CVE-2025-21640
Apache Linux Kernel SCTP Null Pointer Dereference Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: cookie_hmac_alg: 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, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is used.
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-2025-21640 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-2025-21640.
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-2025-21640 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-21640 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]
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) 3.8 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/03ca51faba2b017bf6c90e139434c4117d0afcdc Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1031462a944ba0fa83c25ab1111465f8345b5589 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/86ddf8118123cb58a0fb8724cad6979c4069065b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b 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/03ca51faba2b017bf6c90e139434c4117d0afcdc Added Reference https://git.kernel.org/stable/c/1031462a944ba0fa83c25ab1111465f8345b5589 -
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/86ddf8118123cb58a0fb8724cad6979c4069065b -
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: cookie_hmac_alg: 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, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is used. Added Reference https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71 Added Reference https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5 Added Reference https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4 Added Reference https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-21640 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-2025-21640
weaknesses.