Answer in brief
CVE-2026-98951 records a Unknown severity vulnerability in riscv: ptrace: Zero-initialize regset buffers before copyin. 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 | >=9300f00439743c4a34d735e1a27118eb68a1504e <89fc70d73f4ac8781f9e15edd1dbc6b6088453b3 || >=9300f00439743c4a34d735e1a27118eb68a1504e <59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97 || f2a9cd050901c4734bc175294c3bd6a40a1a9e99 || >=6.5.3 <6.6 | 89fc70d73f4ac8781f9e15edd1dbc6b6088453b3, 59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97, 6.6 |
| Linux/Linuxgeneric | 6.6 | Not reported |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
In the Linux kernel, the following vulnerability has been resolved: riscv: ptrace: Zero-initialize regset buffers before copyin user_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET request with a short iov_len leaves the rest of the stack buffer uninitialized. In riscv_vr_set() that garbage is validated and copied into the target's vstate, and in riscv_cfi_set() it can be stored as the target's shadow stack pointer. Zero both buffers, as the get path already does.
Quoted source text, attributed separately from HOL analysis.