CVE-2026-43080 l2tp: Drop large packets with UDP encap

🗓️ 06 May 2026 07:40:16Reported by LinuxType

Fix overflow in l2tp UDP length handling by dropping oversized PPPoL2TP packets.

Reporter	Title	Published	Views	Family All 19
ATTACKERKB	CVE-2026-43080	6 May 202607:40	–	attackerkb
CNNVD	Linux kernel 安全漏洞	6 May 202600:00	–	cnnvd
CVE	CVE-2026-43080	6 May 202607:40	–	cve
Debian CVE	CVE-2026-43080	6 May 202607:40	–	debiancve
EUVD	EUVD-2026-27571	6 May 202612:30	–	euvd
NVD	CVE-2026-43080	6 May 202610:16	–	nvd
OSV	BELL-CVE-2026-43080	7 May 202606:08	–	osv
OSV	DEBIAN-CVE-2026-43080	6 May 202610:16	–	osv
OSV	ROOT-OS-DEBIAN-11-CVE-2026-43080 CVE-2026-43080 in rootio-linux - Patched by Root	12 Jun 202604:02	–	osv
OSV	ROOT-OS-DEBIAN-12-CVE-2026-43080 CVE-2026-43080 in rootio-linux - Patched by Root	12 Jun 202604:20	–	osv

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/l2tp/l2tp_core.c"
    ],
    "versions": [
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "02d787fd0922c71c0264449fe82d35983613e4e5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "c2994fd24997ed63d713c03313f863645adb4d6c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "a42452db035577e150ffd9adf98c56fef9fb9408",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "9ccce02d501335f59a02f26c878c5e095b16302f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "77c1489398c85a844f90205f5e76fd6bc8bb4089",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "86534c97abd6365a9a021fd767a2023e63c44469",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "f295fe86e22ff0a2ecebf05e30a387e5cf6f6ddc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3557baabf28088f49bdf72a048fd33ab62e205b1",
        "lessThan": "ebe560ea5f54134279356703e73b7f867c89db13",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/l2tp/l2tp_core.c"
    ],
    "versions": [
      {
        "version": "2.6.23",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.23",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.258",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.209",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.175",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.136",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.83",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.24",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.14",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

Source	Link
git	www.git.kernel.org/stable/c/77c1489398c85a844f90205f5e76fd6bc8bb4089
git	www.git.kernel.org/stable/c/ebe560ea5f54134279356703e73b7f867c89db13
git	www.git.kernel.org/stable/c/9ccce02d501335f59a02f26c878c5e095b16302f
git	www.git.kernel.org/stable/c/c2994fd24997ed63d713c03313f863645adb4d6c
git	www.git.kernel.org/stable/c/f295fe86e22ff0a2ecebf05e30a387e5cf6f6ddc
git	www.git.kernel.org/stable/c/02d787fd0922c71c0264449fe82d35983613e4e5
git	www.git.kernel.org/stable/c/86534c97abd6365a9a021fd767a2023e63c44469
git	www.git.kernel.org/stable/c/a42452db035577e150ffd9adf98c56fef9fb9408

01 Jun 2026 16:14Current

EPSS0.00018