CVE-2026-98344dmaengine: Fix device kref underflow in dma_chan_put()
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 13 days later
· 13 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < 036b527f92570206da4b8c40b38f8d689e29d0f3
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < 5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < 57f7f1c6827be7d8f80feca48d2125fb91c6f6ed
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < 7c3f4ce651d43705f9ec7f778f642a90d5ff4fba
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < de2677e57d3161390d8a508f08cddec6ef7e4b23
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < 1a0d9b406febf23054ad595fd47b29325e70fb2d
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < 77906ac448d2fa81fa710ae26c0e591ebdc81154
- affected 8ad342a863590b24ce77681b7e081363fb3333f7 – < 44dab659064eb5c10adb0306510eebe848ed592d
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.54 – ≤ 6.18.*
- unaffected 7.2.8 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3 (opens in a new tab)
- https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef (opens in a new tab)
- https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed (opens in a new tab)
- https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba (opens in a new tab)
- https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23 (opens in a new tab)
- https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d (opens in a new tab)
- https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154 (opens in a new tab)
- https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-93329 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98344)Record last updated .