CVE-2021-47248
Linux Kernel UDP Socket Unlocking Weakness
Description
In the Linux kernel, the following vulnerability has been resolved: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup(). The root cause is udp_abort() racing with close(). Both racing functions acquire the socket lock, but udp{v6}_destroy_sock() release it before performing destructive actions. We can't easily extend the socket lock scope to avoid the race, instead use the SOCK_DEAD flag to prevent udp_abort from doing any action when the critical race happens. Diagnosed-and-tested-by: Kaustubh Pandey <[email protected]>
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 30, 2025, 3:21 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.0
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47248.
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-2021-47248 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47248 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.
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Initial Analysis by [email protected]
Apr. 30, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-362 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.9 up to (excluding) 4.9.274 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.238 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.196 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.128 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.46 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.13 Added Reference Type CVE: https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1ad Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1ad Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f 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/2f73448041bd0682d4b552cfd314ace66107f1ad Added Reference https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56 Added Reference https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241 Added Reference https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac Added Reference https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e Added Reference https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e Added Reference https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f -
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. 21, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup(). The root cause is udp_abort() racing with close(). Both racing functions acquire the socket lock, but udp{v6}_destroy_sock() release it before performing destructive actions. We can't easily extend the socket lock scope to avoid the race, instead use the SOCK_DEAD flag to prevent udp_abort from doing any action when the critical race happens. Diagnosed-and-tested-by: Kaustubh Pandey <[email protected]> Added Reference kernel.org https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1ad [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47248 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47248
weaknesses.