Answer in brief
CVE-2026-98344 records a Unknown severity vulnerability in dmaengine: Fix device kref underflow in dma_chan_put(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8ad342a863590b24ce77681b7e081363fb3333f7 <036b527f92570206da4b8c40b38f8d689e29d0f3 || >=8ad342a863590b24ce77681b7e081363fb3333f7 <5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef || >=8ad342a863590b24ce77681b7e081363fb3333f7 <57f7f1c6827be7d8f80feca48d2125fb91c6f6ed || >=8ad342a863590b24ce77681b7e081363fb3333f7 <7c3f4ce651d43705f9ec7f778f642a90d5ff4fba || >=8ad342a863590b24ce77681b7e081363fb3333f7 <de2677e57d3161390d8a508f08cddec6ef7e4b23 || >=8ad342a863590b24ce77681b7e081363fb3333f7 <1a0d9b406febf23054ad595fd47b29325e70fb2d || >=8ad342a863590b24ce77681b7e081363fb3333f7 <77906ac448d2fa81fa710ae26c0e591ebdc81154 || >=8ad342a863590b24ce77681b7e081363fb3333f7 <44dab659064eb5c10adb0306510eebe848ed592d | 036b527f92570206da4b8c40b38f8d689e29d0f3, 5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef, 57f7f1c6827be7d8f80feca48d2125fb91c6f6ed, 7c3f4ce651d43705f9ec7f778f642a90d5ff4fba, de2677e57d3161390d8a508f08cddec6ef7e4b23, 1a0d9b406febf23054ad595fd47b29325e70fb2d, 77906ac448d2fa81fa710ae26c0e591ebdc81154, 44dab659064eb5c10adb0306510eebe848ed592d |
| Linux/Linuxgeneric | 5.6 | Not reported |
Published upstream
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 6, 2026
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.
Quoted source text, attributed separately from HOL analysis.