{"id":"CVE-2026-23359","summary":"bpf: Fix stack-out-of-bounds write in devmap","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stack-out-of-bounds write in devmap\n\nget_upper_ifindexes() iterates over all upper devices and writes their\nindices into an array without checking bounds.\n\nAlso the callers assume that the max number of upper devices is\nMAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack,\nbut that assumption is not correct and the number of upper devices could\nbe larger than MAX_NEST_DEV (e.g., many macvlans), causing a\nstack-out-of-bounds write.\n\nAdd a max parameter to get_upper_ifindexes() to avoid the issue.\nWhen there are too many upper devices, return -EOVERFLOW and abort the\nredirect.\n\nTo reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with\nan XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS.\nThen send a packet to the device to trigger the XDP redirect path.","modified":"2026-04-14T03:47:51.163878Z","published":"2026-03-25T10:27:43.070Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23359.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5000e40acc8d0c36ab709662e32120986ac22e7e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a95fb9df1105b1618872c2846a6c01e3ba20b45"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7bf516c3ecd9a2aae2dc2635178ab87b734fef1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca831567908fd3f73cf97d8a6c09a5054697a182"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2c31d8e03d05edc16656e5ffe187f0d1da763d7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23359.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23359"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"aeea1b86f9363f3feabb496534d886f082a89f21"},{"fixed":"5000e40acc8d0c36ab709662e32120986ac22e7e"},{"fixed":"8a95fb9df1105b1618872c2846a6c01e3ba20b45"},{"fixed":"d2c31d8e03d05edc16656e5ffe187f0d1da763d7"},{"fixed":"75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2"},{"fixed":"ca831567908fd3f73cf97d8a6c09a5054697a182"},{"fixed":"b7bf516c3ecd9a2aae2dc2635178ab87b734fef1"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-23359.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.77"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.17"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-23359.json"}}],"schema_version":"1.7.5"}