{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80640", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.778Z", "datePublished": "2026-08-28T06:48:52.650Z", "dateUpdated": "2026-08-28T06:48:52.650Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-28T06:48:52.650Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/fwctl: Fix __fortify_panic\n\nFix a runtime assertion in cxlctl_get_supported_features(). Fortify\ncomplains that it is potentially overflowing the entries array per\n__counted_by_le(num_entries). Quiet the false positive by initializing\n@num_entries earlier.\n\n memcpy: detected buffer overflow: 48 byte write of buffer size 0\n WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398\n RIP: 0010:__fortify_report+0x50/0xa0\n Call Trace:\n __fortify_panic+0xd/0xf\n cxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/cxl/core/features.c"], "versions": [{"version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d", "lessThan": "b8d15e85596ad8993d42e0703a9741961a2f03eb", "status": "affected", "versionType": "git"}, {"version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d", "lessThan": "18c67ecc5dafe14055edcea53f36f4e31df1816b", "status": "affected", "versionType": "git"}, {"version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d", "lessThan": "6c9d2e87df40d606f1c85143e9acb1ecff463d5e", "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/features.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "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": "6.15", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b8d15e85596ad8993d42e0703a9741961a2f03eb"}, {"url": "https://git.kernel.org/stable/c/18c67ecc5dafe14055edcea53f36f4e31df1816b"}, {"url": "https://git.kernel.org/stable/c/6c9d2e87df40d606f1c85143e9acb1ecff463d5e"}], "title": "cxl/fwctl: Fix __fortify_panic", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/cxl/core/features.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b8d15e85596ad8993d42e0703a9741961a2f03eb", "status": "affected", "version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d", "versionType": "git"}, {"lessThan": "18c67ecc5dafe14055edcea53f36f4e31df1816b", "status": "affected", "version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d", "versionType": "git"}, {"lessThan": "6c9d2e87df40d606f1c85143e9acb1ecff463d5e", "status": "affected", "version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/cxl/core/features.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "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/fwctl: Fix __fortify_panic\n\nFix a runtime assertion in cxlctl_get_supported_features(). Fortify\ncomplains that it is potentially overflowing the entries array per\n__counted_by_le(num_entries). Quiet the false positive by initializing\n@num_entries earlier.\n\n memcpy: detected buffer overflow: 48 byte write of buffer size 0\n WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398\n RIP: 0010:__fortify_report+0x50/0xa0\n Call Trace:\n __fortify_panic+0xd/0xf\n cxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]"}], "id": "CVE-2026-80640", "lastModified": "2026-08-28T08:16:48.910", "metrics": {}, "published": "2026-08-28T08:16:48.910", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/18c67ecc5dafe14055edcea53f36f4e31df1816b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6c9d2e87df40d606f1c85143e9acb1ecff463d5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b8d15e85596ad8993d42e0703a9741961a2f03eb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: cxl/fwctl: Fix __fortify_panic", "id": "2525417", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525417"}, "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-120", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncxl/fwctl: Fix __fortify_panic\nFix a runtime assertion in cxlctl_get_supported_features(). Fortify\ncomplains that it is potentially overflowing the entries array per\n__counted_by_le(num_entries). Quiet the false positive by initializing\n@num_entries earlier.\nmemcpy: detected buffer overflow: 48 byte write of buffer size 0\nWARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398\nRIP: 0010:__fortify_report+0x50/0xa0\nCall Trace:\n__fortify_panic+0xd/0xf\ncxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]", "A flaw was found in the Linux kernel's CXL subsystem firmware control (`cxl/fwctl`). A buffer overflow vulnerability exists in the `cxlctl_get_supported_features()` function due to improper initialization of an array size. This could lead to a system crash, resulting in a denial of service (DoS)."], "name": "CVE-2026-80640", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80640\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80640\nhttps://lore.kernel.org/linux-cve-announce/2026082841-CVE-2026-80640-36d9@gregkh/T"], "threat_severity": "Low"}