{"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":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-825","CWE-416"],"vendor":"Linux","product":"Linux","affected":["Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < e3ee194a790896fa92fea20b5385a354be2f2c12","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < 92f581cac93a71723456ac79ef54d9f60a251b42","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < a5833fdf53350b8b95a558fcf0056ddb1c0fe154","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < 304ea40ef4561671503c36e47da44a0a31b71e36","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < e393789e92310d7c66f57c876101779c90816a12","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < 18b2969073879b9cce24e1a78b118bdad54518d1","Linux >= 10caabdaad5ace85577a453da97d1f8d3b944427 < 7ee07f601f8f507c9faf25c68a49396ab8950596","Linux 5.3"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:24.657","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/92f581cac93a71723456ac79ef54d9f60a251b42","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a5833fdf53350b8b95a558fcf0056ddb1c0fe154","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e3ee194a790896fa92fea20b5385a354be2f2c12","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98015.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98015"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541026"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98015"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98015"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98015.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-98015"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00177,"epssPercentile":0.07176,"cvssSource":"vendor","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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98015.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212488,"id":"CVE-2026-98015","ts":1790668190036,"field":"cvss","old":null,"new":"7"},{"seq":212487,"id":"CVE-2026-98015","ts":1790668190036,"field":"severity","old":"none","new":"high"}]}