{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72146", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.908Z", "datePublished": "2026-08-15T05:53:18.431Z", "dateUpdated": "2026-08-19T16:36:26.048Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:26.048Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: sh: rz-dmac: Move interrupt request after everything is set up\n\nOnce the interrupt is requested, the interrupt handler may run immediately.\nSince the IRQ handler can access channel->ch_base, which is initialized\nonly after requesting the IRQ, this may lead to invalid memory access.\nLikewise, the IRQ thread may access uninitialized data (the ld_free,\nld_queue, and ld_active lists), which may also lead to issues.\n\nRequest the interrupts only after everything is set up. To keep the error\npath simpler, use dmam_alloc_coherent() instead of dma_alloc_coherent()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw triggers in rz_dmac_chan_probe() during Renesas RZ/G2L/V2H/T2H platform DMAC driver initialization at boot or module load; there is no network, Bluetooth, or runtime syscall path to the vulnerable devm_request_threaded_irq() ordering.\nAC:L - Once the DMAC channel IRQ line is asserted when devm_request_threaded_irq() is called after reset_deassert, the hardirq/thread handlers run immediately before ch_base or lists are initialized; stale post-reset interrupt state on these SoCs makes this timing plausible without luck.\nPR:N - rz_dmac_probe() performs no capability or authentication checks before requesting per-channel IRQs; on affected Renesas embedded boards the vulnerable probe sequence runs automatically during kernel boot without the attacker holding Linux privileges.\nUI:N - No victim action is required; pending/latched DMAC channel interrupts during driver probe at boot or reboot can invoke the buggy handlers without anyone opening device nodes or configuring DMA transfers.\nS:U - Impact is kernel NULL dereference, list/spinlock corruption, and MMIO faults within the host kernel; this is not a VM escape, container sandbox breakout, or documented IOMMU security-boundary bypass.\nC:H - The threaded IRQ handler may lock an uninitialized vc.lock and walk uninitialized ld_active/ld_queue/ld_free lists, causing invalid kernel memory reads and list-metadata exposure beyond a pure bounded fault.\nI:H - The hardirq path issues readl/writel through uninitialized ch_base (NULL/low MMIO), and list/spinlock corruption in the IRQ thread can corrupt kernel heap metadata and enable control-flow hijack primitives.\nA:H - Invalid MMIO via NULL ch_base and corrupted IRQ-thread list handling can cause kernel oops/panic during probe on affected embedded systems, causing full loss of availability until reboot." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dma/sh/rz-dmac.c" ], "versions": [ { "version": "5000d37042a61ca556fde2782ca40dbfa802ea16", "lessThan": "d24d53323e817d79a4bd111bd10b34dbc96e64a8", "status": "affected", "versionType": "git" }, { "version": "5000d37042a61ca556fde2782ca40dbfa802ea16", "lessThan": "0e0c5b3cf374ebf3c589741751e1fbc67f53ec2f", "status": "affected", "versionType": "git" }, { "version": "5000d37042a61ca556fde2782ca40dbfa802ea16", "lessThan": "5b12de6229d662864ee22c11d4876652b40120f0", "status": "affected", "versionType": "git" }, { "version": "5000d37042a61ca556fde2782ca40dbfa802ea16", "lessThan": "2a4d9e2234c3f817bb0ddbc8680d09ce9be84f93", "status": "affected", "versionType": "git" }, { "version": "5000d37042a61ca556fde2782ca40dbfa802ea16", "lessThan": "ec9f66c91bffdb69d309bae6dfb387562db7ebc8", "status": "affected", "versionType": "git" }, { "version": "5000d37042a61ca556fde2782ca40dbfa802ea16", "lessThan": "07ae600bd353b22f31a8f1007269744fafc7f123", "status": "affected", "versionType": "git" }, { "version": "5000d37042a61ca556fde2782ca40dbfa802ea16", "lessThan": "731712403ddb39d1a76a11abf339a0615bc85de7", "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/sh/rz-dmac.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.15", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d24d53323e817d79a4bd111bd10b34dbc96e64a8" }, { "url": "https://git.kernel.org/stable/c/0e0c5b3cf374ebf3c589741751e1fbc67f53ec2f" }, { "url": "https://git.kernel.org/stable/c/5b12de6229d662864ee22c11d4876652b40120f0" }, { "url": "https://git.kernel.org/stable/c/2a4d9e2234c3f817bb0ddbc8680d09ce9be84f93" }, { "url": "https://git.kernel.org/stable/c/ec9f66c91bffdb69d309bae6dfb387562db7ebc8" }, { "url": "https://git.kernel.org/stable/c/07ae600bd353b22f31a8f1007269744fafc7f123" }, { "url": "https://git.kernel.org/stable/c/731712403ddb39d1a76a11abf339a0615bc85de7" } ], "title": "dmaengine: sh: rz-dmac: Move interrupt request after everything is set up", "x_generator": { "engine": "bippy-1.2.0" } } } }