CVE-2026-98015

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

State: Published
Severity: Not scored
Published: Sep 25, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	10caabdaad5ace85577a453da97d1f8d3b944427 to before e3ee194a790896fa92fea20b5385a354be2f2c12Affected 10caabdaad5ace85577a453da97d1f8d3b944427 to before b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797Affected 10caabdaad5ace85577a453da97d1f8d3b944427 to before 92f581cac93a71723456ac79ef54d9f60a251b42Affected 10caabdaad5ace85577a453da97d1f8d3b944427 to before a5833fdf53350b8b95a558fcf0056ddb1c0fe154Affected 10caabdaad5ace85577a453da97d1f8d3b944427 to before 304ea40ef4561671503c36e47da44a0a31b71e36Affected 10caabdaad5ace85577a453da97d1f8d3b944427 to before e393789e92310d7c66f57c876101779c90816a12Affected 10caabdaad5ace85577a453da97d1f8d3b944427 to before 18b2969073879b9cce24e1a78b118bdad54518d1Affected 10caabdaad5ace85577a453da97d1f8d3b944427 to before 7ee07f601f8f507c9faf25c68a49396ab8950596Affected
LinuxLinux	5.3Affected before 5.3Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2.7 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

10caabdaad5ace85577a453da97d1f8d3b944427 to before e3ee194a790896fa92fea20b5385a354be2f2c12Affected
10caabdaad5ace85577a453da97d1f8d3b944427 to before b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797Affected
10caabdaad5ace85577a453da97d1f8d3b944427 to before 92f581cac93a71723456ac79ef54d9f60a251b42Affected
10caabdaad5ace85577a453da97d1f8d3b944427 to before a5833fdf53350b8b95a558fcf0056ddb1c0fe154Affected
10caabdaad5ace85577a453da97d1f8d3b944427 to before 304ea40ef4561671503c36e47da44a0a31b71e36Affected
10caabdaad5ace85577a453da97d1f8d3b944427 to before e393789e92310d7c66f57c876101779c90816a12Affected
10caabdaad5ace85577a453da97d1f8d3b944427 to before 18b2969073879b9cce24e1a78b118bdad54518d1Affected
10caabdaad5ace85577a453da97d1f8d3b944427 to before 7ee07f601f8f507c9faf25c68a49396ab8950596Affected

LinuxLinux

5.3Affected
before 5.3Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2.7 through 7.2.*Not affected
7.3 and laterNot affected

References

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