CVE-2026-89940
CVE-2026-89940 is a security vulnerability. O3 Security confirms whether CVE-2026-89940 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
In the Linux kernel, the following vulnerability has been resolved: iio: buffer: Tie IIO dma fence lock lifetime to the fence The `iio_dma_fence` implementation currently uses a lock…
Description
In the Linux kernel, the following vulnerability has been resolved:
iio: buffer: Tie IIO dma fence lock lifetime to the fence
The iio_dma_fence implementation currently uses a lock embedded in the
iio_dmabuf_priv. But the iio_dma_fence can outlive the
iio_dmabuf_priv, which can cause a use-after-free.
Tie the lifetime of the lock to the lifetime of the fence by embedding them in the same struct.
We can't just hold a reference to the iio_dmabuf_priv from the
iio_dma_fence since iio_buffer_dmabuf_release() might sleep and the
fence release callback is not allowed to sleep.
Note that the dma_fence framework now has an internal lock that gets used
when the passing NULL for lock in dma_fence_init(), but in order to
allow this patch to be backportable use an external lock.
Detection & mitigation playbook
VulnerabilityDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for the affected component. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of the affected component has shipped for CVE-2026-89940 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2026-89940 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2026-89940. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-89940 in your dependencies?
O3 detects CVE-2026-89940 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.