{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50145", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.424Z", "datePublished": "2025-06-18T11:03:06.312Z", "dateUpdated": "2026-08-05T08:57:32.722Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:32.722Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: sf-pdma: Add multithread support for a DMA channel\n\nWhen we get a DMA channel and try to use it in multiple threads it\nwill cause oops and hanging the system.\n\n% echo 64 > /sys/module/dmatest/parameters/threads_per_chan\n% echo 10000 > /sys/module/dmatest/parameters/iterations\n% echo 1 > /sys/module/dmatest/parameters/run\n[ 89.480664] Unable to handle kernel NULL pointer dereference at virtual\n address 00000000000000a0\n[ 89.488725] Oops [#1]\n[ 89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted\n 5.17.0-rc5\n[ 89.509385] epc : vchan_find_desc+0x32/0x46\n[ 89.513553] ra : sf_pdma_tx_status+0xca/0xd6\n\nThis happens because of data race. Each thread rewrite channels's\ndescriptor as soon as device_prep_dma_memcpy() is called. It leads to the\nsituation when the driver thinks that it uses right descriptor that\nactually is freed or substituted for other one.\n\nWith current fixes a descriptor changes its value only when it has\nbeen used. A new descriptor is acquired from vc->desc_issued queue that\nis already filled with descriptors that are ready to be sent. Threads\nhave no direct access to DMA channel descriptor. Now it is just possible\nto queue a descriptor for further processing." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is in the SiFive/platform sf-pdma dmaengine driver and is reached only through local DMA channel operations (dmatest/sysfs or in-kernel DMA_MEMCPY clients such as async_tx), not via network packets or adjacent-link protocols.\nAC:L - The attacker can create the race by issuing concurrent transfers on the same channel (e.g. multiple dmatest threads or parallel async_tx/RAID memcpy submissions); both sides of the race are attacker-influenced, so success does not depend on conditions outside attacker control.\nPR:L - sf-pdma registers public DMA_MEMCPY channels (no DMA_PRIVATE), which async_tx and similar clients can share; concurrent I/O from an unprivileged local user can therefore hit the race without real root, so PR:L is the higher-severity defensible choice.\nUI:N - Exploitation requires only attacker-controlled concurrent DMA submissions; no separate victim action (mount, open, or admin confirmation) is needed.\nS:U - Impact is kernel descriptor UAF/corruption and DoS within the host kernel authority; it is not a VM escape or IOMMU boundary bypass.\nC:H - The race uses a descriptor that is freed or substituted for another transfer (commit: freed/substituted chan->desc), yielding a use-after-free/list-corruption primitive that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Descriptor substitution/UAF enables wrong DMA address programming and heap reuse/control-flow hijacking primitives typical of kernel use-after-free exploitation, so integrity impact is High.\nA:H - The bug causes a documented kernel NULL-pointer oops in vchan_find_desc/sf_pdma_tx_status and can hang the system under multi-threaded DMA load." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dma/sf-pdma/sf-pdma.c" ], "versions": [ { "version": "6973886ad58e6b4988813331abb76ae0b364a9c2", "lessThan": "b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11", "status": "affected", "versionType": "git" }, { "version": "6973886ad58e6b4988813331abb76ae0b364a9c2", "lessThan": "5ab2782c944e324008ef5d658f2494a9f0e3c5ac", "status": "affected", "versionType": "git" }, { "version": "6973886ad58e6b4988813331abb76ae0b364a9c2", "lessThan": "4c7350b1dd8a192af844de32fc99b9e34c876fda", "status": "affected", "versionType": "git" }, { "version": "6973886ad58e6b4988813331abb76ae0b364a9c2", "lessThan": "a93b3f1e11971a91b6441b6d47488f4492cc113f", "status": "affected", "versionType": "git" }, { "version": "6973886ad58e6b4988813331abb76ae0b364a9c2", "lessThan": "b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc", "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/sf-pdma/sf-pdma.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.137", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.61", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.18", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.2", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "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": "5.5", "versionEndExcluding": "5.10.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.61" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.18.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.19.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11" }, { "url": "https://git.kernel.org/stable/c/5ab2782c944e324008ef5d658f2494a9f0e3c5ac" }, { "url": "https://git.kernel.org/stable/c/4c7350b1dd8a192af844de32fc99b9e34c876fda" }, { "url": "https://git.kernel.org/stable/c/a93b3f1e11971a91b6441b6d47488f4492cc113f" }, { "url": "https://git.kernel.org/stable/c/b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc" } ], "title": "dmaengine: sf-pdma: Add multithread support for a DMA channel", "x_generator": { "engine": "bippy-1.2.0" } } } }