CVE-2026-98540

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98540", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.356Z", "datePublished": "2026-10-18T15:18:08.352Z", "dateUpdated": "2026-10-19T09:21:23.633Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:21:23.633Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfprobe: Terminate the fgraph_data list when the reservation is not filled\n\nfprobe_fgraph_entry() reserves shadow stack space for every fprobe with\nan exit handler, but only fills it for those whose entry handler returns\n0. fgraph_reserve_data() does not clear the area, so fprobe_return()\nparses the unused tail as headers left over from an earlier call, and an\nexit handler can run twice or despite its entry handler asking to skip\nit.\n\nWrite a zero word after the last entry to terminate the walk. A zeroed\nslot does not decode to a NULL fprobe on the arches that encode the\nheader into one unsigned long, since arch_decode_fprobe_header_fp() ORs\nin FPROBE_HEADER_MSB_PATTERN, so make read_fprobe_header() return NULL\nfor a zeroed slot."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/fprobe.c"], "versions": [{"version": "e0a384434ae1bdfb03954c46c464e3dbd3223ad6", "lessThan": "b7459fddcb27a4b7d01067678172afa362cf660d", "status": "affected", "versionType": "git"}, {"version": "e0a384434ae1bdfb03954c46c464e3dbd3223ad6", "lessThan": "1d653a183973f5283a3db5a38cd5e195eb152244", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/fprobe.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "7.1", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b7459fddcb27a4b7d01067678172afa362cf660d"}, {"url": "https://git.kernel.org/stable/c/1d653a183973f5283a3db5a38cd5e195eb152244"}], "title": "fprobe: Terminate the fgraph_data list when the reservation is not filled", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/fprobe.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b7459fddcb27a4b7d01067678172afa362cf660d", "status": "affected", "version": "e0a384434ae1bdfb03954c46c464e3dbd3223ad6", "versionType": "git"}, {"lessThan": "1d653a183973f5283a3db5a38cd5e195eb152244", "status": "affected", "version": "e0a384434ae1bdfb03954c46c464e3dbd3223ad6", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/fprobe.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nfprobe: Terminate the fgraph_data list when the reservation is not filled\n\nfprobe_fgraph_entry() reserves shadow stack space for every fprobe with\nan exit handler, but only fills it for those whose entry handler returns\n0. fgraph_reserve_data() does not clear the area, so fprobe_return()\nparses the unused tail as headers left over from an earlier call, and an\nexit handler can run twice or despite its entry handler asking to skip\nit.\n\nWrite a zero word after the last entry to terminate the walk. A zeroed\nslot does not decode to a NULL fprobe on the arches that encode the\nheader into one unsigned long, since arch_decode_fprobe_header_fp() ORs\nin FPROBE_HEADER_MSB_PATTERN, so make read_fprobe_header() return NULL\nfor a zeroed slot."}], "id": "CVE-2026-98540", "lastModified": "2026-10-19T10:19:09.837", "metrics": {}, "published": "2026-10-18T16:17:05.863", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1d653a183973f5283a3db5a38cd5e195eb152244"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b7459fddcb27a4b7d01067678172afa362cf660d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: fprobe: Terminate the fgraph_data list when the reservation is not filled", "id": "2554967", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2554967"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfprobe: Terminate the fgraph_data list when the reservation is not filled\nfprobe_fgraph_entry() reserves shadow stack space for every fprobe with\nan exit handler, but only fills it for those whose entry handler returns\n0. fgraph_reserve_data() does not clear the area, so fprobe_return()\nparses the unused tail as headers left over from an earlier call, and an\nexit handler can run twice or despite its entry handler asking to skip\nit.\nWrite a zero word after the last entry to terminate the walk. A zeroed\nslot does not decode to a NULL fprobe on the arches that encode the\nheader into one unsigned long, since arch_decode_fprobe_header_fp() ORs\nin FPROBE_HEADER_MSB_PATTERN, so make read_fprobe_header() return NULL\nfor a zeroed slot.", "A flaw was found in the Linux kernel's function probe (fprobe) tracing component. This vulnerability can result in a Denial of Service (DoS) due to improper memory initialization. When tracing kernel functions, unused shadow stack space is left uncleared, causing return routines to parse leftover data from earlier calls as valid headers. A local user with tracing privileges can trigger this issue to run probe exit handlers unexpectedly, leading to kernel instability or a system crash."], "name": "CVE-2026-98540", "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98540\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98540\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98540.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e0a384434ae1bdfb03954c46c464e3dbd3223ad6,b7459fddcb27a4b7d01067678172afa362cf660d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e0a384434ae1bdfb03954c46c464e3dbd3223ad6,1d653a183973f5283a3db5a38cd5e195eb152244)"}}], "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": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.9,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc5,*]"}}], "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": "2026-10-18T17:30:16.959318+00:00", "updated": "2026-10-23T07:30:09.340397+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}