CVE-2026-98344
dmaengine: Fix device kref underflow in dma_chan_put()
No known exploitation. EPSS puts it in the 7th percentile. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- LinuxAffected: ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < 036b527f92570206da4b8c40b38f8d689e29d0f3Upgrade to: 036b527f92570206da4b8c40b38f8d689e29d0f3Affected: ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < 5fb1797a8c9485e40e5492fa0338ab5c7d1f3fefUpgrade to: 5fb1797a8c9485e40e5492fa0338ab5c7d1f3fefAffected: ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < 57f7f1c6827be7d8f80feca48d2125fb91c6f6edUpgrade to: 57f7f1c6827be7d8f80feca48d2125fb91c6f6edAffected: ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < 7c3f4ce651d43705f9ec7f778f642a90d5ff4fbaUpgrade to: 7c3f4ce651d43705f9ec7f778f642a90d5ff4fba + 4 more branchesStated by: CVE record
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
In the Linux kernel, the following vulnerability has been resolved: dmaengine: Fix device kref underflow in dma_chan_put() dma_chan_get() takes chan->device->ref only on the slow path: /* no kref on fast path */ if (chan->client_count) { __module_get(owner); chan->client_count++; return 0; } if (!try_module_get(owner)) return -ENODEV; if (!dma_device_get(chan->device)) { // calls kref_get_unless_zero() dma_chan_put() drops the ref unconditionally, so every fast-path get/put pair drops one extra device reference. The bug fires when two conditions hold together: a non-private provider has a persistent client holding chan->client_count > 0 and another client cycles dmaengine_get()/dmaengine_put(). When the kref hits zero, the subsequent dma_find_channel() returns NULL even though the provider module is still loaded. Fix this by dropping device->ref only on the last put, matching the single slow-path get.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.2% chance of exploitation activity in the next 30 days, which ranks it in the 7th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
2 events over 0 days, from the signal feeds we watch.
- Publishedrecord updated
Affected products
Sources
References in the record
- git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3
- git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef
- git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed
And 5 more references. See all after sign-in
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