{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72476", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.934Z", "datePublished": "2026-08-15T05:57:16.396Z", "dateUpdated": "2026-08-17T05:44:40.606Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:40.606Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix possible use after free\n\nIn dma_release_channel(), check chan->device->privatecnt after call\ndma_chan_put(). However, dma_chan_put() call dma_device_put() which could\nrelease the last reference of the device if the DMA provider is already\ngone and hence free it.\n\nFixes it by moving dma_chan_put() after the check." } ], "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 flaw is in dma_release_channel() in drivers/dma/dmaengine.c, reached only when kernel client drivers release a privately requested DMA channel during probe/remove/error teardown triggered by local device access (e.g., /dev/iio:device*, /dev/snd/*, /dev/tty*, spidev), not from any network packet or remote protocol handler.\nAC:L - An attacker can hold a DMA slave channel open via a client device, then close it to call dma_release_channel(); when the DMA provider has already unregistered via unbind, hot-unplug, or module teardown, dma_chan_put() frees dma_device and the subsequent privatecnt access is a reliably triggerable UAF with attacker-controlled release timing.\nPR:L - Exploitation requires only a local unprivileged process able to open a device whose driver uses dma_request_chan() or dma_request_channel(); on embedded ADI FPGA, Android, and industrial platforms, non-root application users commonly have such device-node access without init-namespace root or CAP_SYS_ADMIN.\nUI:N - No victim interaction is required beyond the attacker opening, holding, and closing their own device handle or racing driver teardown; no other user must mount filesystems, approve prompts, or perform separate actions for exploitation to succeed.\nS:U - This is a kernel slab use-after-free in the dmaengine channel-release path affecting the same kernel security authority; it does not cross VM, IOMMU, container, or other sandbox boundaries and is standard in-kernel memory corruption rather than a scope change.\nC:H - After dma_chan_put() frees the last dma_device kref, the code reads and decrements privatecnt and may clear cap_mask on freed kmalloc memory; UAF on dma_device objects enables disclosure of attacker-influenced freed-heap contents per kernel UAF scoring guidance.\nI:H - Post-free modification of privatecnt and cap_mask corrupts reused slab objects under attacker influence, providing a plausible kernel heap corruption path toward arbitrary write primitives, control-flow hijacking, or local privilege escalation.\nA:H - Dereferencing freed dma_device memory during dma_release_channel() can cause KASAN slab-use-after-free reports, kernel oops, BUG, or panic; kernel guidance treats any use-after-free as high availability impact even when full exploitation is not demonstrated." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dma/dmaengine.c" ], "versions": [ { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "444f96066937f3fdf0e79b53289cff223c7d638b", "status": "affected", "versionType": "git" }, { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "ab438a9efb9042c79d2f8db28a326d55feb8591f", "status": "affected", "versionType": "git" }, { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce", "status": "affected", "versionType": "git" }, { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "5876f38b67a309c00628942cb25679749b53b397", "status": "affected", "versionType": "git" }, { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "3b0240483dc977dbec4f3bc7a5383d4691ecb625", "status": "affected", "versionType": "git" }, { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "329ec20a86091d2a6e5b4fe507545e7d678a22a2", "status": "affected", "versionType": "git" }, { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "0bc191050c3253da8ef4bfaf157c44efed6e22cd", "status": "affected", "versionType": "git" }, { "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00", "lessThan": "92f853f0645aebf1d05d333e97ab7c342ace1892", "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/dmaengine.c" ], "versions": [ { "version": "2.6.30", "status": "affected" }, { "version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "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": "2.6.30", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/444f96066937f3fdf0e79b53289cff223c7d638b" }, { "url": "https://git.kernel.org/stable/c/ab438a9efb9042c79d2f8db28a326d55feb8591f" }, { "url": "https://git.kernel.org/stable/c/9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce" }, { "url": "https://git.kernel.org/stable/c/5876f38b67a309c00628942cb25679749b53b397" }, { "url": "https://git.kernel.org/stable/c/3b0240483dc977dbec4f3bc7a5383d4691ecb625" }, { "url": "https://git.kernel.org/stable/c/329ec20a86091d2a6e5b4fe507545e7d678a22a2" }, { "url": "https://git.kernel.org/stable/c/0bc191050c3253da8ef4bfaf157c44efed6e22cd" }, { "url": "https://git.kernel.org/stable/c/92f853f0645aebf1d05d333e97ab7c342ace1892" } ], "title": "dmaengine: Fix possible use after free", "x_generator": { "engine": "bippy-1.2.0" } } } }