In the Linux kernel, the following vulnerability has been resolved:
s390/netiucv: Fix return type of netiucv_tx()
With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals:
drivers/s390/net/netiucv.c:1854:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = netiucv_tx, ^~~~~~~~~~
->ndo_start_xmit() in 'struct net_device_ops' expects a return type of 'netdev_tx_t', not 'int'. Adjust the return type of netiucv_tx() to match the prototype's to resolve the warning and potential CFI failure, should s390 select ARCH_SUPPORTS_CFI_CLANG in the future.
Additionally, while in the area, remove a comment block that is no longer relevant.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Oct 24, 2025 | Oct 24, 2025 |
| Ubuntu | — | Upgrade linux-azure-fde-5.15Upgrade linux-azure-fipsUpgrade linux-kvmUpgrade linux-raspiUpgrade linux-aws-hweUpgrade linux-riscv-5.15Upgrade linux-aws-5.15Upgrade linux-lowlatencyUpgrade linux-xilinx-zynqmpUpgrade linux-aws-5.4Upgrade linux-oracleUpgrade linux-oracle-5.15Upgrade linux-aws-fipsUpgrade linux-intel-iotgUpgrade linux-oracle-5.4Upgrade linux-gkeopUpgrade linux-intel-iotg-5.15Upgrade linux-fipsUpgrade linux-ibmUpgrade linux-gcp-5.15Upgrade linux-nvidiaUpgrade linux-azure-5.15Upgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-bluefieldUpgrade linuxUpgrade linux-gcp-4.15Upgrade linux-gcpUpgrade linux-lowlatency-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-azure-4.15Upgrade linux-azure-5.4Upgrade linux-hwe-5.4Upgrade linux-hweUpgrade linux-gcp-fipsUpgrade linux-azureUpgrade linux-ibm-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-realtimeUpgrade linux-iotUpgrade linux-awsUpgrade linux-intel-iot-realtimeUpgrade linux-gcp-5.4 | Oct 28, 2025 | Oct 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Oct 22, 2025 |
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