i3c: master: svc: Prevent IRQ storm from false SLVSTART on NPCM845
Summary
| CVE | CVE-2026-97515 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-24 17:17:29 UTC |
| Updated | 2026-10-21 13:21:11 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001450000 probability, percentile 0.034150000 (date 2026-10-21)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 1ea4653cff35c29d1dd0b14ad9c8245e7318f337 335f72b1f9bbcf0f4cc5a505443b15f1af563b4f git | Not specified |
| CNA | Linux | Linux | affected 0430bf9bc1ac068c8b8c540eb93e5751872efc51 e9b139c4684ed8593a0b779ca02ea05f460b2eec git | Not specified |
| CNA | Linux | Linux | affected 0430bf9bc1ac068c8b8c540eb93e5751872efc51 1effa3adfe53cb2bb28bf5640a676b791d5ab405 git | Not specified |
| CNA | Linux | Linux | affected 30748ce7e156f221fb91689b338a0d7df77b732a git | Not specified |
| CNA | Linux | Linux | affected f2985a1de6f53abbc42c7a696ee6ba8bdecc9426 git | Not specified |
| CNA | Linux | Linux | affected 0541822045ae043d62c941ca31fa76871e436b5e git | Not specified |
| CNA | Linux | Linux | affected d231fb443d8d4042f0dd705b93beba8c916a7344 git | Not specified |
| CNA | Linux | Linux | affected 6.12.31 6.12.114 semver | Not specified |
| CNA | Linux | Linux | affected 5.15.185 5.16 semver | Not specified |
| CNA | Linux | Linux | affected 6.1.141 6.2 semver | Not specified |
| CNA | Linux | Linux | affected 6.6.93 6.7 semver | Not specified |
| CNA | Linux | Linux | affected 6.14.9 6.15 semver | Not specified |
| CNA | Linux | Linux | affected 6.15 | Not specified |
| CNA | Linux | Linux | unaffected 6.15 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.114 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.53 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/e9b139c4684ed8593a0b779ca02ea05f460b2eec | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1effa3adfe53cb2bb28bf5640a676b791d5ab405 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/335f72b1f9bbcf0f4cc5a505443b15f1af563b4f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.