CVE-2026-98015

Summary

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put

In mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads tt->ref_count after termtbl_mutex has been released. Two concurrent callers on the same mlx5_termtbl_handle race: one decrements ref_count to zero, removes the hash entry, and calls kfree(tt) while the other has already dropped the mutex and is about to evaluate if (!tt->ref_count), producing a use-after-free.

Fix this by capturing the result of the decrement into a stack-local last variable before dropping the mutex. The cleanup decision is now made entirely under termtbl_mutex, and tt is not touched after kfree.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux10caabdaad5ace85577a453da97d1f8d3b944427 < 304ea40ef4561671503c36e47da44a0a31b71e36affected
LinuxLinux10caabdaad5ace85577a453da97d1f8d3b944427 < e393789e92310d7c66f57c876101779c90816a12affected
LinuxLinux10caabdaad5ace85577a453da97d1f8d3b944427 < 18b2969073879b9cce24e1a78b118bdad54518d1affected
LinuxLinux10caabdaad5ace85577a453da97d1f8d3b944427 < 7ee07f601f8f507c9faf25c68a49396ab8950596affected
LinuxLinux5.3affected
LinuxLinux0 < 5.3unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References