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CVE-2025-21639

sctp: sysctl: rto_min/max: avoid using current->nsproxy

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.290, 5.10.234, 5.15.177, 6.1.125, 6.6.72, and 1 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: rto_min/max: 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.rto_min/max' is used.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 · fixed in c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9; From 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 · fixed in 246428bfb9e7db15c5cd08e1d0eca41b65af2b06; From 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 · fixed in 0f78f09466744589e420935e646ae78212a38290; From 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 · fixed in 4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482; From 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 · fixed in dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f; From 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 · fixed in c87f1f6ade56c711f8736901e330685b453e420e; From 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 · fixed in 9fc17b76fc70763780aa78b38fcf4742384044a5

  • Linux Linux

    3.13

  • KernelLinux

    From 3.13.0 · fixed in 5.4.290; 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