CVE-2025-38273: Debian Linux

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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

Affected products

• Debian Debian Linux: version 11.0 only
• Linux Linux Kernel: from 6.12.31, before 6.12.34 (fixed in 6.12.34); from 6.14.9, before 6.15 (fixed in 6.15); from 6.15.1, before 6.15.3 (fixed in 6.15.3); version 5.10.238 only; version 5.15.185 only; version 6.1.141 only; …

Published 2025-07-10. Last modified 2026-07-30.