CVE-2026-98929 (GCVE-0-2026-98929)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:08 – Updated: 2026-10-23 12:08
VLAI
Title
macsec: initialize SecY before registering the netdevice
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c09440f7dcb304002dfced8c0fea289eb25f2da0 , < 2b42adf3b8ee9a0e1d2629aca3c5a02a1c438066 (git)
Affected: c09440f7dcb304002dfced8c0fea289eb25f2da0 , < b07bea42bf590edb0fd507ab25622a74af09548b (git)
Affected: c09440f7dcb304002dfced8c0fea289eb25f2da0 , < c2de369c5c5b8599ca10fd5ca8d11fcd845c1331 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacsec: initialize SecY before registering the netdevice\n\nCreating a MACsec device with MAC offload over an LRO-capable lower\ndevice triggers a warning in rtmsg_ifinfo_build_skb() when IPv4\nforwarding is enabled by default.\n\nregister_netdevice() invokes inetdev_init(), which disables LRO and emits\na NETDEV_FEAT_CHANGE notification. This reaches macsec_fill_info() before\nmacsec_add_dev() initializes the SecY. key_len is still zero, so\nmacsec_fill_info() returns -EMSGSIZE and trips the WARN_ON in\nrtmsg_ifinfo_build_skb(), even though the skb has enough space.\n\nEven without the warning, notifications during registration can report\nuninitialized SecY attributes, including the SCI. This ordering has existed\nsince the driver was introduced.\n\nInitialize the SecY and apply the new-link attributes before registration.\nMove MAC address inheritance into macsec_newlink() so the SCI can also be\ninitialized before registration-time notifications report it. Move the\nper-CPU statistics and metadata destination allocation into ndo_init(),\nand release partial allocations on failure."
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    "dateReserved": "2026-09-25T10:25:14.380Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacsec: initialize SecY before registering the netdevice\n\nCreating a MACsec device with MAC offload over an LRO-capable lower\ndevice triggers a warning in rtmsg_ifinfo_build_skb() when IPv4\nforwarding is enabled by default.\n\nregister_netdevice() invokes inetdev_init(), which disables LRO and emits\na NETDEV_FEAT_CHANGE notification. This reaches macsec_fill_info() before\nmacsec_add_dev() initializes the SecY. key_len is still zero, so\nmacsec_fill_info() returns -EMSGSIZE and trips the WARN_ON in\nrtmsg_ifinfo_build_skb(), even though the skb has enough space.\n\nEven without the warning, notifications during registration can report\nuninitialized SecY attributes, including the SCI. This ordering has existed\nsince the driver was introduced.\n\nInitialize the SecY and apply the new-link attributes before registration.\nMove MAC address inheritance into macsec_newlink() so the SCI can also be\ninitialized before registration-time notifications report it. Move the\nper-CPU statistics and metadata destination allocation into ndo_init(),\nand release partial allocations on failure."
          }
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}



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