CVE-2025-38273

net: tipc: fix refcount warning in tipc_aead_encrypt

State: Published
Severity: 7.8 High
Published: Jul 10, 2025
Updated: Aug 5, 2026
Reserved: Apr 16, 2025

Description

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

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d42ed4de6aba232d946d20653a70f79158a6535b to before 445d59025d76d0638b03110f8791d5b89ed5162dAffected f5c2c4eaaa5a8e7e0685ec031d480e588e263e59 to before e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029Affected b8fcae6d2e93c54cacb8f579a77d827c1c643eb5 to before 307391e8fe70401a6d39ecc9978e13c2c0cdf81fAffected b19fc1d0be3c3397e5968fe2627f22e7f84673b1 to before acab7ca5ff19889b80a8ee7dec220ee1a96dede9Affected 689a205cd968a1572ab561b0c4c2d50a10e9d3b0 to before c762fc79d710d676b793f9d98b1414efe6eb51e6Affected e279024617134c94fd3e37470156534d5f2b3472 to before 9ff60e0d9974dccf24e89bcd3ee7933e538d929fAffected e279024617134c94fd3e37470156534d5f2b3472 to before f29ccaa07cf3d35990f4d25028cc55470d29372bAffected 4a0fddc2c0d5c28aec8c262ad4603be0bef1938cAffected 5.10.238 to before 5.10.239Affected 5.15.185 to before 5.15.186Affected 6.1.141 to before 6.1.142Affected 6.6.93 to before 6.6.94Affected 6.12.31 to before 6.12.34Affected 6.14.9 to before 6.15Affected
LinuxLinux	6.15Affected before 6.15Not affected 5.10.239 through 5.10.Not affected 5.15.186 through 5.15.Not affected 6.1.142 through 6.1.Not affected 6.6.94 through 6.6.Not affected 6.12.34 through 6.12.Not affected 6.15.3 through 6.15.Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

d42ed4de6aba232d946d20653a70f79158a6535b to before 445d59025d76d0638b03110f8791d5b89ed5162dAffected
f5c2c4eaaa5a8e7e0685ec031d480e588e263e59 to before e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029Affected
b8fcae6d2e93c54cacb8f579a77d827c1c643eb5 to before 307391e8fe70401a6d39ecc9978e13c2c0cdf81fAffected
b19fc1d0be3c3397e5968fe2627f22e7f84673b1 to before acab7ca5ff19889b80a8ee7dec220ee1a96dede9Affected
689a205cd968a1572ab561b0c4c2d50a10e9d3b0 to before c762fc79d710d676b793f9d98b1414efe6eb51e6Affected
e279024617134c94fd3e37470156534d5f2b3472 to before 9ff60e0d9974dccf24e89bcd3ee7933e538d929fAffected
e279024617134c94fd3e37470156534d5f2b3472 to before f29ccaa07cf3d35990f4d25028cc55470d29372bAffected
4a0fddc2c0d5c28aec8c262ad4603be0bef1938cAffected
5.10.238 to before 5.10.239Affected
5.15.185 to before 5.15.186Affected
6.1.141 to before 6.1.142Affected
6.6.93 to before 6.6.94Affected
6.12.31 to before 6.12.34Affected
6.14.9 to before 6.15Affected

LinuxLinux

6.15Affected
before 6.15Not affected
5.10.239 through 5.10.*Not affected
5.15.186 through 5.15.*Not affected
6.1.142 through 6.1.*Not affected
6.6.94 through 6.6.*Not affected
6.12.34 through 6.12.*Not affected
6.15.3 through 6.15.*Not affected
6.16 and laterNot affected

References

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