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Unrated severityNVD Advisory· Published Jan 19, 2025· Updated Nov 3, 2025

sctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy

CVE-2025-21636

Description

In the Linux kernel, the following vulnerability has been resolved:

sctp: sysctl: plpmtud_probe_interval: 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.probe_interval' is used.

Affected products

65

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

5

News mentions

0

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