{"schema":"threatline.record/2","record":{"id":"CVE-2026-98552","aliases":[],"summary":"perf/core: Fix a refcount leak in attach_perf_ctx_data()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix a refcount leak in attach_perf_ctx_data()\n\nThe attach_perf_ctx_data() can race on global and !global cases.  The\nglobal case is protected by global_ctx_data_rwsem and shares a single\nreference count using perf_ctx_data.global field.\n\nBut when it races with !global case, it may miss to set the global field\nand result in a reference count leak.\n\n CPU1                                  CPU2\n ----------------------------------------------------------------\n attach_task_ctx_data(.global=1)       attach_task_ctx_data(.global=0)\n   cd1 = alloc_perf_ctx_data();          cd2 = alloc_perf_ctx_data();\n                                         //    { .global = 0, .refcount = 1 };\n\n                                         try_cmpxchg(); // success,\n                                         // task->perf_ctx_data = cd2\n   try_cmpxhg(); // fail; old = cd2\n   refcount_inc_not_zero(&old->refcount); // success\n     // old.refcount = 2\n   free_perf_ctx_data(cd1);\n\nThen later detach_global_ctx_data() will see the data but it's not\nmarked as global, so it won't call detach_task_ctx_data().","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98552","source_modified_at":"2026-10-19T09:21:35.261Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"506e64e710ff9573fd2b86686528762b7901b5e4","lessThan":"23250517cd475367653f1e99396967f54c6f1b7c","status":"affected","versionType":"git"},{"version":"506e64e710ff9573fd2b86686528762b7901b5e4","lessThan":"5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72","status":"affected","versionType":"git"},{"version":"506e64e710ff9573fd2b86686528762b7901b5e4","lessThan":"cca4980630b3c7a85f53cb43c6018184ce5d4e37","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98552","source_modified_at":"2026-10-19T09:21:35.261Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98552","source_modified_at":"2026-10-19T09:21:35.261Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"23250517cd475367653f1e99396967f54c6f1b7c","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98552","source_modified_at":"2026-10-19T09:21:35.261Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00198,"percentile":0.09055,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:18:19.810Z","modified_at":"2026-10-19T09:21:35.261Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98552","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:21:35.261Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98552","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/23250517cd475367653f1e99396967f54c6f1b7c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cca4980630b3c7a85f53cb43c6018184ce5d4e37"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:21:35.261Z","content_hash":"2d44ef207a15c7b90d3a250e023f17b17c374e2cd194f5415337a51d70f9a864"}}