mailbox: riscv-sbi-mpxy: validate RPMI notification lengths
In the Linux kernel, the following vulnerability has been resolved: mailbox: riscv-sbi-mpxy: validate RPMI notification lengths The SBI return value controls how many bytes are copied from shared memory into the RPMI notification buffer. It is not validated against the negotiated shared-memory size before that copy. The event walker also uses a reversed loop condition and can inspect a short event record. Validate the complete notification length before copying it, iterate only while a full event header remains, and stop when a declared event payload extends beyond the copied notification data.
CVE-2026-90191
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-2026-90191
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": "bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57",
"lessThan": "cbc24bce70dfd91c7b2f53b4fa896e9a4b6d6a6b",
"versionType": "git"
},
{
"status": "affected",
"version": "bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57",
"lessThan": "c7bc5e7677bcda7a446d63b989cfaa3fe91d6b76",
"versionType": "git"
},
{
"status": "affected",
"version": "bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57",
"lessThan": "11d5af151bcbe78f5a579e0faecd3be9cea0399a",
"versionType": "git"
}
],
"programFiles": [
"drivers/mailbox/riscv-sbi-mpxy-mbox.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/mailbox/riscv-sbi-mpxy-mbox.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90191
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36569 · Revision 1
- Added to Heist Feed
- Publisher date