{"id":"CVE-2026-53013","state":"PUBLISHED","title":"macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF","description":"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->bc_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.","publishedAt":"2026-06-24T16:29:23.856Z","updatedAt":"2026-06-24T16:29:23.856Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"4979252758387b338ca968ba7e0515b0ae2257e3","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"77ecfa4e27f282d224215895ddfbeb916fc75e24","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"b6b7154e9f5d75b608ceb2d05b376de8c638c40e","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"1c004f14ccdc11585625c168bb9a7c5e1b8afb0c","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"fa92a77b0ed4d5f11a71665a232ac5a54a4b055d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macvlan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macvlan.c"]}],"references":["https://git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3","https://git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24","https://git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e","https://git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c","https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53013.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53013","state":"PUBLISHED","datePublished":"2026-06-24T16:29:23.856Z","dateUpdated":"2026-06-24T16:29:23.856Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.378Z"},"containers":{"cna":{"title":"macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF","descriptions":[{"lang":"en","value":"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->bc_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"4979252758387b338ca968ba7e0515b0ae2257e3","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"77ecfa4e27f282d224215895ddfbeb916fc75e24","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"b6b7154e9f5d75b608ceb2d05b376de8c638c40e","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"1c004f14ccdc11585625c168bb9a7c5e1b8afb0c","versionType":"git"},{"version":"954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348","status":"affected","lessThan":"fa92a77b0ed4d5f11a71665a232ac5a54a4b055d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macvlan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macvlan.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3"},{"url":"https://git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24"},{"url":"https://git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e"},{"url":"https://git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c"},{"url":"https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-24T16:29:23.856Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}