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CVE-2025-21638

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.11, 3.13, 3.15, 5.4.292, 5.10.234, and 4 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From b14878ccb7fac0242db82720b784ab62c467c0dc · fixed in cf387cdebfaebae228dfba162f94c567a67610c3; From b14878ccb7fac0242db82720b784ab62c467c0dc · fixed in dc583e7e5f8515ca489c0df28e4362a70eade382; From b14878ccb7fac0242db82720b784ab62c467c0dc · fixed in bd2a2939423566c654545fa3e96a656662a0af9e; From b14878ccb7fac0242db82720b784ab62c467c0dc · fixed in 1b67030d39f2b00f94ac1f0af11ba6657589e4d3; From b14878ccb7fac0242db82720b784ab62c467c0dc · fixed in 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6; From b14878ccb7fac0242db82720b784ab62c467c0dc · fixed in c184bc621e3cef03ac9ba81a50dda2dae6a21d36; From b14878ccb7fac0242db82720b784ab62c467c0dc · fixed in 15649fd5415eda664ef35780c2013adeb5d9c695; From 3.10.41 · fixed in 3.11; From 3.12.21 · fixed in 3.13; From 3.14.5 · fixed in 3.15

  • Linux Linux

    3.15

  • KernelLinux

    From 3.15.0 · fixed in 5.4.292; From 5.5.0 · fixed in 5.10.234; From 5.11.0 · fixed in 5.15.177; From 5.16.0 · fixed in 6.1.125; From 6.2.0 · fixed in 6.6.72; From 6.7.0 · fixed in 6.12.10

References 7

git.kernel.org