Answer in brief
CVE-2026-98929 records a Unknown severity vulnerability in macsec: initialize SecY before registering the netdevice. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <2b42adf3b8ee9a0e1d2629aca3c5a02a1c438066 || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <b07bea42bf590edb0fd507ab25622a74af09548b || >=c09440f7dcb304002dfced8c0fea289eb25f2da0 <c2de369c5c5b8599ca10fd5ca8d11fcd845c1331 | 2b42adf3b8ee9a0e1d2629aca3c5a02a1c438066, b07bea42bf590edb0fd507ab25622a74af09548b, c2de369c5c5b8599ca10fd5ca8d11fcd845c1331 |
| Linux/Linuxgeneric | 4.6 | Not reported |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
In the Linux kernel, the following vulnerability has been resolved: macsec: initialize SecY before registering the netdevice Creating a MACsec device with MAC offload over an LRO-capable lower device triggers a warning in rtmsg_ifinfo_build_skb() when IPv4 forwarding is enabled by default. register_netdevice() invokes inetdev_init(), which disables LRO and emits a NETDEV_FEAT_CHANGE notification. This reaches macsec_fill_info() before macsec_add_dev() initializes the SecY. key_len is still zero, so macsec_fill_info() returns -EMSGSIZE and trips the WARN_ON in rtmsg_ifinfo_build_skb(), even though the skb has enough space. Even without the warning, notifications during registration can report uninitialized SecY attributes, including the SCI. This ordering has existed since the driver was introduced. Initialize the SecY and apply the new-link attributes before registration. Move MAC address inheritance into macsec_newlink() so the SCI can also be initialized before registration-time notifications report it. Move the per-CPU statistics and metadata destination allocation into ndo_init(), and release partial allocations on failure.
Quoted source text, attributed separately from HOL analysis.