{"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":"2026-09-08T08:44:16.241Z"},"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":"2026-09-08T08:44:16.241Z"},"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.6","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}]}]}}