Answer in brief
CVE-2026-98552 records a Unknown severity vulnerability in perf/core: Fix a refcount leak in attach_perf_ctx_data(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=506e64e710ff9573fd2b86686528762b7901b5e4 <23250517cd475367653f1e99396967f54c6f1b7c || >=506e64e710ff9573fd2b86686528762b7901b5e4 <5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72 || >=506e64e710ff9573fd2b86686528762b7901b5e4 <cca4980630b3c7a85f53cb43c6018184ce5d4e37 | 23250517cd475367653f1e99396967f54c6f1b7c, 5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72, cca4980630b3c7a85f53cb43c6018184ce5d4e37 |
| Linux/Linuxgeneric | 6.15 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix a refcount leak in attach_perf_ctx_data() The attach_perf_ctx_data() can race on global and !global cases. The global case is protected by global_ctx_data_rwsem and shares a single reference count using perf_ctx_data.global field. But when it races with !global case, it may miss to set the global field and result in a reference count leak. CPU1 CPU2 ---------------------------------------------------------------- attach_task_ctx_data(.global=1) attach_task_ctx_data(.global=0) cd1 = alloc_perf_ctx_data(); cd2 = alloc_perf_ctx_data(); // { .global = 0, .refcount = 1 }; try_cmpxchg(); // success, // task->perf_ctx_data = cd2 try_cmpxhg(); // fail; old = cd2 refcount_inc_not_zero(&old->refcount); // success // old.refcount = 2 free_perf_ctx_data(cd1); Then later detach_global_ctx_data() will see the data but it's not marked as global, so it won't call detach_task_ctx_data().
Quoted source text, attributed separately from HOL analysis.