CVE-2026-97923

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97923", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:18:58.202Z", "datePublished": "2026-09-25T10:22:42.300Z", "dateUpdated": "2026-10-19T09:10:50.106Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:10:50.106Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Free histogram the var ref when its initialization fails\n\ncreate_var_ref() allocates a VAR_REF hist_field and then calls\ninit_var_ref() to fill it in. When that fails the field is leaked.\n\ncommit 656fe2ba85e8 (\"tracing: Use hist trigger's var_ref array to destroy\nvar_refs\") made destroy_hist_field() return early for\nHIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's\nvar_refs[] array instead. create_var_ref() adds the field to that array\nonly after init_var_ref() has succeeded, so on this path the field is in\nneither place and nothing frees it. The call was correct when it was\nwritten, before var refs were taken out of destroy_hist_field().\n\ninit_var_ref() cannot free it either. The caller owns the field, so\ninit_var_ref() undoes only its own string allocations and leaves the\nfield alone. Freeing it there would leave create_var_ref() passing freed\nmemory to destroy_hist_field(), which reads its flags.\n\nCall __destroy_hist_field(), which frees the field without consulting\nthe flag."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "608b7751926ec08fae6a1ac4e7308195da68c362", "status": "affected", "versionType": "git"}, {"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "4870f9071c9ea3c1423a07741b85a794db30d672", "status": "affected", "versionType": "git"}, {"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "352f84a381e7b4651b30366e93cb858f3fa9c91a", "status": "affected", "versionType": "git"}, {"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "4924328d6991f25b65bb7c8ff5d56c2a9b254851", "status": "affected", "versionType": "git"}, {"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "74375caa20fe5165807b4334c783d1790b01f02a", "status": "affected", "versionType": "git"}, {"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "222abcbe7866fef04563b6eb89fb21f627dcbc77", "status": "affected", "versionType": "git"}, {"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "a69baeac38677270656e85753d93856a076dee57", "status": "affected", "versionType": "git"}, {"version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "lessThan": "516001d53e6b2ea95a251ee2ef54a1a689a3fd58", "status": "affected", "versionType": "git"}, {"version": "836717841a30d7845cdf9cb806ee0ff3bfa7135a", "status": "affected", "versionType": "git"}, {"version": "4.19.100", "lessThan": "4.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "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": "5.0", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.100"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/608b7751926ec08fae6a1ac4e7308195da68c362"}, {"url": "https://git.kernel.org/stable/c/4870f9071c9ea3c1423a07741b85a794db30d672"}, {"url": "https://git.kernel.org/stable/c/352f84a381e7b4651b30366e93cb858f3fa9c91a"}, {"url": "https://git.kernel.org/stable/c/4924328d6991f25b65bb7c8ff5d56c2a9b254851"}, {"url": "https://git.kernel.org/stable/c/74375caa20fe5165807b4334c783d1790b01f02a"}, {"url": "https://git.kernel.org/stable/c/222abcbe7866fef04563b6eb89fb21f627dcbc77"}, {"url": "https://git.kernel.org/stable/c/a69baeac38677270656e85753d93856a076dee57"}, {"url": "https://git.kernel.org/stable/c/516001d53e6b2ea95a251ee2ef54a1a689a3fd58"}], "title": "tracing: Free histogram the var ref when its initialization fails", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/trace_events_hist.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "608b7751926ec08fae6a1ac4e7308195da68c362", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"lessThan": "4870f9071c9ea3c1423a07741b85a794db30d672", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"lessThan": "352f84a381e7b4651b30366e93cb858f3fa9c91a", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"lessThan": "4924328d6991f25b65bb7c8ff5d56c2a9b254851", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"lessThan": "74375caa20fe5165807b4334c783d1790b01f02a", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"lessThan": "222abcbe7866fef04563b6eb89fb21f627dcbc77", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"lessThan": "a69baeac38677270656e85753d93856a076dee57", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"lessThan": "516001d53e6b2ea95a251ee2ef54a1a689a3fd58", "status": "affected", "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2", "versionType": "git"}, {"status": "affected", "version": "836717841a30d7845cdf9cb806ee0ff3bfa7135a", "versionType": "git"}, {"lessThan": "4.20", "status": "affected", "version": "4.19.100", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/trace_events_hist.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"lessThan": "5.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "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\ntracing: Free histogram the var ref when its initialization fails\n\ncreate_var_ref() allocates a VAR_REF hist_field and then calls\ninit_var_ref() to fill it in. When that fails the field is leaked.\n\ncommit 656fe2ba85e8 (\"tracing: Use hist trigger's var_ref array to destroy\nvar_refs\") made destroy_hist_field() return early for\nHIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's\nvar_refs[] array instead. create_var_ref() adds the field to that array\nonly after init_var_ref() has succeeded, so on this path the field is in\nneither place and nothing frees it. The call was correct when it was\nwritten, before var refs were taken out of destroy_hist_field().\n\ninit_var_ref() cannot free it either. The caller owns the field, so\ninit_var_ref() undoes only its own string allocations and leaves the\nfield alone. Freeing it there would leave create_var_ref() passing freed\nmemory to destroy_hist_field(), which reads its flags.\n\nCall __destroy_hist_field(), which frees the field without consulting\nthe flag."}], "id": "CVE-2026-97923", "lastModified": "2026-10-19T10:17:43.060", "metrics": {}, "published": "2026-09-25T11:17:19.413", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/222abcbe7866fef04563b6eb89fb21f627dcbc77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/352f84a381e7b4651b30366e93cb858f3fa9c91a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4870f9071c9ea3c1423a07741b85a794db30d672"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4924328d6991f25b65bb7c8ff5d56c2a9b254851"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/516001d53e6b2ea95a251ee2ef54a1a689a3fd58"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/608b7751926ec08fae6a1ac4e7308195da68c362"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74375caa20fe5165807b4334c783d1790b01f02a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a69baeac38677270656e85753d93856a076dee57"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: tracing: Free histogram the var ref when its initialization fails", "id": "2541180", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541180"}, "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-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntracing: Free histogram the var ref when its initialization fails\ncreate_var_ref() allocates a VAR_REF hist_field and then calls\ninit_var_ref() to fill it in. When that fails the field is leaked.\ncommit 656fe2ba85e8 (\"tracing: Use hist trigger's var_ref array to destroy\nvar_refs\") made destroy_hist_field() return early for\nHIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's\nvar_refs[] array instead. create_var_ref() adds the field to that array\nonly after init_var_ref() has succeeded, so on this path the field is in\nneither place and nothing frees it. The call was correct when it was\nwritten, before var refs were taken out of destroy_hist_field().\ninit_var_ref() cannot free it either. The caller owns the field, so\ninit_var_ref() undoes only its own string allocations and leaves the\nfield alone. Freeing it there would leave create_var_ref() passing freed\nmemory to destroy_hist_field(), which reads its flags.\nCall __destroy_hist_field(), which frees the field without consulting\nthe flag.", "A flaw was found in the Linux kernel's tracing subsystem. When initialization of a histogram variable reference fails during trace event configuration, the allocated memory is not properly released. A local user with administrative or tracing privileges can exploit this vulnerability by repeatedly triggering failed setup operations, resulting in a memory leak that can cause a Denial of Service (DoS) through system resource exhaustion."], "name": "CVE-2026-97923", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97923\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97923\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97923.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[656fe2ba85e81d00e4447bf77b8da2be3c47acb2,74375caa20fe5165807b4334c783d1790b01f02a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[656fe2ba85e81d00e4447bf77b8da2be3c47acb2,222abcbe7866fef04563b6eb89fb21f627dcbc77)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[656fe2ba85e81d00e4447bf77b8da2be3c47acb2,a69baeac38677270656e85753d93856a076dee57)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[656fe2ba85e81d00e4447bf77b8da2be3c47acb2,516001d53e6b2ea95a251ee2ef54a1a689a3fd58)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "836717841a30d7845cdf9cb806ee0ff3bfa7135a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.19.100,4.20)"}}], "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": "5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*)"}}], "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": "2026-09-25T14:30:14.459695+00:00", "updated": "2026-10-01T08:45:03.650165+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}