CVE-2025-21637

Summary

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

sctp: sysctl: udp_port: 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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux046c052b475e7119b6a30e3483e2888fc606a2f8 < 0a0966312ac3eedd7f5f2a766ed4702df39a9a65affected
LinuxLinux046c052b475e7119b6a30e3483e2888fc606a2f8 < e919197fb8616331f5dc81e4c3cc3d12769cb725affected
LinuxLinux046c052b475e7119b6a30e3483e2888fc606a2f8 < 55627918febdf9d71107a1e68d1528dc591c9a15affected
LinuxLinux046c052b475e7119b6a30e3483e2888fc606a2f8 < 5b77d73f3be5102720fb685b9e6900e3500e1096affected
LinuxLinux046c052b475e7119b6a30e3483e2888fc606a2f8 < c10377bbc1972d858eaf0ab366a311b39f8ef1b6affected
LinuxLinux5.11affected
LinuxLinux0 < 5.11unaffected
LinuxLinux5.15.177 <= 5.15.*unaffected
LinuxLinux6.1.125 <= 6.1.*unaffected
LinuxLinux6.6.72 <= 6.6.*unaffected
LinuxLinux6.12.10 <= 6.12.*unaffected
LinuxLinux6.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References