CVE-2026-74729

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74729", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.929Z", "datePublished": "2026-08-22T15:33:19.037Z", "dateUpdated": "2026-10-30T12:30:24.911Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:30:24.911Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read\n\nput_fifo_with_discard() acts as both producer and consumer on the kfifo:\nit calls kfifo_skip() (advances out) and kfifo_put() (advances in) from\nthe IRQ handler without synchronizing with snoop_file_read(), which also\nconsumes via kfifo_to_user(). On SMP systems this concurrent access can\nleave (in - out) larger than the ring buffer, so __kfifo_to_user()'s clamp\nto (in - out) is ineffective and kfifo_copy_to_user() can attempt a\ncopy_to_user() past the kmalloc-2k backing store:\n\n usercopy: Kernel memory exposure attempt detected from SLUB object\n 'kmalloc-2k' (offset 0, size 2049)!\n kernel BUG at mm/usercopy.c!\n Call trace:\n usercopy_abort\n __check_heap_object\n __check_object_size\n kfifo_copy_to_user\n __kfifo_to_user\n snoop_file_read\n vfs_read\n\nSerialize kfifo access with a per-channel spinlock shared between the\nIRQ handler (producer) and the file reader (consumer). Annotate @fifo\nwith __guarded_by(&lock) and opt the driver into context analysis so the\ncompiler enforces that all fifo access holds the lock."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/soc/aspeed/Makefile", "drivers/soc/aspeed/aspeed-lpc-snoop.c"], "versions": [{"version": "3772e5da445420543b25825ac2b5971f3743f6e8", "lessThan": "f62afe827c52c300c64715631e6ac9e576c5112d", "status": "affected", "versionType": "git"}, {"version": "3772e5da445420543b25825ac2b5971f3743f6e8", "lessThan": "b87c0d24386ed5106feac12034fe09d893ccb469", "status": "affected", "versionType": "git"}, {"version": "3772e5da445420543b25825ac2b5971f3743f6e8", "lessThan": "afe2527eae0b51d5e8ddd77293afab3a5a1311a4", "status": "affected", "versionType": "git"}, {"version": "3772e5da445420543b25825ac2b5971f3743f6e8", "lessThan": "868c478abce858135db3eb65548a577e4b6747ac", "status": "affected", "versionType": "git"}, {"version": "3772e5da445420543b25825ac2b5971f3743f6e8", "lessThan": "131ab677b03349a5ae48da8722ec7075b37ec66e", "status": "affected", "versionType": "git"}, {"version": "3772e5da445420543b25825ac2b5971f3743f6e8", "lessThan": "1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f", "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/soc/aspeed/Makefile", "drivers/soc/aspeed/aspeed-lpc-snoop.c"], "versions": [{"version": "4.19", "status": "affected"}, {"version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "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": "4.19", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f62afe827c52c300c64715631e6ac9e576c5112d"}, {"url": "https://git.kernel.org/stable/c/b87c0d24386ed5106feac12034fe09d893ccb469"}, {"url": "https://git.kernel.org/stable/c/afe2527eae0b51d5e8ddd77293afab3a5a1311a4"}, {"url": "https://git.kernel.org/stable/c/868c478abce858135db3eb65548a577e4b6747ac"}, {"url": "https://git.kernel.org/stable/c/131ab677b03349a5ae48da8722ec7075b37ec66e"}, {"url": "https://git.kernel.org/stable/c/1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f"}], "title": "soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/soc/aspeed/Makefile", "drivers/soc/aspeed/aspeed-lpc-snoop.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f62afe827c52c300c64715631e6ac9e576c5112d", "status": "affected", "version": "3772e5da445420543b25825ac2b5971f3743f6e8", "versionType": "git"}, {"lessThan": "b87c0d24386ed5106feac12034fe09d893ccb469", "status": "affected", "version": "3772e5da445420543b25825ac2b5971f3743f6e8", "versionType": "git"}, {"lessThan": "afe2527eae0b51d5e8ddd77293afab3a5a1311a4", "status": "affected", "version": "3772e5da445420543b25825ac2b5971f3743f6e8", "versionType": "git"}, {"lessThan": "868c478abce858135db3eb65548a577e4b6747ac", "status": "affected", "version": "3772e5da445420543b25825ac2b5971f3743f6e8", "versionType": "git"}, {"lessThan": "131ab677b03349a5ae48da8722ec7075b37ec66e", "status": "affected", "version": "3772e5da445420543b25825ac2b5971f3743f6e8", "versionType": "git"}, {"lessThan": "1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f", "status": "affected", "version": "3772e5da445420543b25825ac2b5971f3743f6e8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/soc/aspeed/Makefile", "drivers/soc/aspeed/aspeed-lpc-snoop.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.19"}, {"lessThan": "4.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read\n\nput_fifo_with_discard() acts as both producer and consumer on the kfifo:\nit calls kfifo_skip() (advances out) and kfifo_put() (advances in) from\nthe IRQ handler without synchronizing with snoop_file_read(), which also\nconsumes via kfifo_to_user(). On SMP systems this concurrent access can\nleave (in - out) larger than the ring buffer, so __kfifo_to_user()'s clamp\nto (in - out) is ineffective and kfifo_copy_to_user() can attempt a\ncopy_to_user() past the kmalloc-2k backing store:\n\n usercopy: Kernel memory exposure attempt detected from SLUB object\n 'kmalloc-2k' (offset 0, size 2049)!\n kernel BUG at mm/usercopy.c!\n Call trace:\n usercopy_abort\n __check_heap_object\n __check_object_size\n kfifo_copy_to_user\n __kfifo_to_user\n snoop_file_read\n vfs_read\n\nSerialize kfifo access with a per-channel spinlock shared between the\nIRQ handler (producer) and the file reader (consumer). Annotate @fifo\nwith __guarded_by(&lock) and opt the driver into context analysis so the\ncompiler enforces that all fifo access holds the lock."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsoc: aspeed: lpc-snoop: Correcci\u00f3n de desbordamiento de usercopy en snoop_file_read\n\nput_fifo_with_discard() act\u00faa como productor y consumidor en el kfifo: llama a kfifo_skip() (avanza hacia afuera) y kfifo_put() (avanza hacia adentro) desde el gestor IRQ sin sincronizarse con snoop_file_read(), que tambi\u00e9n consume a trav\u00e9s de kfifo_to_user(). En sistemas SMP, este acceso concurrente puede dejar (in - out) mayor que el b\u00fafer de anillo, por lo que la limitaci\u00f3n de __kfifo_to_user() a (in - out) es ineficaz y kfifo_copy_to_user() puede intentar un copy_to_user() m\u00e1s all\u00e1 del almacenamiento de respaldo kmalloc-2k:\n\n usercopy: Intento de exposici\u00f3n de memoria del kernel detectado desde el objeto SLUB 'kmalloc-2k' (desplazamiento 0, tama\u00f1o 2049)!\n BUG del kernel en mm/usercopy.c!\n Traza de llamada:\n usercopy_abort\n __check_heap_object\n __check_object_size\n kfifo_copy_to_user\n __kfifo_to_user\n snoop_file_read\n vfs_read\n\nSerializar el acceso al kfifo con un spinlock por canal compartido entre el gestor IRQ (productor) y el lector de archivos (consumidor). Anotar @fifo con __guarded_by(&lock) y optar por incluir el controlador en el an\u00e1lisis de contexto para que el compilador imponga que todo acceso al fifo mantenga el bloqueo."}], "id": "CVE-2026-74729", "lastModified": "2026-10-30T13:20:04.977", "metrics": {}, "published": "2026-08-22T16:16:48.033", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/131ab677b03349a5ae48da8722ec7075b37ec66e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/868c478abce858135db3eb65548a577e4b6747ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/afe2527eae0b51d5e8ddd77293afab3a5a1311a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b87c0d24386ed5106feac12034fe09d893ccb469"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f62afe827c52c300c64715631e6ac9e576c5112d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read", "id": "2521359", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521359"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's Aspeed Low Pin Count (LPC) snoop driver. This vulnerability arises from a lack of synchronization during concurrent access to a kernel First-In, First-Out (kfifo) buffer. A local attacker could exploit this by triggering a race condition, leading to a usercopy overflow. This could result in kernel memory exposure, potentially disclosing sensitive information, and may also cause a system crash (Denial of Service)."], "name": "CVE-2026-74729", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74729\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74729\nhttps://lore.kernel.org/linux-cve-announce/2026082241-CVE-2026-74729-e31d@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3772e5da445420543b25825ac2b5971f3743f6e8,131ab677b03349a5ae48da8722ec7075b37ec66e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3772e5da445420543b25825ac2b5971f3743f6e8,1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T18:00:04.732484+00:00", "updated": "2026-08-24T20:00:04.402102+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}