CVE-2025-38273

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd42ed4de6aba232d946d20653a70f79158a6535b < 445d59025d76d0638b03110f8791d5b89ed5162daffected
LinuxLinuxf5c2c4eaaa5a8e7e0685ec031d480e588e263e59 < e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029affected
LinuxLinuxb8fcae6d2e93c54cacb8f579a77d827c1c643eb5 < 307391e8fe70401a6d39ecc9978e13c2c0cdf81faffected
LinuxLinuxb19fc1d0be3c3397e5968fe2627f22e7f84673b1 < acab7ca5ff19889b80a8ee7dec220ee1a96dede9affected
LinuxLinux689a205cd968a1572ab561b0c4c2d50a10e9d3b0 < c762fc79d710d676b793f9d98b1414efe6eb51e6affected
LinuxLinuxe279024617134c94fd3e37470156534d5f2b3472 < 9ff60e0d9974dccf24e89bcd3ee7933e538d929faffected
LinuxLinuxe279024617134c94fd3e37470156534d5f2b3472 < f29ccaa07cf3d35990f4d25028cc55470d29372baffected
LinuxLinux4a0fddc2c0d5c28aec8c262ad4603be0bef1938caffected
LinuxLinux5.10.238 < 5.10.239affected
LinuxLinux5.15.185 < 5.15.186affected
LinuxLinux6.1.141 < 6.1.142affected
LinuxLinux6.6.93 < 6.6.94affected
LinuxLinux6.12.31 < 6.12.34affected
LinuxLinux6.14.9 < 6.15affected
LinuxLinux6.15affected
LinuxLinux0 < 6.15unaffected
LinuxLinux5.10.239 <= 5.10.*unaffected
LinuxLinux5.15.186 <= 5.15.*unaffected
LinuxLinux6.1.142 <= 6.1.*unaffected
LinuxLinux6.6.94 <= 6.6.*unaffected
LinuxLinux6.12.34 <= 6.12.*unaffected
LinuxLinux6.15.3 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References