IT

Tracker / CVE-2026-23359

CVE-2026-23359

High 7.8

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stack-out-of-bounds write in devmap get_upper_ifindexes() iterates over all upper devices and writes their indices into an array without checking bounds. Also the callers assume that the max number of upper devices is MAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack, but that assumption is not correct and the number of upper devices could be larger than MAX_NEST_DEV (e.g., many macvlans), causing a stack-out-of-bounds write. Add a max parameter to get_upper_ifindexes() to avoid the issue. When there are too many upper devices, return -EOVERFLOW and abort the redirect. To reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS. Then send a packet to the device to trigger the XDP redirect path.

Affected products and versions

linux linux_kernel
linux linux_kernel · 5.15.1 → 5.15.203
linux linux_kernel · 5.16 → 6.1.167
linux linux_kernel · 6.13 → 6.18.17
linux linux_kernel · 6.19 → 6.19.7
linux linux_kernel · 6.2 → 6.6.130
linux linux_kernel · 6.7 → 6.12.77

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References