CVE-2026-74274

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74274", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.879Z", "datePublished": "2026-08-15T05:57:46.798Z", "dateUpdated": "2026-08-17T05:16:18.253Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:16:18.253Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/region: Fill first free targets[] slot during auto-discovery\n\nAny invalid endpoint decoder pointer in the target array of an active\nregion is not allowed by cxl driver. This means cxl driver always\nassumes the first p->nr_targets entries of the target array in an\nauto-assembly region are valid. However, there are scenarios that could\nleave NULL endpoint decoder pointer holes in the target array.\n\n1. When cxl_cancel_auto_attach() removes an endpoint decoder from a\n target array, the target slot is set to NULL. If the removed endpoint\n decoder is not the last element in the target array, the target array\n will contain a NULL hole.\n\n2. When a auto-assembly region removes an assigned endpoint decoder, if\n the removed endpoint decoder is not the last element in the target\n array, always remains a NULL hole in the target array.\n\nWhen a NULL pointer hole exists in a region's target array, it\nintroduces two potential problems:\n1. Access an endpoint decoder via a NULL pointer. it always trigger\n calltrace like that.\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI\n RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]\n Call Trace:\n <TASK>\n cxl_region_attach+0xc50/0x2140 [cxl_core]\n cxl_add_to_region+0x321/0x2330 [cxl_core]\n discover_region+0x92/0x150 [cxl_port]\n device_for_each_child+0xf3/0x170\n cxl_port_probe+0x150/0x200 [cxl_port]\n cxl_bus_probe+0x4f/0xa0 [cxl_core]\n really_probe+0x1c8/0x960\n __driver_probe_device+0x323/0x450\n driver_probe_device+0x45/0x120\n __device_attach_driver+0x15d/0x280\n bus_for_each_drv+0x10f/0x190\n\n2. Not having enough valid endpoint decoders attached to an\n auto-assembly region. if an auto-assembly region is created with lock\n flag or assigned endpoint decoder with lock flag, which means\n assigned endpoint decoder will not be reset during detaching, they\n could re-attach to the auto-assembly region again. But cxl region\n driver relies on p->nr_targets to verify whether the required number\n of endpoint decoders has been attached, and NULL endpoint decoder\n pointers are still counted in that case.\n\nTo fix above issues, adjust cxl_region_attach_auto() logic to find the\nfirst free target slot for endpoint decoder attachment, this ensures\nNULL holes in the target array are filled, rather than adding new\nendpoint decoders at the tail of the target array."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/cxl/core/region.c"], "versions": [{"version": "2230c4bdc4120417799c74326ade3123da226d54", "lessThan": "6fde3fcdfec438ba0df26e25a8ac7c3707211799", "status": "affected", "versionType": "git"}, {"version": "2230c4bdc4120417799c74326ade3123da226d54", "lessThan": "aa8a76711c15041ec1e42c3a74c15c2df0bd31f6", "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/cxl/core/region.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "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": "6.19", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6fde3fcdfec438ba0df26e25a8ac7c3707211799"}, {"url": "https://git.kernel.org/stable/c/aa8a76711c15041ec1e42c3a74c15c2df0bd31f6"}], "title": "cxl/region: Fill first free targets[] slot during auto-discovery", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/cxl/core/region.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6fde3fcdfec438ba0df26e25a8ac7c3707211799", "status": "affected", "version": "2230c4bdc4120417799c74326ade3123da226d54", "versionType": "git"}, {"lessThan": "aa8a76711c15041ec1e42c3a74c15c2df0bd31f6", "status": "affected", "version": "2230c4bdc4120417799c74326ade3123da226d54", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/cxl/core/region.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "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\ncxl/region: Fill first free targets[] slot during auto-discovery\n\nAny invalid endpoint decoder pointer in the target array of an active\nregion is not allowed by cxl driver. This means cxl driver always\nassumes the first p->nr_targets entries of the target array in an\nauto-assembly region are valid. However, there are scenarios that could\nleave NULL endpoint decoder pointer holes in the target array.\n\n1. When cxl_cancel_auto_attach() removes an endpoint decoder from a\n target array, the target slot is set to NULL. If the removed endpoint\n decoder is not the last element in the target array, the target array\n will contain a NULL hole.\n\n2. When a auto-assembly region removes an assigned endpoint decoder, if\n the removed endpoint decoder is not the last element in the target\n array, always remains a NULL hole in the target array.\n\nWhen a NULL pointer hole exists in a region's target array, it\nintroduces two potential problems:\n1. Access an endpoint decoder via a NULL pointer. it always trigger\n calltrace like that.\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI\n RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]\n Call Trace:\n <TASK>\n cxl_region_attach+0xc50/0x2140 [cxl_core]\n cxl_add_to_region+0x321/0x2330 [cxl_core]\n discover_region+0x92/0x150 [cxl_port]\n device_for_each_child+0xf3/0x170\n cxl_port_probe+0x150/0x200 [cxl_port]\n cxl_bus_probe+0x4f/0xa0 [cxl_core]\n really_probe+0x1c8/0x960\n __driver_probe_device+0x323/0x450\n driver_probe_device+0x45/0x120\n __device_attach_driver+0x15d/0x280\n bus_for_each_drv+0x10f/0x190\n\n2. Not having enough valid endpoint decoders attached to an\n auto-assembly region. if an auto-assembly region is created with lock\n flag or assigned endpoint decoder with lock flag, which means\n assigned endpoint decoder will not be reset during detaching, they\n could re-attach to the auto-assembly region again. But cxl region\n driver relies on p->nr_targets to verify whether the required number\n of endpoint decoders has been attached, and NULL endpoint decoder\n pointers are still counted in that case.\n\nTo fix above issues, adjust cxl_region_attach_auto() logic to find the\nfirst free target slot for endpoint decoder attachment, this ensures\nNULL holes in the target array are filled, rather than adding new\nendpoint decoders at the tail of the target array."}], "id": "CVE-2026-74274", "lastModified": "2026-08-17T06:19:21.097", "metrics": {}, "published": "2026-08-15T06:22:26.793", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6fde3fcdfec438ba0df26e25a8ac7c3707211799"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aa8a76711c15041ec1e42c3a74c15c2df0bd31f6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: cxl/region: Fill first free targets[] slot during auto-discovery", "id": "2516838", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516838"}, "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-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncxl/region: Fill first free targets[] slot during auto-discovery\nAny invalid endpoint decoder pointer in the target array of an active\nregion is not allowed by cxl driver. This means cxl driver always\nassumes the first p->nr_targets entries of the target array in an\nauto-assembly region are valid. However, there are scenarios that could\nleave NULL endpoint decoder pointer holes in the target array.\n1. When cxl_cancel_auto_attach() removes an endpoint decoder from a\ntarget array, the target slot is set to NULL. If the removed endpoint\ndecoder is not the last element in the target array, the target array\nwill contain a NULL hole.\n2. When a auto-assembly region removes an assigned endpoint decoder, if\nthe removed endpoint decoder is not the last element in the target\narray, always remains a NULL hole in the target array.\nWhen a NULL pointer hole exists in a region's target array, it\nintroduces two potential problems:\n1. Access an endpoint decoder via a NULL pointer. it always trigger\ncalltrace like that.\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI\nRIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]\nCall Trace:\n<TASK>\ncxl_region_attach+0xc50/0x2140 [cxl_core]\ncxl_add_to_region+0x321/0x2330 [cxl_core]\ndiscover_region+0x92/0x150 [cxl_port]\ndevice_for_each_child+0xf3/0x170\ncxl_port_probe+0x150/0x200 [cxl_port]\ncxl_bus_probe+0x4f/0xa0 [cxl_core]\nreally_probe+0x1c8/0x960\n__driver_probe_device+0x323/0x450\ndriver_probe_device+0x45/0x120\n__device_attach_driver+0x15d/0x280\nbus_for_each_drv+0x10f/0x190\n2. Not having enough valid endpoint decoders attached to an\nauto-assembly region. if an auto-assembly region is created with lock\nflag or assigned endpoint decoder with lock flag, which means\nassigned endpoint decoder will not be reset during detaching, they\ncould re-attach to the auto-assembly region again. But cxl region\ndriver relies on p->nr_targets to verify whether the required number\nof endpoint decoders has been attached, and NULL endpoint decoder\npointers are still counted in that case.\nTo fix above issues, adjust cxl_region_attach_auto() logic to find the\nfirst free target slot for endpoint decoder attachment, this ensures\nNULL holes in the target array are filled, rather than adding new\nendpoint decoders at the tail of the target array.", "A flaw was found in the Linux kernel's CXL (Compute Express Link) driver. When endpoint decoders are removed from a CXL region's target array, the driver can fail to properly fill the resulting NULL pointer holes. This can lead to the system attempting to access a NULL pointer, causing a general protection fault and a system crash. This vulnerability could result in a Denial of Service (DoS)."], "name": "CVE-2026-74274", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74274\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74274\nhttps://lore.kernel.org/linux-cve-announce/2026081544-CVE-2026-74274-9e24@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2230c4bdc4120417799c74326ade3123da226d54,6fde3fcdfec438ba0df26e25a8ac7c3707211799)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2230c4bdc4120417799c74326ade3123da226d54,aa8a76711c15041ec1e42c3a74c15c2df0bd31f6)"}}], "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": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T18:30:12.329335+00:00", "updated": "2026-08-22T02:15:03.753235+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}