CVE-2026-74667 (GCVE-0-2026-74667)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-10-16 19:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/packet: reset the MAC header on the packet-socket transmit path packet_parse_headers() resets the MAC header only for a SOCK_RAW frame whose socket did not bind a protocol. A protocol-bound SOCK_RAW socket, any SOCK_DGRAM frame, and the legacy SOCK_PACKET path therefore leave skb->mac_header unset here. For frames sent via __dev_queue_xmit() this is harmless: it resets the MAC header unconditionally. But the packet-socket PACKET_QDISC_BYPASS path uses dev_direct_xmit(), which does not, so the frame reaches ndo_start_xmit() with the MAC header unset. A driver that reads eth_hdr(skb) on transmit then dereferences skb->head + (u16)~0, an out-of-bounds access ~64 KiB past the head -- the same class fixed for one consumer in commit f5089008f90c ("macsec: do not read an unset MAC header in macsec_encrypt()"). packet_parse_headers() runs only on the transmit path, where skb->data points at the start of the L2 header for every packet-socket type regardless of its length: SOCK_RAW and SOCK_PACKET carry a user-supplied header and SOCK_DGRAM has one built by dev_hard_header(). Reset the MAC header unconditionally, mirroring __dev_queue_xmit(), so the frame is anchored on the bypass path too. Found by 0sec (https://0sec.ai) using automated source analysis; verified against source and matched to the macsec KASAN report in f5089008f90c. Compile-tested.
References
Impacted products
Vendor Product Version
Linux Linux Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
Version: 75c65772c3d18447d62d3aca5f91b06c16cc25e4
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A driver that reads\\neth_hdr(skb) on transmit then dereferences skb-\u003ehead + (u16)~0, an\\nout-of-bounds access ~64 KiB past the head -- the same class fixed for\\none consumer in commit f5089008f90c (\\\"macsec: do not read an unset MAC\\nheader in macsec_encrypt()\\\").\\n\\npacket_parse_headers() runs only on the transmit path, where skb-\u003edata\\npoints at the start of the L2 header for every packet-socket type\\nregardless of its length: SOCK_RAW and SOCK_PACKET carry a user-supplied\\nheader and SOCK_DGRAM has one built by dev_hard_header(). Reset the MAC\\nheader unconditionally, mirroring __dev_queue_xmit(), so the frame is\\nanchored on the bypass path too.\\n\\nFound by 0sec (https://0sec.ai) using automated source analysis;\\nverified against source and matched to the macsec KASAN report in\\nf5089008f90c. 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\"https://git.kernel.org/stable/c/c2707480cfbf19c7619acc9c089d17f20869821f\"}], \"title\": \"net/packet: reset the MAC header on the packet-socket transmit path\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-74667\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T19:14:14.644201Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T19:14:15.334Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74667\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-08-15T05:44:03.924Z\", \"datePublished\": \"2026-08-22T15:32:38.862Z\", \"dateUpdated\": \"2026-10-16T19:16:08.261Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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