CVE-2025-38110 — net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via C45 (clause 45) mdiobus, there is no verification of parameters passed to the ioctl and it accepts any mdio address. Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define, but it is possible to pass higher value than that via ioctl. While read/write operation should generally fail in this case, mdiobus provides stats array, where wrong address may allow out-of-bounds read/write.

Fix that by adding address verification before C45 read/write operation. While this excludes this access from any statistics, it improves security of read/write operation.

RHSA-2025:11245 — Red Hat Security Advisory: kernel security update

kernel: Squashfs: fix handling and sanity checking of xattr_ids count kernel: ipv6: mcast: extend RCU protection in igmp6_send() kernel: net: atm: fix use after free in lec_send() kernel: ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all() kernel: ext4: fix off-by-one error in do_split kernel: ext4: ignore xattrs past end kernel: net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

Most recent entries from all

CVE-2025-38110 — net/mdiobus: Fix potential out-of-bounds clause 45 read/write access

RHSA-2025:11245 — Red Hat Security Advisory: kernel security update