CVE-2021-47323 - OpenCVE

In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4
https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04
https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e
https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c
https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4
https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566
https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d
https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373
https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a
https://lore.kernel.org/linux-cve-announce/2024052132-CVE-2021-47323-deae@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47323
https://www.cve.org/CVERecord?id=CVE-2021-47323

History

No history.

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-21T14:35:37.181Z

Updated: 2024-11-04T12:03:41.629Z

Reserved: 2024-05-21T14:28:16.974Z

Link: CVE-2021-47323

Vulnrichment

Updated: 2024-08-04T05:32:08.471Z

NVD

Status : Awaiting Analysis

Published: 2024-05-21T15:15:19.467

Modified: 2024-07-03T01:37:38.240

Link: CVE-2021-47323

Redhat

Severity : Moderate

Publid Date: 2024-05-21T00:00:00Z

Links: CVE-2021-47323 - Bugzilla

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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."}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:05:58.883Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47323", "state": "PUBLISHED", "dateUpdated": "2024-08-04T05:32:08.471Z", "dateReserved": "2024-05-21T14:28:16.974Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T14:35:37.181Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()\n\nThis module'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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: watchdog: sc520_wdt: corrige posible use after free en wdt_turnoff(). La ruta de eliminaci\u00f3n de este m\u00f3dulo llama a del_timer(). Sin embargo, esa funci\u00f3n no espera hasta que finalice el controlador del temporizador. Esto significa que es posible que el controlador del temporizador a\u00fan est\u00e9 ejecut\u00e1ndose despu\u00e9s de que haya finalizado la funci\u00f3n de eliminaci\u00f3n del controlador, lo que dar\u00eda como resultado un use after free. Para solucionarlo, llame a del_timer_sync(), lo que garantiza que el controlador del temporizador haya finalizado y no pueda reprogramarse."}], "id": "CVE-2021-47323", "lastModified": "2024-07-03T01:37:38.240", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-05-21T15:15:19.467", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()", "id": "2282438", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282438"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwatchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()\nThis module'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.\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself.", "A vulnerability was found in the wdt_turnoff() function in the Linux kernel's watchdog module. This issue arises when the module's remove process calls del_timer(), which does not wait for the timer handler to finish. Consequently, the handler may still be running after the driver is removed, leading to a potential use-after-free issue."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47323", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47323\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47323\nhttps://lore.kernel.org/linux-cve-announce/2024052132-CVE-2021-47323-deae@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because this issue can cause system instability and crashes, as the use-after-free situation may disrupt normal operations.", "threat_severity": "Moderate", "upstream_fix": "kernel 4.4.276, kernel 4.9.276, kernel 4.14.240, kernel 4.19.198, kernel 5.4.134, kernel 5.10.52, kernel 5.12.19, kernel 5.13.4, kernel 5.14"}