CVE-2025-40255 - net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()

CVE-2025-40255 - net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()

https://cvefeed.io/rssfeed/latest.atom / Thu, 12/04/2025 - 19:51
CVE ID : CVE-2025-40255
Published : Dec. 4, 2025, 4:16 p.m. | 57 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower() The ethtool tsconfig Netlink path can trigger a null pointer dereference. A call chain such as: tsconfig_prepare_data() -> dev_get_hwtstamp_phylib() -> vlan_hwtstamp_get() -> generic_hwtstamp_get_lower() -> generic_hwtstamp_ioctl_lower() results in generic_hwtstamp_ioctl_lower() being called with kernel_cfg->ifr as NULL. The generic_hwtstamp_ioctl_lower() function does not expect a NULL ifr and dereferences it, leading to a system crash. Fix this by adding a NULL check for kernel_cfg->ifr in generic_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL.
Severity: 0.0 | NA
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