{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98344","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.343Z","datePublished":"2026-10-06T08:46:33.997Z","dateUpdated":"2026-10-06T08:46:33.997Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-06T08:46:33.997Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix device kref underflow in dma_chan_put()\n\ndma_chan_get() takes chan->device->ref only on the slow path:\n\n\t/* no kref on fast path */\n\tif (chan->client_count) {\n\t\t__module_get(owner);\n\t\tchan->client_count++;\n\t\treturn 0;\n\t}\n\tif (!try_module_get(owner))\n\t\treturn -ENODEV;\n\tif (!dma_device_get(chan->device)) { // calls kref_get_unless_zero()\n\ndma_chan_put() drops the ref unconditionally, so every fast-path\nget/put pair drops one extra device reference.\n\nThe bug fires when two conditions hold together: a non-private\nprovider has a persistent client holding chan->client_count > 0\nand another client cycles dmaengine_get()/dmaengine_put().\nWhen the kref hits zero, the subsequent dma_find_channel() returns\nNULL even though the provider module is still loaded.\n\nFix this by dropping device->ref only on the last put, matching the\nsingle slow-path get."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"],"versions":[{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"036b527f92570206da4b8c40b38f8d689e29d0f3","status":"affected","versionType":"git"},{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef","status":"affected","versionType":"git"},{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"57f7f1c6827be7d8f80feca48d2125fb91c6f6ed","status":"affected","versionType":"git"},{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"7c3f4ce651d43705f9ec7f778f642a90d5ff4fba","status":"affected","versionType":"git"},{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"de2677e57d3161390d8a508f08cddec6ef7e4b23","status":"affected","versionType":"git"},{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"1a0d9b406febf23054ad595fd47b29325e70fb2d","status":"affected","versionType":"git"},{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"77906ac448d2fa81fa710ae26c0e591ebdc81154","status":"affected","versionType":"git"},{"version":"8ad342a863590b24ce77681b7e081363fb3333f7","lessThan":"44dab659064eb5c10adb0306510eebe848ed592d","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"],"versions":[{"version":"5.6","status":"affected"},{"version":"0","lessThan":"5.6","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc4","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.3-rc4"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3"},{"url":"https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef"},{"url":"https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed"},{"url":"https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba"},{"url":"https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23"},{"url":"https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d"},{"url":"https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154"},{"url":"https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d"}],"title":"dmaengine: Fix device kref underflow in dma_chan_put()","x_generator":{"engine":"bippy-1.2.0"}}}}