{ "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" } } } }