{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-71221", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-02-14T16:26:02.969Z", "datePublished": "2026-02-14T16:27:04.631Z", "dateUpdated": "2026-08-05T12:12:33.785Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:12:33.785Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()\n\nAdd proper locking in mmp_pdma_residue() to prevent use-after-free when\naccessing descriptor list and descriptor contents.\n\nThe race occurs when multiple threads call tx_status() while the tasklet\non another CPU is freeing completed descriptors:\n\nCPU 0 CPU 1\n----- -----\nmmp_pdma_tx_status()\nmmp_pdma_residue()\n -> NO LOCK held\n list_for_each_entry(sw, ..)\n DMA interrupt\n dma_do_tasklet()\n -> spin_lock(&desc_lock)\n list_move(sw->node, ...)\n spin_unlock(&desc_lock)\n | dma_pool_free(sw) <- FREED!\n -> access sw->desc <- UAF!\n\nThis issue can be reproduced when running dmatest on the same channel with\nmultiple threads (threads_per_chan > 1).\n\nFix by protecting the chain_running list iteration and descriptor access\nwith the chan->desc_lock spinlock." } ], "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 vulnerable DMA status path is reached through local DMAengine clients or device operations, not directly through network packets or physical insertion.\nAC:L - An attacker can repeatedly issue concurrent non-cyclic transfers and status queries, controlling the workload that produces both descriptor completion and stale traversal without relying on an uncontrollable condition.\nPR:L - Although the demonstrated dmatest configuration is normally root-controlled, userspace-accessible DMA clients are reasonable on affected embedded deployments and the provider performs no capability check. Following the highest-severity rule, a basic local user is sufficient.\nUI:N - Exploitation requires no action by another user after the attacker initiates the concurrent DMA operations.\nS:U - The UAF compromises the same host kernel security authority; it does not inherently cross a guest-host, sandbox, or IOMMU boundary.\nC:H - The descriptor and list links are accessed after dma_pool_free() and may contain recycled attacker-influenced contents; under the required UAF guidance this has high confidentiality impact.\nI:H - The kernel UAF permits freed descriptor storage to be reclaimed while stale references remain, making heap manipulation and code-execution primitives defensible under the supplied scoring guidance.\nA:H - Freed or poisoned list pointers can be dereferenced during iteration, causing a kernel oops or panic, and the race can be triggered repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dma/mmp_pdma.c" ], "versions": [ { "version": "1b38da264674d6a0fe26a63996b8f88b88c3da48", "lessThan": "3f0e0e2d9e752570041e95fd04635e2580097819", "status": "affected", "versionType": "git" }, { "version": "1b38da264674d6a0fe26a63996b8f88b88c3da48", "lessThan": "dfb5e05227745de43b7fd589721817a4337c970d", "status": "affected", "versionType": "git" }, { "version": "1b38da264674d6a0fe26a63996b8f88b88c3da48", "lessThan": "eba0c75670c022cb1f948600db972524bcfe8166", "status": "affected", "versionType": "git" }, { "version": "1b38da264674d6a0fe26a63996b8f88b88c3da48", "lessThan": "fc023b8fab057f0c910856ff36d3e12a30b7af4a", "status": "affected", "versionType": "git" }, { "version": "1b38da264674d6a0fe26a63996b8f88b88c3da48", "lessThan": "9f665b3c3d9a168410251f27a5d019b7bf93185c", "status": "affected", "versionType": "git" }, { "version": "1b38da264674d6a0fe26a63996b8f88b88c3da48", "lessThan": "a143545855bc2c6e1330f6f57ae375ac44af00a7", "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/mmp_pdma.c" ], "versions": [ { "version": "3.16", "status": "affected" }, { "version": "0", "lessThan": "3.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.10", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "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": "3.16", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.18.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3f0e0e2d9e752570041e95fd04635e2580097819" }, { "url": "https://git.kernel.org/stable/c/dfb5e05227745de43b7fd589721817a4337c970d" }, { "url": "https://git.kernel.org/stable/c/eba0c75670c022cb1f948600db972524bcfe8166" }, { "url": "https://git.kernel.org/stable/c/fc023b8fab057f0c910856ff36d3e12a30b7af4a" }, { "url": "https://git.kernel.org/stable/c/9f665b3c3d9a168410251f27a5d019b7bf93185c" }, { "url": "https://git.kernel.org/stable/c/a143545855bc2c6e1330f6f57ae375ac44af00a7" } ], "title": "dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:45:00.180Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP 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