CVE-2022-50564 Details
Description
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.
A vulnerability exists in the Linux kernel's NetIUCV driver, specifically within the network device operations. The issue arises from an incompatible return type in the 'netiucv_tx' function, which is assigned to the 'ndo_start_xmit' field of 'struct net_device_ops'. This mismatch can lead to runtime errors, such as a kernel panic or the termination of a thread. The problem is exacerbated when the kernel is compiled with Clang's control flow integrity (kCFI) enabled, as this configuration expects function pointer types to match precisely. The vulnerability affects several versions of the Linux kernel.
Users can address this vulnerability by updating to a patched version of the Linux kernel where the NetIUCV driver's 'netiucv_tx' function return type has been corrected to match the expected prototype. Instructions for downloading the latest stable kernel version can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 22, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/3ac0217ca9186c2f9af9a0113a331a42aa847894 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/4bee3c75d5bf7c2b5dc0b520410eb40449e5da31 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/85d392710275355425df8618ccbebbc336f5acc5 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/88d86d18d7cf7e9137c95f9d212bb9fff8a1b4be | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/d034fa43af92fc46a81d882f46d9cc3e4ffdbbcc | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/dfbf0122ea1b9b3e73fa22c8ff6bd888935c54fc | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/e7a849f740e3576e79cba403697e916f4c3a6f12 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/eccc88c0efe407e579291792ad07a7dedc0f63f0 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/f13d870fce90f01cf930bfaffecc8185ae0be21c | kernel.org | Source CodeVendor |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
| Product | Versions |
|---|---|
| Linux kernel | All versions |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Oct 22, 2025 | New CVE Received | kernel.org |