Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB can_put_echo_skb() takes ownership of the SKB and it may be freed during or after the call. However, xilinx_can xcan_write_frame() keeps using SKB after the call. Fix that by only calling can_put_echo_skb() after the code is done touching the SKB. The tx_lock is held for the entire xcan_write_frame() execution and also on the can_get_echo_skb() side so the order of operations does not matter. An earlier fix commit 3d3c817c3a40 ("can: xilinx_can: Fix usage of skb memory") did not move the can_put_echo_skb() call far enough. [mkl: add "commit" in front of sha1 in patch description] [mkl: fix indention]
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.19, < 5.15.194 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1139321161a3ba5e45e61e0738b37f42f20bc57aPatch
- https://git.kernel.org/stable/c/668cc1e3bb21101d074e430de1b7ba8fd10189e7Patch
- https://git.kernel.org/stable/c/725b33deebd6e4c96fe7893f384510a54258f28fPatch
- https://git.kernel.org/stable/c/94b050726288a56a6b8ff55aa641f2fedbd3b44cPatch
- https://git.kernel.org/stable/c/e202ffd9e54538ef67ec301ebd6d9da4823466c9Patch
- https://git.kernel.org/stable/c/ef79f00be72bd81d2e1e6f060d83cf7e425deee4Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2025-39873?
CVE-2025-39873 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB can_put_echo_skb() takes ownership of the SKB and it ma...
How severe is CVE-2025-39873?
CVE-2025-39873 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-39873?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.