macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF

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Summary

CVECVE-2026-53013
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:12 UTC
Updated2026-06-24 17:17:12 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF macvlan_get_size() does not account for IFLA_MACVLAN_BC_CUTOFF, but macvlan_fill_info() conditionally includes it when port->bc_cutoff != 1. This causes nla_put_s32() to fail with -EMSGSIZE when the netlink skb runs out of space, triggering a WARN_ON in rtnetlink and preventing the interface from being dumped. The bug can be reproduced with: ip link add macvlan0 link eth0 type macvlan mode bridge ip link set macvlan0 type macvlan bc_cutoff 0 ip -d link show macvlan0 # fails with -EMSGSIZE The bc_cutoff feature was added in commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff"), which added the nla_put_s32() call in macvlan_fill_info() but missed adding the corresponding nla_total_size(4) in macvlan_get_size(). A follow-up commit 55cef78c244d ("macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF") fixed the missing nla_policy entry but still did not fix the size calculation.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 4979252758387b338ca968ba7e0515b0ae2257e3 git Not specified
CNA Linux Linux affected 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 77ecfa4e27f282d224215895ddfbeb916fc75e24 git Not specified
CNA Linux Linux affected 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 b6b7154e9f5d75b608ceb2d05b376de8c638c40e git Not specified
CNA Linux Linux affected 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 1c004f14ccdc11585625c168bb9a7c5e1b8afb0c git Not specified
CNA Linux Linux affected 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 fa92a77b0ed4d5f11a71665a232ac5a54a4b055d git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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