{"id":"CVE-2026-98015","state":"PUBLISHED","title":"net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put","description":"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 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.","publishedAt":"2026-09-25T10:23:37.724Z","updatedAt":"2026-10-19T09:12:20.637Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"e3ee194a790896fa92fea20b5385a354be2f2c12","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"92f581cac93a71723456ac79ef54d9f60a251b42","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"a5833fdf53350b8b95a558fcf0056ddb1c0fe154","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"304ea40ef4561671503c36e47da44a0a31b71e36","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"e393789e92310d7c66f57c876101779c90816a12","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"18b2969073879b9cce24e1a78b118bdad54518d1","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"7ee07f601f8f507c9faf25c68a49396ab8950596","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"]}],"references":["https://git.kernel.org/stable/c/e3ee194a790896fa92fea20b5385a354be2f2c12","https://git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797","https://git.kernel.org/stable/c/92f581cac93a71723456ac79ef54d9f60a251b42","https://git.kernel.org/stable/c/a5833fdf53350b8b95a558fcf0056ddb1c0fe154","https://git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36","https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12","https://git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1","https://git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98015.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98015","state":"PUBLISHED","datePublished":"2026-09-25T10:23:37.724Z","dateUpdated":"2026-10-19T09:12:20.637Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:19:56.069Z"},"containers":{"cna":{"title":"net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"e3ee194a790896fa92fea20b5385a354be2f2c12","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"92f581cac93a71723456ac79ef54d9f60a251b42","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"a5833fdf53350b8b95a558fcf0056ddb1c0fe154","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"304ea40ef4561671503c36e47da44a0a31b71e36","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"e393789e92310d7c66f57c876101779c90816a12","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"18b2969073879b9cce24e1a78b118bdad54518d1","versionType":"git"},{"version":"10caabdaad5ace85577a453da97d1f8d3b944427","status":"affected","lessThan":"7ee07f601f8f507c9faf25c68a49396ab8950596","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.3","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e3ee194a790896fa92fea20b5385a354be2f2c12"},{"url":"https://git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797"},{"url":"https://git.kernel.org/stable/c/92f581cac93a71723456ac79ef54d9f60a251b42"},{"url":"https://git.kernel.org/stable/c/a5833fdf53350b8b95a558fcf0056ddb1c0fe154"},{"url":"https://git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36"},{"url":"https://git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12"},{"url":"https://git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1"},{"url":"https://git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:12:20.637Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}