{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2"
            },
            {
              "fixed": "753e5cdcca5474d230d62bb3489e5168ab27c272"
            },
            {
              "fixed": "c488071c3441fa34f5a87cd6c12ce2cc6304f20e"
            },
            {
              "fixed": "a38c0eb447e2dd0120a2ebcdba470f9505ac8907"
            },
            {
              "fixed": "de2b2004e16f2930eb689175e2c1998b0a68d499"
            },
            {
              "fixed": "7d043e24520a273c362be5dd7d9c82796879a49b"
            },
            {
              "fixed": "7cf561843ed0ad57501892a65abb77957e6c800f"
            },
            {
              "fixed": "179a5b2171573d94a25c9aa8e1c9f9ac352ad316"
            },
            {
              "fixed": "5fe7007aed9ad069b2bd77e5d0c875c64f5c0269"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.10.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90160.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlwt_bpf: Restore reserved headroom after xmit program\n\nip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT\nxmit. An LWT_XMIT BPF program can then modify the skb head and still\nreturn BPF_OK, so bpf_xmit() rechecks the remaining headroom before the\nskb continues to neighbour output.\n\nThat recheck uses dst-\u003edev-\u003ehard_header_len. This is not enough for the\nneighbour cached-header path: neigh_hh_output() copies the cached hardware\nheader using the aligned hh_cache size, HH_DATA_MOD for short headers or\nHH_DATA_ALIGN(hh_len) otherwise.\n\nOn Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If\nan LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can\nstill have 15 bytes of headroom after the program. The existing check\naccepts that, after which neigh_hh_output() hits its headroom warning and\ndrops the skb.\n\nUse LL_RESERVED_SPACE(dst-\u003edev) in the post-BPF headroom check to match\nthe reservation made before LWT xmit.",
  "id": "CVE-2026-90160",
  "modified": "2026-09-19T03:30:19.363499020Z",
  "published": "2026-09-17T16:06:51.806Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/179a5b2171573d94a25c9aa8e1c9f9ac352ad316"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5fe7007aed9ad069b2bd77e5d0c875c64f5c0269"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/753e5cdcca5474d230d62bb3489e5168ab27c272"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7cf561843ed0ad57501892a65abb77957e6c800f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d043e24520a273c362be5dd7d9c82796879a49b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a38c0eb447e2dd0120a2ebcdba470f9505ac8907"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c488071c3441fa34f5a87cd6c12ce2cc6304f20e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de2b2004e16f2930eb689175e2c1998b0a68d499"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90160.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90160"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "lwt_bpf: Restore reserved headroom after xmit program"
}