{"id":"CVE-2026-98015","summary":"net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put","details":"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-\u003eref_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-\u003eref_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.","modified":"2026-09-26T03:48:31.222319257Z","published":"2026-09-25T10:23:37.724Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98015.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98015.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98015"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"10caabdaad5ace85577a453da97d1f8d3b944427"},{"fixed":"304ea40ef4561671503c36e47da44a0a31b71e36"},{"fixed":"e393789e92310d7c66f57c876101779c90816a12"},{"fixed":"18b2969073879b9cce24e1a78b118bdad54518d1"},{"fixed":"7ee07f601f8f507c9faf25c68a49396ab8950596"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98015.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98015.json"}}],"schema_version":"1.9.0"}