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CVE-2026-98015

UnknownEPSS 0.18%

Last modified

CVE-2026-98015 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.18%

6.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 10caabdaad5ace85577a453da97d1f8d3b944427, < e3ee194a790896fa92fea20b5385a354be2f2c12; >= 10caabdaad5ace85577a453da97d1f8d3b944427, < b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797; >= 10caabdaad5ace85577a453da97d1f8d3b944427, < 92f581cac93a71723456ac79ef54d9f60a251b42; >= 10caabdaad5ace85577a453da97d1f8d3b944427, < a5833fdf53350b8b95a558fcf0056ddb1c0fe154; >= 10caabdaad5ace85577a453da97d1f8d3b944427, < 304ea40ef4561671503c36e47da44a0a31b71e36; >= 10caabdaad5ace85577a453da97d1f8d3b944427, < e393789e92310d7c66f57c876101779c90816a12; >= 10caabdaad5ace85577a453da97d1f8d3b944427, < 18b2969073879b9cce24e1a78b118bdad54518d1; >= 10caabdaad5ace85577a453da97d1f8d3b944427, < 7ee07f601f8f507c9faf25c68a49396ab8950596
LinuxLinux5.3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98015?
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 severe is CVE-2026-98015?
Severity scoring for CVE-2026-98015 is pending analysis. The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98015?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST