CVE-2026-23359 in Linux Kernel

摘要 (英语)

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.

负责

Linux

预定

2026-01-13

披露

2026-03-25

条目

VulDB provides additional information and datapoints for this CVE:

标识符	漏洞	CWE	可利用	对策	CVE
353093	Linux Kernel get_upper_ifindexes 内存损坏	787	未定义	官方修复	CVE-2026-23359