CVE-2026-72019 (GCVE-0-2026-72019)
Vulnerability from cvelistv5
Published
2026-08-15 05:51
Modified
2026-10-19 21:19
Severity ?
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: macsec: don't read an unset MAC header in macsec_encrypt() macsec_encrypt() reads the Ethernet header via eth_hdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the SecTAG. On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb reaches the macsec ndo_start_xmit() with the MAC header unset, so eth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of bounds: a 12-byte heap over-read that is also emitted on the wire as the frame's outer source/destination MAC. KASAN reports a slab-out-of-bounds read in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET build flags it as an unset mac header in skb_mac_header(). On the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added by commit 96cc4b69581d ("macvlan: do not assume mac_header is set in macvlan_broadcast()") for exactly this purpose.
References
Impacted products
Vendor Product Version
Linux Linux Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
Version: c09440f7dcb304002dfced8c0fea289eb25f2da0
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\"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:50:05.685Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72019\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-08-09T03:40:39.900Z\", \"datePublished\": \"2026-08-15T05:51:46.014Z\", \"dateUpdated\": \"2026-10-16T15:53:16.257Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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