CVE-2026-74734: firewire: ohci: fix NULL pointer dereference in ar_context_release
CSIRTS triage
- What
- NULL pointer dereference in the ar_context_release function of the firewire ohci driver.
- Who is affected
- Linux systems with FireWire controllers using the ohci driver.
- Urgency
- Medium severity (CVSS 5.5) and not exploited; apply next kernel update.
- Action
- Update Linux kernel to include the ohci ar_context_release NULL pointer check fix.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74734
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-747340.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-74734 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for firewire
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownCVE-2026-74734: In the Linux kernel, the following vulnerability has been resolved: firewire: ohci: fix NULL p…nvd · 2026-08-26
- criticalCVE-2026-68354: firewire: net: Fix fragmented datagram reassemblymsrc · 2026-08-11
- highCVE-2026-68354: In the Linux kernel, the following vulnerability has been resolved: firewire: net: Fix fragmen…nvd · 2026-08-10
- highCVE-2026-64483: ALSA: firewire: isight: bound the sample count to the packet payloadmsrc · 2026-08-06
- unknownCVE-2026-64483: In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire: isight: bo…nvd · 2026-07-25
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