{"id":"CVE-2026-98344","revision":"bc6043db03ea44a7a440e8d9c8bd13df","records":[{"revision":"bc6043db03ea44a7a440e8d9c8bd13df","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98344","aliases":[],"title":"dmaengine: Fix device kref underflow in dma_chan_put()","description":"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.","state":0,"publishedAt":"2026-10-06T08:46:33.997+00:00","modifiedAt":"2026-10-19T09:17:55.263+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/dma/dmaengine.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"036b527f92570206da4b8c40b38f8d689e29d0f3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"57f7f1c6827be7d8f80feca48d2125fb91c6f6ed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"7c3f4ce651d43705f9ec7f778f642a90d5ff4fba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"de2677e57d3161390d8a508f08cddec6ef7e4b23\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"1a0d9b406febf23054ad595fd47b29325e70fb2d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"77906ac448d2fa81fa710ae26c0e591ebdc81154\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ad342a863590b24ce77681b7e081363fb3333f7\",\n                            \"lessThan\": \"44dab659064eb5c10adb0306510eebe848ed592d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/dma/dmaengine.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.54\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3","https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef","https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed","https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba","https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23","https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d","https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154","https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98344","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98344","identifiers":["CVE-2026-98344"]},"retained":false,"historicalAffected":[]}],"coverage":[]}