CVE-2025-21638
Linux SCTP sysctl auth enables NULL Pointer Dereference
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: auth_enable: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.
INFO
Published Date :
Jan. 19, 2025, 11:15 a.m.
Last Modified :
Feb. 27, 2025, 9:59 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
Public PoC/Exploit Available at Github
CVE-2025-21638 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2025-21638.
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).
DSA and DLA for Debian last 14 days
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The following list is the news that have been mention
CVE-2025-21638 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-21638 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.
-
Initial Analysis by [email protected]
Feb. 27, 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 CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.10.41 from (excluding) 3.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.12.20 from (excluding) 3.13 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.14.5 from (excluding) 5.4.290 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 from (excluding) 5.10.234 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 from (excluding) 5.15.177 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 from (excluding) 6.1.125 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 from (excluding) 6.6.72 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 from (excluding) 6.12.10 Added Reference Type kernel.org: https://git.kernel.org/stable/c/10c869a52f266e40f548cc3c565d14930a5edafc Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 02, 2025
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/10c869a52f266e40f548cc3c565d14930a5edafc Added Reference https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jan. 23, 2025
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jan. 19, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: auth_enable: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure. Added Reference https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695 Added Reference https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3 Added Reference https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 Added Reference https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-21638 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-2025-21638
weaknesses.