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CVE-2025-38273

net: tipc: fix refcount warning in tipc_aead_encrypt

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: net: tipc: fix refcount warning in tipc_aead_encrypt syzbot reported a refcount warning [1] caused by calling get_net() on a network namespace that is being destroyed (refcount=0). This happens when a TIPC discovery timer fires during network namespace cleanup. The recently added get_net() call in commit e279024617134 ("net/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done") attempts to hold a reference to the network namespace. However, if the namespace is already being destroyed, its refcount might be zero, leading to the use-after-free warning. Replace get_net() with maybe_get_net(), which safely checks if the refcount is non-zero before incrementing it. If the namespace is being destroyed, return -ENODEV early, after releasing the bearer reference. [1]: https://lore.kernel.org/all/68342b55.a70a0220.253bc2.0091.GAE@google.com/T/#m12019cf9ae77e1954f666914640efa36d52704a2

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5.10.238 · fixed in 5.10.239; From 5.15.185 · fixed in 5.15.186; From 6.1.141 · fixed in 6.1.142; From 6.6.93 · fixed in 6.6.94; From 6.12.31 · fixed in 6.12.34; From 6.14.9 · fixed in 6.15

  • Linux Linux

    6.15

References 7

git.kernel.org