CVE Watch30 jul 2026

CVE-2025-21638

In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: auth_enable: avoid using current->nsproxy As mentioned i

CVSS

7.1

Alto

EPSS

0.2%

p14

KEV

—

Exploit Today

0-100

Publicado: 19 ene 2025 · Última mod.: 30 jul 2026 · CWE-476

EPSS · 30d

0.2%EPSS · 30 días0.2%

2026-07-292026-08-26

Descripción técnica

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.

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