High 7.1Published Jan 19, 2025

CVE-2025-21638sctp: sysctl: auth_enable: avoid using current->nsproxy

Updated under an hour ago (Oct 27, 2026, 3:10 PM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b14878ccb7fac0242db82720b784ab62c467c0dc before cf387cdebfaebae228dfba162f94c567a67610c3; from b14878ccb7fac0242db82720b784ab62c467c0dc before dc583e7e5f8515ca489c0df28e4362a70eade382; from b14878ccb7fac0242db82720b784ab62c467c0dc before bd2a2939423566c654545fa3e96a656662a0af9e; from b14878ccb7fac0242db82720b784ab62c467c0dc before 1b67030d39f2b00f94ac1f0af11ba6657589e4d3; from b14878ccb7fac0242db82720b784ab62c467c0dc before 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6; from b14878ccb7fac0242db82720b784ab62c467c0dc before c184bc621e3cef03ac9ba81a50dda2dae6a21d36; from b14878ccb7fac0242db82720b784ab62c467c0dc before 15649fd5415eda664ef35780c2013adeb5d9c695; e5eae4a0511241959498b180fa0df0d4f1b11b9c; and 5 more ranges	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 3.10.41 before 3.11; from 3.12.20 before 3.13; from 3.14.5 before 5.4.290; from 5.5 before 5.10.234; from 5.11 before 5.15.177; from 5.16 before 6.1.125; from 6.2 before 6.6.72; from 6.7 before 6.12.10; and 6 more ranges	NVD

References

References

https://git.kernel.org/stable/c/cf387cdebfaebae228dfba162f94c567a67610c3
https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382	patch
https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e	patch
https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3	patch
https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6	patch
https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36	patch
https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695	patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
https://cert-portal.siemens.com/productcert/html/ssa-265688.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.