CVE - CVE-2025-21640

CVE-ID
CVE-2025-21640	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71 URL:https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71 MISC:https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5 URL:https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5 MISC:https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4 URL:https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4 MISC:https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b URL:https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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