.8Upgrade linux-image-aws-fips-6.8Upgrade linux-image-aws-fips-5.15Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-5.15.0-1107-nvidia-lowlatencyUpgrade linux-image-6.8.0-1064-gcpUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-generic-lpae-5.15Upgrade linux-image-azure-cvmUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-136-fipsUpgrade linux-image-6.8.0-1030-nvidia-tegra-rtUpgrade linux-image-5.15.0-1109-oracleUpgrade linux-image-5.15.0-1064-nvidia-tegra-rtUpgrade linux-image-raspi-6.8Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-nvidia-5.15Upgrade linux-image-intel-iotgUpgrade linux-image-gcp-fips-5.15Upgrade linux-image-azure-5.15Upgrade linux-image-realtime-5.15Upgrade linux-image-oracle-lts-22.04Upgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-laptop-23.10Upgrade linux-image-kvmUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-136-lowlatency-64kUpgrade linux-image-gke-64k-6.8Upgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-6.8.0-2050-raspi-realtimeUpgrade linux-image-5.15.0-186-fipsUpgrade linux-image-awsUpgrade linux-image-virtual-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-136-genericUpgrade linux-image-6.8.0-1063-azure-fipsUpgrade linux-image-6.8.0-1058-oracleUpgrade linux-image-5.15.0-1053-nvidia-tegra-igxUpgrade linux-image-5.15.0-1112-gcp-fipsUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-tegra-igxUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-gkeop-5.15Upgrade linux-image-gke-64kUpgrade linux-image-ibm-5.15Upgrade linux-image-raspiUpgrade linux-image-gke-6.8Upgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-6.8.0-1061-ibmUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-realtimeUpgrade linux-image-raspi-5.15Upgrade linux-image-oracle-6.8Upgrade linux-image-oem-20.04cUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-lowlatency-6.8Upgrade linux-image-generic-64k-5.15Upgrade linux-image-gcp-fipsUpgrade linux-image-aws-5.15Upgrade linux-image-6.8.0-1061-aws-64kUpgrade linux-image-5.15.0-1112-aws-64k | Jul 20, 2026 | May 8, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 12, 2026 | May 8, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub