{"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"}}}}