CVE-2025-39873

Summary

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]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1598efe57b3e768056e4ca56cb9cf33111e68d1c < e202ffd9e54538ef67ec301ebd6d9da4823466c9affected
LinuxLinux1598efe57b3e768056e4ca56cb9cf33111e68d1c < 1139321161a3ba5e45e61e0738b37f42f20bc57aaffected
LinuxLinux1598efe57b3e768056e4ca56cb9cf33111e68d1c < 94b050726288a56a6b8ff55aa641f2fedbd3b44caffected
LinuxLinux1598efe57b3e768056e4ca56cb9cf33111e68d1c < 725b33deebd6e4c96fe7893f384510a54258f28faffected
LinuxLinux1598efe57b3e768056e4ca56cb9cf33111e68d1c < 668cc1e3bb21101d074e430de1b7ba8fd10189e7affected
LinuxLinux1598efe57b3e768056e4ca56cb9cf33111e68d1c < ef79f00be72bd81d2e1e6f060d83cf7e425deee4affected
LinuxLinux4.19affected
LinuxLinux0 < 4.19unaffected
LinuxLinux5.15.194 <= 5.15.*unaffected
LinuxLinux6.1.153 <= 6.1.*unaffected
LinuxLinux6.6.107 <= 6.6.*unaffected
LinuxLinux6.12.48 <= 6.12.*unaffected
LinuxLinux6.16.8 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References