CVE-2026-98015
Description
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.
How to fix
- Linux Linuxe3ee194a790896fa92fea20b5385a354be2f2c12, b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797, 92f581cac93a71723456ac79ef54d9f60a251b42, a5833fdf53350b8b95a558fcf0056ddb1c0fe154, 304ea40ef4561671503c36e47da44a0a31b71e36, e393789e92310d7c66f57c876101779c90816a12, 18b2969073879b9cce24e1a78b118bdad54518d1, 7ee07f601f8f507c9faf25c68a49396ab8950596 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < e3ee194a790896fa92fea20b5385a354be2f2c12, 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797, 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < 92f581cac93a71723456ac79ef54d9f60a251b42, 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < a5833fdf53350b8b95a558fcf0056ddb1c0fe154, 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < 304ea40ef4561671503c36e47da44a0a31b71e36, 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < e393789e92310d7c66f57c876101779c90816a12, 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < 18b2969073879b9cce24e1a78b118bdad54518d1, 10caabdaad5ace85577a453da97d1f8d3b944427 ≤ v < 7ee07f601f8f507c9faf25c68a49396ab8950596, 5.3 | e3ee194a790896fa92fea20b5385a354be2f2c12, b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797, 92f581cac93a71723456ac79ef54d9f60a251b42, a5833fdf53350b8b95a558fcf0056ddb1c0fe154, 304ea40ef4561671503c36e47da44a0a31b71e36, e393789e92310d7c66f57c876101779c90816a12, 18b2969073879b9cce24e1a78b118bdad54518d1, 7ee07f601f8f507c9faf25c68a49396ab8950596 |
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