{"id":"DEBIAN-CVE-2022-50145","details":"In the Linux kernel, the following vulnerability has been resolved:  dmaengine: sf-pdma: Add multithread support for a DMA channel  When we get a DMA channel and try to use it in multiple threads it will cause oops and hanging the system.  % echo 64 \u003e /sys/module/dmatest/parameters/threads_per_chan % echo 10000 \u003e /sys/module/dmatest/parameters/iterations % echo 1 \u003e /sys/module/dmatest/parameters/run [   89.480664] Unable to handle kernel NULL pointer dereference at virtual                address 00000000000000a0 [   89.488725] Oops [#1] [   89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted                5.17.0-rc5 [   89.509385] epc : vchan_find_desc+0x32/0x46 [   89.513553]  ra : sf_pdma_tx_status+0xca/0xd6  This happens because of data race. Each thread rewrite channels's descriptor as soon as device_prep_dma_memcpy() is called. It leads to the situation when the driver thinks that it uses right descriptor that actually is freed or substituted for other one.  With current fixes a descriptor changes its value only when it has been used. A new descriptor is acquired from vc-\u003edesc_issued queue that is already filled with descriptors that are ready to be sent. Threads have no direct access to DMA channel descriptor. Now it is just possible to queue a descriptor for further processing.","modified":"2026-09-01T16:05:34.556492543Z","published":"2025-06-18T11:15:44.527Z","upstream":["CVE-2022-50145"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-50145"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50145.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50145.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50145.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}