i3c: master: svc: Prevent IRQ storm from false SLVSTART on NPCM845
In the Linux kernel, the following vulnerability has been resolved: i3c: master: svc: Prevent IRQ storm from false SLVSTART on NPCM845 On NPCM845, when a target on the I3C bus gets stuck holding SDA low, the controller reports a false Master Request (MR) in-band interrupt event. The driver handles this by emitting a STOP condition to restore the bus. However, the hardware quirk SVC_I3C_QUIRK_FALSE_SLVSTART indicates that emitting a STOP condition may spuriously set the SLVSTART interrupt status bit. In the Master Request case, this creates a feedback loop: the STOP triggers a new SLVSTART event, the IRQ handler fires again, the controller still reports an MR type, another STOP is emitted, and the cycle repeats indefinitely, resulting in an IRQ storm that can lock up the CPU. Clear the SLVSTART status bit explicitly after emitting the STOP in the Master Request IBI handler when the SVC_I3C_QUIRK_FALSE_SLVSTART quirk is set. This breaks the feedback loop without affecting normal SLVSTART processing, which is already guarded in the top-level IRQ handler by checking that MSTATUS is in SLVREQ state.
CVE-2026-97515
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-2026-97515
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": "1ea4653cff35c29d1dd0b14ad9c8245e7318f337",
"lessThan": "335f72b1f9bbcf0f4cc5a505443b15f1af563b4f",
"versionType": "git"
},
{
"status": "affected",
"version": "0430bf9bc1ac068c8b8c540eb93e5751872efc51",
"lessThan": "e9b139c4684ed8593a0b779ca02ea05f460b2eec",
"versionType": "git"
},
{
"status": "affected",
"version": "0430bf9bc1ac068c8b8c540eb93e5751872efc51",
"lessThan": "1effa3adfe53cb2bb28bf5640a676b791d5ab405",
"versionType": "git"
},
{
"status": "affected",
"version": "30748ce7e156f221fb91689b338a0d7df77b732a",
"versionType": "git"
},
{
"status": "affected",
"version": "f2985a1de6f53abbc42c7a696ee6ba8bdecc9426",
"versionType": "git"
},
{
"status": "affected",
"version": "0541822045ae043d62c941ca31fa76871e436b5e",
"versionType": "git"
},
{
"status": "affected",
"version": "d231fb443d8d4042f0dd705b93beba8c916a7344",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.31",
"lessThan": "6.12.114",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.185",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.141",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.93",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.14.9",
"lessThan": "6.15",
"versionType": "semver"
}
],
"programFiles": [
"drivers/i3c/master/svc-i3c-master.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/i3c/master/svc-i3c-master.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97515
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48770 · Revision 1
- Added to Heist Feed
- Publisher date