CVE-2026-23359 in Linux Kernel

Zusammenfassung (Englisch)

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.

Zuständig

Linux

Reservieren

13.01.2026

Veröffentlichung

25.03.2026

Einträge

VulDB provides additional information and datapoints for this CVE:

ID	Schwachstelle	CWE	Aus	Mas	CVE
353093	Linux Kernel get_upper_ifindexes Pufferüberlauf	787	Nicht definiert	Offizieller Fix	CVE-2026-23359