What’s Vulnerable › Vulnerabilities
CVE-2024-38554: ax25: Fix reference count leak issue of net_device
- Severity: medium (CVSS 5.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-06-19 · updated 2026-06-17
Description
In the Linux kernel, the following vulnerability has been resolved: ax25: Fix reference count leak issue of net_device There is a reference count leak issue of the object "net_device" in ax25_dev_device_down(). When the ax25 device is shutting down, the ax25_dev_device_down() drops the reference count of net_device one or zero times depending on if we goto unlock_put or not, which will cause memory leak. In order to solve the above issue, decrease the reference count of net_device after dev->ax25_ptr is set to null.
Affected products
- Linux kernel: from 5.17 before 6.1.93; from 6.2 before 6.6.33; from 6.7 before 6.8.12; from 6.9 before 6.9.3 — fixed in 6.1.93, 6.6.33, 6.8.12, 6.9.3
How to fix
Upgrade to a fixed version: Linux kernel 6.1.93, 6.6.33, 6.8.12, 6.9.3. Check the vendor advisory for mitigations.
References
- https://git.kernel.org/stable/c/36e56b1b002bb26440403053f19f9e1a8bc075b2
- https://git.kernel.org/stable/c/3ec437f9bbae68e9b38115c4c91de995f73f6bad
- https://git.kernel.org/stable/c/8bad3a20a27be8d935f2aae08d3c6e743754944a
- https://git.kernel.org/stable/c/965d940fb7414b310a22666503d2af69459c981b
- https://git.kernel.org/stable/c/eef95df9b752699bddecefa851f64858247246e9
- https://git.kernel.org/stable/c/36e56b1b002bb26440403053f19f9e1a8bc075b2
- https://git.kernel.org/stable/c/3ec437f9bbae68e9b38115c4c91de995f73f6bad
- https://git.kernel.org/stable/c/8bad3a20a27be8d935f2aae08d3c6e743754944a
- https://git.kernel.org/stable/c/965d940fb7414b310a22666503d2af69459c981b
- https://git.kernel.org/stable/c/eef95df9b752699bddecefa851f64858247246e9
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