CVE-2026-98951
Unknown
Description
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.
SeverityUnknown
CVSS—
Exploit probability—
Product
Linux
PublishedOct 23, 2026
First seenOct 23, 2026
How to fix
Update
- Linux Linux89fc70d73f4ac8781f9e15edd1dbc6b6088453b3, 59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97, 6.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 9300f00439743c4a34d735e1a27118eb68a1504e ≤ v < 89fc70d73f4ac8781f9e15edd1dbc6b6088453b3, 9300f00439743c4a34d735e1a27118eb68a1504e ≤ v < 59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97, f2a9cd050901c4734bc175294c3bd6a40a1a9e99, 6.5.3 ≤ v < 6.6, 6.6 | 89fc70d73f4ac8781f9e15edd1dbc6b6088453b3, 59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97, 6.6 |
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