{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2021-47321",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-05-21T14:28:16.974Z",
        "datePublished": "2024-05-21T14:35:35.877Z",
        "dateUpdated": "2026-05-11T13:52:14.220Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T13:52:14.220Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: Fix possible use-after-free by calling del_timer_sync()\n\nThis driver's remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver's remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/watchdog/lpc18xx_wdt.c",
                        "drivers/watchdog/w83877f_wdt.c"
                    ],
                    "versions": [
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "58606882ad8ec6c39e0f40344b922921ef94ab4d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "ca96b8ea5e74956071154bdb456778cc3027e79f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "8bec568d7518b1504a602ed5376bb322e4dbb270",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "ecd620e0fb1ff7f78fdb593379b2e6938c99707a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "db222f1477ad5692cd454709b714949807e5d111",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "4c05dac488a660fe2925c047ecb119e7afaaeb1e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "1a053c4d716898a53c2e31c574a70ea0c37044a3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                            "lessThan": "d0212f095ab56672f6f36aabc605bda205e1e0bf",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/watchdog/lpc18xx_wdt.c",
                        "drivers/watchdog/w83877f_wdt.c"
                    ],
                    "versions": [
                        {
                            "version": "4.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.4.276",
                            "lessThanOrEqual": "4.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.9.276",
                            "lessThanOrEqual": "4.9.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.14.240",
                            "lessThanOrEqual": "4.14.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.19.198",
                            "lessThanOrEqual": "4.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.134",
                            "lessThanOrEqual": "5.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.52",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.12.19",
                            "lessThanOrEqual": "5.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.13.4",
                            "lessThanOrEqual": "5.13.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.14",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "4.4.276"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "4.9.276"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "4.14.240"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "4.19.198"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "5.4.134"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "5.10.52"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "5.12.19"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "5.13.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "5.14"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111"
                },
                {
                    "url": "https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf"
                }
            ],
            "title": "watchdog: Fix possible use-after-free by calling del_timer_sync()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        },
        "adp": [
            {
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2024-08-04T05:32:08.446Z"
                },
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3",
                        "tags": [
                            "x_transferred"
                        ]
                    },
                    {
                        "url": "https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf",
                        "tags": [
                            "x_transferred"
                        ]
                    }
                ]
            },
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2021-47321",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "version": "2.0.3",
                                "timestamp": "2024-09-10T15:39:06.038849Z"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2024-09-11T17:32:59.148Z"
                }
            }
        ]
    }
}