CVE-2026-74355
VT-d iommu RB-tree corruption in Linux kernel causing kernel memory corruption/crash
Is CVE-2026-74355 being exploited?
Not confirmed. CVE-2026-74355 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.13% probability of exploitation in the next 30 days.
How severe is CVE-2026-74355?
CVE-2026-74355 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-74355?
Yes. A fix has been recorded for CVE-2026-74355. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74355 affect?
CVE-2026-74355 affects Linux kernel (iommu/vt-d), Systems using Intel VT-d (IOMMU), Virtualization hosts with VT-d enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74355?
Install vendor/kernel update with VT-d fix and reboot affected systems ASAP
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Device probe error can corrupt kernel RB-tree leading to memory corruption, kernel crashes and potential local privilege escalation via driver misuse.
Patch when possible
- affected>= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 and < f5102e0fc3c6dc8685549891a96e4589fdb3e211
- affected>= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 and < d16923a45d4d08367650fdc3451c89299ab6ac5a
- affected>= 4f1492efb495bcef34c9ee8a94af81e6cea5abf4 and < 43bd9e6d5513cb1edbafdeef146a1edc3aaced56
- affected6.15
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.