Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 10caabdaad5ace85577a453da97d1f8d3b944427 before e3ee194a790896fa92fea20b5385a354be2f2c12; affected 10caabdaad5ace85577a453da97d1f8d3b944427 before b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797; affected 10caabdaad5ace85577a453da97d1f8d3b944427 before 92f581cac93a71723456ac79ef54d9f60a251b42; affected 10caabdaad5ace85577a453da97d1f8d3b944427 before a5833fdf53350b8b95a558fcf0056ddb1c0fe154; affected 10caabdaad5ace85577a453da97d1f8d3b944427 before 304ea40ef4561671503c36e47da44a0a31b71e36; affected 10caabdaad5ace85577a453da97d1f8d3b944427 before e393789e92310d7c66f57c876101779c90816a12; affected 10caabdaad5ace85577a453da97d1f8d3b944427 before 18b2969073879b9cce24e1a78b118bdad54518d1; affected 10caabdaad5ace85577a453da97d1f8d3b944427 before 7ee07f601f8f507c9faf25c68a49396ab8950596 |
| Linux / Linux | affected 5.3; unaffected 0 before 5.3; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/e3ee194a790896fa92fea20b5385a354be2f2c12
- https://git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797
- https://git.kernel.org/stable/c/92f581cac93a71723456ac79ef54d9f60a251b42
- https://git.kernel.org/stable/c/a5833fdf53350b8b95a558fcf0056ddb1c0fe154
- https://git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36
- https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12
- https://git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1
- https://git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596