riscv: ptrace: Zero-initialize regset buffers before copyin
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.
CVE-2026-98951
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98951
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "9300f00439743c4a34d735e1a27118eb68a1504e",
"lessThan": "89fc70d73f4ac8781f9e15edd1dbc6b6088453b3",
"versionType": "git"
},
{
"status": "affected",
"version": "9300f00439743c4a34d735e1a27118eb68a1504e",
"lessThan": "59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97",
"versionType": "git"
},
{
"status": "affected",
"version": "f2a9cd050901c4734bc175294c3bd6a40a1a9e99",
"versionType": "git"
},
{
"status": "affected",
"version": "6.5.3",
"lessThan": "6.6",
"versionType": "semver"
}
],
"programFiles": [
"arch/riscv/kernel/ptrace.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/riscv/kernel/ptrace.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98951
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #52806 · Revision 1
- Added to Heist Feed
- Publisher date