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How the CVE Works
The vulnerability exists in the `ixgbe` network driver within the Linux kernel. Its Energy Efficient Ethernet (EEE) feature uses two key data arrays: `ixgbe_ls_map` (link status) and `ixgbe_lp_map` (link partner). Code loops intended to populate the driver’s supported and advertised EEE capability bitmaps incorrectly referenced ixgbe_lp_map[bash]. This was a logic error, as these bitmaps should be populated based on the local device’s link status from ixgbe_ls_map[bash]. Using the wrong map pointer leads to incorrect bits being set in the kernel’s internal EEE state. More critically, `ixgbe_lp_map` and `ixgbe_ls_map` are defined with different sizes for different purposes. Accessing the smaller `ixgbe_lp_map` array with an index meant for the larger `ixgbe_ls_map` can cause an out-of-bounds read. This reads kernel memory beyond the bounds of the intended array. The read value is then used in bitwise operations to configure hardware registers. Corrupted or unexpected memory values can lead to undefined behavior. This could potentially cause a system crash (kernel panic) or lockup. The fix corrects the loops to use `ixgbe_ls_map` for local capabilities. It reserves `ixgbe_lp_map` usage strictly for interpreting the link partner’s advertised capabilities.
DailyCVE Form
Platform: Linux Kernel
Version: With ixgbe driver
Vulnerability : Incorrect map usage
Severity: Medium
date: 2025-10-01
Prediction: Patch released 2025-10
What Undercode Say
`lsmod | grep ixgbe`
`modinfo ixgbe`
`uname -r`
`dmesg | grep -i eee`
How Exploit
Local system access required. Trigger involves querying or negotiating EEE settings via ethtool. Malicious trigger could cause out-of-bounds read. May lead to denial-of-service (system crash).
Protection from this CVE
Update Linux kernel. Apply kernel security patches. Disable EEE feature.
Impact
Kernel memory corruption. System instability or crash. Potential denial-of-service.
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Reported By: nvd.nist.gov
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