net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir

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Summary

CVECVE-2026-53014
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: net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir In tcf_blockcast_redir(), when iterating block ports to redirect packets to multiple devices, the mac_header_xmit flag is queried from the wrong device. The loop sends to dev_prev but queries dev_is_mac_header_xmit(dev) — which is the NEXT device in the iteration, not the one being sent to. This causes tcf_mirred_to_dev() to make incorrect decisions about whether to push or pull the MAC header. When the block contains mixed device types (e.g., an ethernet veth and a tunnel device), intermediate devices get the wrong mac_header_xmit flag, leading to skb header corruption. In the worst case, skb_push_rcsum with an incorrect mac_len can exhaust headroom and panic. The last device in the loop is handled correctly (line 365-366 uses dev_is_mac_header_xmit(dev_prev)), confirming this is a copy-paste oversight for the intermediate devices. Fix by using dev_prev instead of dev for the mac_header_xmit query, consistent with the device actually being sent to.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 42f39036cda808d3de243192a2cf5125f12f3047 8fda5174286119addd28473fb2ec5bdf521c05a8 git Not specified
CNA Linux Linux affected 42f39036cda808d3de243192a2cf5125f12f3047 7db3e4e03032261b1b519341123fc30d995478ca git Not specified
CNA Linux Linux affected 42f39036cda808d3de243192a2cf5125f12f3047 4764953c4b47585eb72797b216b63a831dc0c7e6 git Not specified
CNA Linux Linux affected 42f39036cda808d3de243192a2cf5125f12f3047 4510d140524ca7d6e772db962e013f26f09a63b1 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 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/4510d140524ca7d6e772db962e013f26f09a63b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7db3e4e03032261b1b519341123fc30d995478ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8fda5174286119addd28473fb2ec5bdf521c05a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4764953c4b47585eb72797b216b63a831dc0c7e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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