{"id":"CVE-2026-53013","summary":"macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF\n\nmacvlan_get_size() does not account for IFLA_MACVLAN_BC_CUTOFF, but\nmacvlan_fill_info() conditionally includes it when port-\u003ebc_cutoff != 1.\nThis causes nla_put_s32() to fail with -EMSGSIZE when the netlink skb\nruns out of space, triggering a WARN_ON in rtnetlink and preventing the\ninterface from being dumped.\n\nThe bug can be reproduced with:\n\n  ip link add macvlan0 link eth0 type macvlan mode bridge\n  ip link set macvlan0 type macvlan bc_cutoff 0\n  ip -d link show macvlan0   # fails with -EMSGSIZE\n\nThe bc_cutoff feature was added in commit 954d1fa1ac93 (\"macvlan: Add\nnetlink attribute for broadcast cutoff\"), which added the nla_put_s32()\ncall in macvlan_fill_info() but missed adding the corresponding\nnla_total_size(4) in macvlan_get_size(). A follow-up commit\n55cef78c244d (\"macvlan: add forgotten nla_policy for\nIFLA_MACVLAN_BC_CUTOFF\") fixed the missing nla_policy entry but still\ndid not fix the size calculation.","modified":"2026-07-08T08:13:46.666609473Z","published":"2026-06-24T16:29:23.856Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53013.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53013.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53013"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348"},{"fixed":"4979252758387b338ca968ba7e0515b0ae2257e3"},{"fixed":"77ecfa4e27f282d224215895ddfbeb916fc75e24"},{"fixed":"b6b7154e9f5d75b608ceb2d05b376de8c638c40e"},{"fixed":"1c004f14ccdc11585625c168bb9a7c5e1b8afb0c"},{"fixed":"fa92a77b0ed4d5f11a71665a232ac5a54a4b055d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53013.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.4.0"},{"fixed":"6.6.141"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53013.json"}}],"schema_version":"1.7.5"}