{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "91f25749aaf57c47ae1e12478144e6ea8c8562f2"
            },
            {
              "fixed": "73fbc5d1a9ccb626937500bbd67136f077d8237b"
            },
            {
              "fixed": "aba0b4bc09376dfc3d53c826514fe38fc8337f52"
            },
            {
              "fixed": "e075ec9b08f862dade8011481058f7eb5f716c57"
            },
            {
              "fixed": "97900f512252a59f23d6ce4ab215cc88fed66e68"
            },
            {
              "fixed": "e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d"
            },
            {
              "fixed": "5189368f10903956be05062d160b2804bf5e5016"
            },
            {
              "fixed": "8930878101cd40063888a68af73b1b0f8b6c79bc"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.252"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.202"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.16"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43203.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: fore200e: fix use-after-free in tasklets during device removal\n\nWhen the PCA-200E or SBA-200E adapter is being detached, the fore200e\nis deallocated. However, the tx_tasklet or rx_tasklet may still be running\nor pending, leading to use-after-free bug when the already freed fore200e\nis accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet().\n\nOne of the race conditions can occur as follows:\n\nCPU 0 (cleanup)           | CPU 1 (tasklet)\nfore200e_pca_remove_one() | fore200e_interrupt()\n  fore200e_shutdown()     |   tasklet_schedule()\n    kfree(fore200e)       | fore200e_tx_tasklet()\n                          |   fore200e-\u003e // UAF\n\nFix this by ensuring tx_tasklet or rx_tasklet is properly canceled before\nthe fore200e is released. Add tasklet_kill() in fore200e_shutdown() to\nsynchronize with any pending or running tasklets. Moreover, since\nfore200e_reset() could prevent further interrupts or data transfers,\nthe tasklet_kill() should be placed after fore200e_reset() to prevent\nthe tasklet from being rescheduled in fore200e_interrupt(). Finally,\nit only needs to do tasklet_kill() when the fore200e state is greater\nthan or equal to FORE200E_STATE_IRQ, since tasklets are uninitialized\nin earlier states. In a word, the tasklet_kill() should be placed in\nthe FORE200E_STATE_IRQ branch within the switch...case structure.\n\nThis bug was identified through static analysis.",
  "id": "CVE-2026-43203",
  "modified": "2026-07-08T05:37:35.960423915Z",
  "published": "2026-05-06T11:28:08.949Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5189368f10903956be05062d160b2804bf5e5016"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73fbc5d1a9ccb626937500bbd67136f077d8237b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8930878101cd40063888a68af73b1b0f8b6c79bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97900f512252a59f23d6ce4ab215cc88fed66e68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aba0b4bc09376dfc3d53c826514fe38fc8337f52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e075ec9b08f862dade8011481058f7eb5f716c57"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43203.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43203"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "atm: fore200e: fix use-after-free in tasklets during device removal"
}