atm: fore200e: fix use-after-free in tasklets during device removal_CVE-2026-43203

{
    "lastseen": "",
    "description": "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-> // 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.",
    "published": "2026-05-06T11:28:08.949Z",
    "modified": "2026-05-08T12:41:12.811Z",
    "type": "cve",
    "title": "atm: fore200e: fix use-after-free in tasklets during device removal",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2\nhttps://git.kernel.org/stable/c/73fbc5d1a9ccb626937500bbd67136f077d8237b\nhttps://git.kernel.org/stable/c/aba0b4bc09376dfc3d53c826514fe38fc8337f52\nhttps://git.kernel.org/stable/c/e075ec9b08f862dade8011481058f7eb5f716c57\nhttps://git.kernel.org/stable/c/97900f512252a59f23d6ce4ab215cc88fed66e68\nhttps://git.kernel.org/stable/c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d\nhttps://git.kernel.org/stable/c/5189368f10903956be05062d160b2804bf5e5016\nhttps://git.kernel.org/stable/c/8930878101cd40063888a68af73b1b0f8b6c79bc",
    "id": "CVE-2026-43203",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\nLinux Linux 2.6.12",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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            "privilegesRequired": "",
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            "scope": "",
            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
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    "ai_version": "",
    "ai_score": 0
}