CVE-2025-21636

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxd1e462a7a5f359cbb9a0e8fbfafcfb6657034105 < 1dc5da6c4178f3e4b95c631418f72de9f86c0449affected
LinuxLinuxd1e462a7a5f359cbb9a0e8fbfafcfb6657034105 < 44ee8635922b6eb940faddb961a8347c6857d722affected
LinuxLinuxd1e462a7a5f359cbb9a0e8fbfafcfb6657034105 < 284a221f8fa503628432c7bb5108277c688c6ffaaffected
LinuxLinuxd1e462a7a5f359cbb9a0e8fbfafcfb6657034105 < bcf8c60074e81ed2ac2d35130917175a3949c917affected
LinuxLinuxd1e462a7a5f359cbb9a0e8fbfafcfb6657034105 < 6259d2484d0ceff42245d1f09cc8cb6ee72d847aaffected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
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