CVE-2024-38602: ax25: Fix reference count leak issues of ax25_dev
First published: Wed Jun 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ax25: Fix reference count leak issues of ax25_dev The ax25_addr_ax25dev() and ax25_dev_device_down() exist a reference count leak issue of the object "ax25_dev". Memory leak issue in ax25_addr_ax25dev(): The reference count of the object "ax25_dev" can be increased multiple times in ax25_addr_ax25dev(). This will cause a memory leak. Memory leak issues in ax25_dev_device_down(): The reference count of ax25_dev is set to 1 in ax25_dev_device_up() and then increase the reference count when ax25_dev is added to ax25_dev_list. As a result, the reference count of ax25_dev is 2. But when the device is shutting down. The ax25_dev_device_down() drops the reference count once or twice depending on if we goto unlock_put or not, which will cause memory leak. As for the issue of ax25_addr_ax25dev(), it is impossible for one pointer to be on a list twice. So add a break in ax25_addr_ax25dev(). As for the issue of ax25_dev_device_down(), increase the reference count of ax25_dev once in ax25_dev_device_up() and decrease the reference count of ax25_dev after it is removed from the ax25_dev_list.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.17<6.1.93 | |
| Linux Linux kernel | >=6.2<6.6.33 | |
| Linux Linux kernel | >=6.7<6.8.12 | |
| Linux Linux kernel | >=6.9<6.9.3 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/1ea02699c7557eeb35ccff2bd822de1b3e09d868
- https://git.kernel.org/stable/c/38eb01edfdaa1562fa00429be2e33f45383b1b3a
- https://git.kernel.org/stable/c/81d8240b0a243b3ddd8fa8aa172f1acc2f7cc8f3
- https://git.kernel.org/stable/c/ae467750a3765dd1092eb29f58247950a2f9b60c
- https://git.kernel.org/stable/c/b505e0319852b08a3a716b64620168eab21f4ced
- https://launchpad.net/bugs/cve/CVE-2024-38602
- https://git.kernel.org/linus/b505e0319852b08a3a716b64620168eab21f4ced
- https://security-tracker.debian.org/tracker/CVE-2024-38602
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38602
- https://nvd.nist.gov/vuln/detail/CVE-2024-38602
- https://ubuntu.com/security/CVE-2024-38602
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