Withdrawn: this CVE is not a vulnerability
The assigning CNA withdrew CVE-2021-47504 on 11 August 2026, and it carries the Rejected state at CVE.org and NVD. It must not be treated as a live finding. Its pre-withdrawal severity, score and exploitability are withheld below; the record itself is kept because withdrawals are reversible and because the reject reason is the correction worth publishing.
WITHDRAWN
CVE-2021-47504
io_uring: ensure task_work gets run as part of cancelations
Overview
Description
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Details
INFO
Published Date :
May 24, 2024, 3:15 p.m.
Last Modified :
Aug. 11, 2026, 3:17 a.m.
Remotely Exploit :
—
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47504 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47504 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Rejected by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 11, 2026
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 11, 2026
Action Type Old Value New Value Changed Description In the Linux kernel, the following vulnerability has been resolved: io_uring: ensure task_work gets run as part of cancelations If we successfully cancel a work item but that work item needs to be processed through task_work, then we can be sleeping uninterruptibly in io_uring_cancel_generic() and never process it. Hence we don't make forward progress and we end up with an uninterruptible sleep warning. While in there, correct a comment that should be IFF, not IIF. Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority. Removed CVSS V3.1 NIST: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Removed CWE NIST: NVD-CWE-noinfo Removed CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.1 up to (excluding) 5.15.8 Removed Reference kernel.org: https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 Removed Reference kernel.org: https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 Removed Reference CVE: https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 Removed Reference CVE: https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 Removed Reference Type kernel.org: https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 Types: Patch Removed Reference Type kernel.org: https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 Types: Patch Removed Reference Type CVE: https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 Types: Patch Removed Reference Type CVE: https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 Types: Patch Removed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2b188cc1bb857a9d4701ae59aa7768b5124e262e', 'lessThan': '8e12976c0c19ebc14b60046b1348c516a74c25a2', 'versionType': 'git'}, {'status': 'affected', 'version': '2b188cc1bb857a9d4701ae59aa7768b5124e262e', 'lessThan': '78a780602075d8b00c98070fa26e389b3b3efa72', 'versionType': 'git'}], 'programFiles': ['fs/io_uring.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.8', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '5.16', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/io_uring.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2b188cc1bb857a9d4701ae59aa7768b5124e262e', 'lessThan': '8e12976c0c19ebc14b60046b1348c516a74c25a2', 'versionType': 'git'}, {'status': 'affected', 'version': '2b188cc1bb857a9d4701ae59aa7768b5124e262e', 'lessThan': '78a780602075d8b00c98070fa26e389b3b3efa72', 'versionType': 'git'}], 'programFiles': ['fs/io_uring.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.8', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '5.16', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/io_uring.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2021-47504', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2024-06-14T18:38:00.409763Z'} -
Initial Analysis by [email protected]
Sep. 29, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.1 up to (excluding) 5.15.8 Added Reference Type kernel.org: https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 Added Reference https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 24, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: io_uring: ensure task_work gets run as part of cancelations If we successfully cancel a work item but that work item needs to be processed through task_work, then we can be sleeping uninterruptibly in io_uring_cancel_generic() and never process it. Hence we don't make forward progress and we end up with an uninterruptible sleep warning. While in there, correct a comment that should be IFF, not IIF. Added Reference kernel.org https://git.kernel.org/stable/c/8e12976c0c19ebc14b60046b1348c516a74c25a2 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/78a780602075d8b00c98070fa26e389b3b3efa72 [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.