{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63930","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.021Z","datePublished":"2026-07-19T14:55:30.016Z","dateUpdated":"2026-08-05T12:37:23.422Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:37:23.422Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: hw-consumer: fix use-after-free in error path\n\nIn the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code\nwas using list_for_each_entry() to iterate through buffers while calling\niio_buffer_put() which can free the current buffer if refcount drops to 0.\nThe list_for_each_entry() loop macro then evaluates buf->head.next to\ncontinue iteration, accessing the freed buffer.\n\nFix this by using list_for_each_entry_safe()."}],"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 code is only reached from kernel driver probe via `devm_iio_hw_consumer_alloc()` in the STM32 DFSDM ADC driver; there is no network, Bluetooth, or direct userspace syscall/ioctl path to `iio_hw_consumer_alloc()`.\nAC:L - Once on affected hardware, triggering the bug requires only causing `ENOMEM` during buffer setup (e.g., memory exhaustion) while probe or deferred-probe runs; the UAF is deterministic on that failure path and does not depend on winning a race or uncontrollable memory layout.\nPR:L - An unprivileged local user can exhaust system memory to force allocation failure during deferred-probe retries on embedded STM32 systems using legacy DFSDM bindings, without requiring init-namespace root or `CAP_SYS_MODULE`.\nUI:N - Exploitation does not require any victim user action such as mounting a filesystem or opening a file; memory pressure and kernel probe retries are sufficient.\nS:U - Impact is kernel heap memory corruption within the same kernel security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - The bug is a slab use-after-free where the cleanup loop dereferences `buf->head.next` after `iio_buffer_put()` frees the buffer object, enabling arbitrary kernel memory read primitives via heap grooming.\nI:H - Use-after-free on `hw_consumer_buffer` kmalloc objects can be leveraged for heap corruption and control-flow hijack to achieve arbitrary kernel write or code execution, not merely a bounded modification.\nA:H - The use-after-free dereference of freed list linkage commonly causes kernel oops/panic during the error cleanup path, and successful exploitation can fully compromise kernel availability."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/buffer/industrialio-hw-consumer.c"],"versions":[{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"b71893c57730809c222766e5718bb33610f11963","status":"affected","versionType":"git"},{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"2ff615fc455acda5425c4900160cbe11cfea4449","status":"affected","versionType":"git"},{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"d2759d49860b9a39b5cde2fb88e4b822ddf5f58f","status":"affected","versionType":"git"},{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"29783e6b6ec0b7152a15e53a063f17537e81177d","status":"affected","versionType":"git"},{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"e965627f0d442bfcae3f496c90cb653fb0917a61","status":"affected","versionType":"git"},{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"a3763ae33476328cf8d661742deb9daec78eac96","status":"affected","versionType":"git"},{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"9319c94f63ed10723afd738d79f5617daba87cc8","status":"affected","versionType":"git"},{"version":"48b66f8f936f369bb1a43c12aedbfeb2975baf4c","lessThan":"6f5ed4f2c7c83f33344e0ba179f72a12e5dad4a4","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/iio/buffer/industrialio-hw-consumer.c"],"versions":[{"version":"4.16","status":"affected"},{"version":"0","lessThan":"4.16","status":"unaffected","versionType":"semver"},{"version":"5.10.259","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.210","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.176","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.143","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.93","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.35","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.12","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","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":"4.16","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b71893c57730809c222766e5718bb33610f11963"},{"url":"https://git.kernel.org/stable/c/2ff615fc455acda5425c4900160cbe11cfea4449"},{"url":"https://git.kernel.org/stable/c/d2759d49860b9a39b5cde2fb88e4b822ddf5f58f"},{"url":"https://git.kernel.org/stable/c/29783e6b6ec0b7152a15e53a063f17537e81177d"},{"url":"https://git.kernel.org/stable/c/e965627f0d442bfcae3f496c90cb653fb0917a61"},{"url":"https://git.kernel.org/stable/c/a3763ae33476328cf8d661742deb9daec78eac96"},{"url":"https://git.kernel.org/stable/c/9319c94f63ed10723afd738d79f5617daba87cc8"},{"url":"https://git.kernel.org/stable/c/6f5ed4f2c7c83f33344e0ba179f72a12e5dad4a4"}],"title":"iio: buffer: hw-consumer: fix use-after-free in error path","x_generator":{"engine":"bippy-1.2.0"}}}}