{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.10-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  af_packet: Don't send zero-byte data in tpacket_snd().  syzbot reported a WARNING in __dev_queue_xmit() triggered via tpacket_snd():  skb_assert_len WARNING: at include/linux/skbuff.h:2753 skb_assert_len WARNING: at __dev_queue_xmit+0x21bc/0x4970 net/core/dev.c:4781  Call Trace:  \u003cTASK\u003e  dev_queue_xmit include/linux/netdevice.h:3448 [inline]  packet_xmit+0x243/0x310 net/packet/af_packet.c:276  tpacket_snd net/packet/af_packet.c:2907 [inline]  packet_sendmsg+0x28d6/0x4eb0 net/packet/af_packet.c:3134  When sending 0-byte packets via TPACKET ring buffer on devices with no hard header (e.g. dev-\u003ehard_header_len == 0), tpacket_fill_skb() populates an skb with skb-\u003elen == 0 and returns 0. tpacket_snd() then forwards this empty skb to packet_xmit(), causing __dev_queue_xmit() to hit skb_assert_len(skb).  Similar checks exist in packet_snd() via commit dc633700f00f (\"net/af_packet: check len when min_header_len equals to 0\") and in packet_sendmsg_spkt() via commit 6a341729fb31 (\"af_packet: Don't send zero-byte data in packet_sendmsg_spkt().\").  Return -EINVAL in tpacket_fill_skb() when skb-\u003elen is zero to reject zero-length packets in tpacket_snd().",
  "id": "DEBIAN-CVE-2026-80742",
  "modified": "2026-09-19T21:47:27.319732885Z",
  "published": "2026-09-03T13:06:13.437Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80742"
    }
  ],
  "upstream": [
    "CVE-2026-80742"
  ]
}