{"id":"CVE-2026-98015","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put\n\nIn mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads\ntt->ref_count after termtbl_mutex ha…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put\n\nIn mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads\ntt->ref_count after termtbl_mutex ha…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < 304ea40ef4561671503c36e47da44a0a31b71e36","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < e393789e92310d7c66f57c876101779c90816a12","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < 18b2969073879b9cce24e1a78b118bdad54518d1","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < 7ee07f601f8f507c9faf25c68a49396ab8950596","Linux 5.3"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:29.927","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98015","references":[{"url":"https://git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.858Z","slug":"CVE-2026-98015","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put\n\nIn mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads\ntt->ref_count after termtbl_mutex has been released.  Two concurrent\ncallers on the same mlx5_termtbl_handle race: one decrements ref_count\nto zero, removes the hash entry, and calls kfree(tt) while the other\nhas already dropped the mutex and is about to evaluate\nif (!tt->ref_count), producing a use-after-free.\n\nFix this by capturing the result of the decrement into a stack-local\nlast variable before dropping the mutex.  The cleanup decision is now\nmade entirely under termtbl_mutex, and tt is not touched after\nkfree.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}